TTL and DMX output circuit and controller

Abstract

The utility model discloses a TTL and DMX output circuit and a controller. The TTL and DMX output circuit comprises a TTL and DMX generation sub-circuit, a plurality of selection sub-circuits, an amplification sub-circuit and an output sub-circuit, a plurality of control ends of the TTL and DMX generation sub-circuit are respectively connected with controlled ends of the selection sub-circuits, and a plurality of first output ends of the TTL and DMX generation sub-circuit are respectively connected with first input ends of the selection sub-circuits; a plurality of second output ends of the TTL and DMX generation sub-circuit are respectively connected with second input ends of the selection sub-circuits; the output end of each selection sub-circuit is connected with the corresponding input end of the amplification sub-circuit; and the output end of the amplification sub-circuit is connected with the input end of the output sub-circuit. According to the utility model, the TTL and DMX signal generation and output functions are integrated in the same circuit, so that the requirements of various devices can be flexibly met.

Description

Technical Field

[0001] The utility model relates to the field of LED control, in particular to a TTL and DMX output circuit and a controller. Background Art

[0002] In stage lighting control, some fixtures may only support DMX signals, while others may support TTL signals. Existing technologies often require specific devices designed for specific signal types. For example, some fixtures only support DMX signals, while others may only support TTL signals. Due to incompatibility between signal types between devices, users may need to purchase additional converters or adapters to convert between different signal types, which not only increases costs but may also affect overall system performance. For control systems that need to support multiple signal types, corresponding adjustments and support must also be made at the software level, which increases the difficulty of software development and maintenance. Utility Model Content

[0003] The embodiments of the present invention provide a TTL and DMX output circuit and controller, which can flexibly adapt to the needs of various devices by integrating the generation and output functions of TTL and DMX signals in the same circuit without replacing hardware or rewiring.

[0004] To achieve the above-mentioned object, a first aspect of an embodiment of the present application provides a TTL and DMX output circuit, comprising a TTL and DMX generation subcircuit, a plurality of selection subcircuits, an amplification subcircuit, and an output subcircuit;

[0005] The multiple control terminals of the TTL and DMX generation subcircuit are respectively connected to the controlled terminals of the respective selection subcircuits; the multiple first output terminals of the TTL and DMX generation subcircuit are respectively connected to the first input terminals of the respective selection subcircuits; the multiple second output terminals of the TTL and DMX generation subcircuit are respectively connected to the second input terminals of the respective selection subcircuits; each first output terminal outputs TTL data, and each second output terminal outputs DMX data; the output terminal of each selection subcircuit is connected to the corresponding input terminal of the amplification subcircuit; and the output terminal of the amplification subcircuit is connected to the input terminal of the output subcircuit.

[0006] In a possible implementation, the selection sub-circuit includes a selection sub-chip and a first resistor;

[0007] The controlled end of the selection sub-chip is connected to one end of the first resistor, the first input end of the selection sub-chip is connected to the corresponding first output end of the TTL and DMX generation sub-circuit, the second input end of the selection sub-chip is connected to the corresponding second output end of the TTL and DMX generation sub-circuit, and the output end of the selection sub-chip is connected to the input end of the amplification sub-circuit; the other end of the first resistor is connected to the corresponding control end of the TTL and DMX generation sub-circuit.

[0008] In a possible implementation, the model of the selection sub-chip is CH443K.

[0009] In a possible implementation, the amplifying sub-circuit includes an amplifying sub-chip and a plurality of second resistors; the total number of the second resistors is equal to the total number of the selecting sub-circuits;

[0010] Several output ends of the amplifier sub-chip are respectively connected to one end of the corresponding second resistor, and the other end of the second resistor is connected to the corresponding input end of the output sub-circuit; several input ends of the amplifier sub-chip are respectively connected to the output end of the corresponding selection sub-circuit.

[0011] In a possible implementation, the amplifier sub-chip is of model 74HC245.

[0012] In a possible implementation, the output subcircuit includes a power module, a pin header, and a plurality of output interfaces;

[0013] The input end of the power module is connected to the power end of the pin header; several input ends of the pin header are respectively connected to the corresponding output ends of the amplifying sub-circuit, and several output ends of the pin header are respectively connected to the corresponding output interfaces; each output interface corresponds to an input end of the pin header.

[0014] In a possible implementation, the power module includes a field effect transistor, a third resistor, a transistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a polarized capacitor, and a capacitor;

[0015] The drain of the field effect tube is connected to the power supply end of the pin header, the source of the field effect tube is connected to the first external power supply, the gate of the field effect tube is connected to one end of the third resistor, and the gate of the field effect tube is connected to the collector of the transistor;

[0016] The other end of the third resistor is connected to the first external power supply;

[0017] The base of the transistor is connected to one end of the fourth resistor, the base of the transistor is connected to one end of the fifth resistor, the base of the transistor is connected to one end of the sixth resistor, the base of the transistor is connected to one end of the seventh resistor, the base of the transistor is connected to the positive electrode of the polarized capacitor, and the base of the transistor is connected to one end of the capacitor;

[0018] The other end of the fifth resistor is connected to the second external power supply;

[0019] The other end of the sixth resistor is connected to the first power control end;

[0020] The other end of the seventh resistor is connected to the second power supply control end;

[0021] The other end of the fourth resistor, the negative electrode of the polarized capacitor, and the other end of the capacitor are all grounded.

[0022] In a possible implementation, the field effect transistor is an enhancement mode P-channel field effect transistor.

[0023] In a possible implementation, the transistor is an NPN transistor.

[0024] A first aspect of an embodiment of the present application provides a TTL and DMX output controller, comprising a TTL and DMX output circuit as described above.

[0025] Compared to the prior art, the embodiment of the present invention provides a TTL and DMX output circuit and controller that can flexibly adapt to the needs of various devices by integrating the generation and output functions of TTL and DMX signals in one circuit without replacing hardware or rewiring. Among them, by selecting a sub-circuit, it is possible to select and switch between TTL signals and DMX signals, which simplifies the conversion process between signal types and improves the flexibility of the system. The design of the amplification sub-circuit enhances the driving capability of the signal, ensures the quality and integrity of the signal during transmission, and is suitable for long-distance transmission. The design of the power module takes into account the need for stable power supply and may include protection mechanisms such as overload protection. The use of the present invention can improve the reliability and stability of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a connection diagram of a TTL and DMX output circuit provided by an embodiment of the present invention;

[0027] Figure 2 This is a connection diagram of a selection sub-circuit provided by an embodiment of the present utility model;

[0028] Figure 3This is a connection diagram of an amplifier sub-circuit provided by an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of an output sub-circuit connection provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] To solve the above problem, see Figure 1 An embodiment of the present invention provides a TTL and DMX output circuit, including a TTL and DMX generation sub-circuit 1, a plurality of selection sub-circuits 2, an amplification sub-circuit 3 and an output sub-circuit 4.

[0032] The multiple control terminals of the TTL and DMX generation subcircuit 1 are respectively connected to the controlled terminals of the respective selection subcircuits 2; the multiple first output terminals of the TTL and DMX generation subcircuit 1 are respectively connected to the first input terminals of the respective selection subcircuits 2; the multiple second output terminals of the TTL and DMX generation subcircuit 1 are respectively connected to the second input terminals of the respective selection subcircuits 2; each first output terminal outputs TTL data, and each second output terminal outputs DMX data; each output terminal of the selection subcircuit 2 is connected to the corresponding input terminal of the amplification subcircuit 3; and the output terminal of the amplification subcircuit 3 is connected to the input terminal of the output subcircuit 4.

[0033] The TTL and DMX generation subcircuit 1 can generate both TTL and DMX digital signals. It has several control terminals, a first output terminal, and a second output terminal. The control terminals are used to control the selection subcircuit 2. The first output terminal outputs TTL data, and the second output terminal outputs DMX data.

[0034] The selection sub-circuit 2 selects and outputs a TTL or DMX signal based on the control signal. Each selection sub-circuit 2 has a controlled terminal, a first input terminal, and a second input terminal. The controlled terminal receives the control signal from the TTL and DMX generation sub-circuit 1, the first input terminal receives TTL data, and the second input terminal receives DMX data. The output terminal of the selection sub-circuit 2 is connected to the amplification sub-circuit 3.

[0035] The amplifier sub-circuit 3 amplifies the selected signal to enhance the signal's driving capability and transmission distance. Each amplifier sub-circuit 3 has an input and an output. The input is connected to the output of the selection sub-circuit 2, and the output is connected to the output sub-circuit 4.

[0036] The output sub-circuit 4 is responsible for outputting the amplified signal to an external device.

[0037] The TTL and DMX generation subcircuit 1 generates TTL or DMX signals as needed and sends a control signal to the selection subcircuit 2 via the control terminal. Based on the received control signal, the selection subcircuit 2 selects the TTL or DMX signal for output. The logic within the selection subcircuit 2 (e.g., using a CH443K multiplexer chip) determines which input signal is selected. The amplification subcircuit 3 (e.g., using a 74HC245 as a buffer / driver chip) receives the signal output from the selection subcircuit 2 and amplifies it to ensure that the signal is not attenuated during transmission. Finally, the output subcircuit 4 transmits the amplified signal to an external device via the pin header and output interface.

[0038] This embodiment integrates TTL and DMX signal generation capabilities, avoiding device incompatibility issues caused by signal type mismatches. Users can switch output signal types by simply changing a control signal, eliminating the need to manually modify hardware connections, simplifying the operation process. The addition of amplification subcircuit 3 ensures that the signal maintains sufficient strength during transmission, making it suitable for long-distance transmission.

[0039] Through the above design, the circuit can effectively solve the problems of device compatibility and control system flexibility existing in the existing technology, and provide a more flexible, efficient and easy-to-use lighting signal output solution.

[0040] See also Figure 2 The selection sub-circuit 2 includes a selection sub-chip U1 and a first resistor R18.

[0041] The controlled end of the selection sub-chip U1 is connected to one end of the first resistor R18, the first input end of the selection sub-chip U1 is connected to the corresponding first output end of the TTL and DMX generation sub-circuit 1, the second input end of the selection sub-chip U1 is connected to the corresponding second output end of the TTL and DMX generation sub-circuit 1, and the output end of the selection sub-chip U1 is connected to the input end of the amplification sub-circuit 3; the other end of the first resistor R18 is connected to the corresponding control end of the TTL and DMX generation sub-circuit 1.

[0042] Exemplarily, the model of the selection sub-chip U1 is CH443K.

[0043] It should be noted that the first input terminal of the selection sub-chip U1 is connected to the corresponding first output terminal of the TTL and DMX generation sub-circuit 1 to receive TTL data. The second input terminal of the selection sub-chip U1 is connected to the corresponding second output terminal of the TTL and DMX generation sub-circuit 1 to receive DMX data. The output terminal of the selection sub-chip U1 is connected to the input terminal of the amplification sub-circuit 3 to output the selected signal (TTL or DMX).

[0044] When the TTL and DMX generation sub-circuit 1 generates a control signal and transmits it to the selection sub-chip U1 through the first resistor R18, the selection sub-chip U1 selects whether to receive the signal from the first input terminal or the second input terminal based on the control signal. If the control signal indicates that a TTL signal should be output, the selection sub-chip U1 receives the signal from the first input terminal and outputs it through its output terminal. If the control signal indicates that a DMX signal should be output, the selection sub-chip U1 receives the signal from the second input terminal and outputs it through its output terminal.

[0045] The signal output by the selection sub-chip U1 is transmitted to the input end of the amplification sub-circuit 3 through its output end.

[0046] Assume that the model of the selector chip U1 is CH443K, which is a commonly used multiplexer chip that can realize the selection and output of multiple input signals. Specifically:

[0047] The CH443K has multiple input terminals, an output terminal, and a control terminal. When the control terminal receives a specific signal, it can select one of the input terminals as the input signal source. The first resistor R18 provides a stable reference voltage to ensure that the control signal can accurately select the input signal.

[0048] Through the above design, selection subcircuit 2 enables flexible switching between TTL and DMX signals. This approach not only simplifies hardware design but also improves system flexibility and reliability. Users can select the desired output signal type through a simple control signal, without the need for complex hardware replacement or rewiring. This design is particularly suitable for applications that require rapid switching between different signal types, such as stage lighting control systems and audio equipment, and can significantly improve the system's usability and scalability.

[0049] For example, see Figure 3 The amplifying sub-circuit includes an amplifying sub-chip and a plurality of second resistors; the total number of the second resistors is equal to the total number of the selecting sub-circuits.

[0050] Several output ends of the amplifier sub-chip are respectively connected to one end of the corresponding second resistor, and the other end of the second resistor is connected to the corresponding input end of the output sub-circuit; several input ends of the amplifier sub-chip are respectively connected to the output end of the corresponding selection sub-circuit.

[0051] Exemplarily, the model of the amplifier sub-chip is 74HC245.

[0052] The multiple input terminals of the amplifier sub-chip are connected to the output terminals of the corresponding selection sub-circuits. This means that each selection sub-circuit has a corresponding input terminal of the amplifier sub-chip connected to it. The multiple output terminals of the amplifier sub-chip are connected to one end of the corresponding second resistor. The other end of the second resistor is connected to the corresponding input terminal of the output sub-circuit.

[0053] When the selection sub-circuit 2 selects a TTL or DMX signal and transmits it to the amplifier sub-chip through its output terminal, the amplifier sub-chip (such as 74HC245) amplifies the received signal. The amplified signal is output through the output terminal of the amplifier sub-chip and transmitted to the output sub-circuit 4 through the second resistor.

[0054] The second resistor acts as a load matcher, ensuring that the signal is not distorted during transmission. It also acts as a signal isolation resistor, preventing the load of the output sub-circuit from directly affecting the operating state of the amplification sub-circuit.

[0055] Assume the amplifier chip is a 74HC245, a commonly used bidirectional buffer / driver chip that amplifies and isolates signals. Specifically, the 74HC245 has multiple inputs, multiple outputs, and a direction control terminal. The input receives the signal from the selection subcircuit. The output transmits the amplified signal to the second resistor.

[0056] For example, see Figure 4 The output sub-circuit 4 includes a power module 40, a pin header CN2 and a plurality of output interfaces DA.

[0057] The input end of the power module 40 is connected to the power end of the needle header CN2; several input ends (D0′-D7′) of the needle header CN2 are respectively connected to the corresponding output ends of the amplifying sub-circuit 3, and several output ends of the needle header CN2 are respectively connected to the corresponding output interfaces DA; each output interface DA corresponds to an input end of the needle header CN2.

[0058] The power module 40 provides a stable power source for the entire system, ensuring the proper functioning of all components. The power module's design incorporates features such as overload protection, enhancing system reliability. The signal amplified by the amplifier subcircuit 3 enters through the input terminals (D0′-D7′) of the pin header CN2. The signal is transmitted through the output terminals of the pin header CN2 to the corresponding output interface DA. Ultimately, the signal is output to an external device through the output interface DA.

[0059] Output subcircuit 4 achieves stable output of the amplified signal and provides reliable power management. This approach not only improves signal transmission reliability but also simplifies the overall system design, making signal output more flexible and efficient. This design is particularly suitable for applications requiring stable power and reliable signal output, such as stage lighting control systems and audio equipment, significantly improving system reliability and performance.

[0060] Illustratively, the power module 40 includes a field effect transistor Q1, a third resistor R2, a transistor Q2, a fourth resistor R6, a fifth resistor R104, a sixth resistor R102, a seventh resistor R5, a polarized capacitor E8, and a capacitor C6.

[0061] The drain of the field effect transistor Q1 is connected to the power supply end of the needle header CN2, the source of the field effect transistor Q1 is connected to the first external power supply, the gate of the field effect transistor Q1 is connected to one end of the third resistor R2, and the gate of the field effect transistor Q1 is connected to the collector of the transistor Q2.

[0062] The other end of the third resistor R2 is connected to the first external power source.

[0063] The base of the transistor Q2 is connected to one end of the fourth resistor R6, the base of the transistor Q2 is connected to one end of the fifth resistor R104, the base of the transistor Q2 is connected to one end of the sixth resistor R102, the base of the transistor Q2 is connected to one end of the seventh resistor R5, the base of the transistor Q2 is connected to the positive electrode of the polarized capacitor E8, and the base of the transistor Q2 is connected to one end of the capacitor C6.

[0064] The other end of the fifth resistor R104 is connected to the second external power supply.

[0065] The other end of the sixth resistor R102 is connected to the first power control end.

[0066] The other end of the seventh resistor R5 is connected to the second power control end.

[0067] The other end of the fourth resistor R6 , the negative electrode of the polarized capacitor E8 , and the other end of the capacitor C6 are all grounded.

[0068] Exemplarily, the field effect transistor Q1 is an enhancement mode P-channel field effect transistor.

[0069] Exemplarily, the transistor Q2 is an NPN transistor.

[0070] FET Q1 acts as a power switch, with its gate controlled by the collector of transistor Q2. When transistor Q2 is on, the gate of FET Q1 is low, turning FET Q1 on, and power flows through the source of FET Q1 to the power supply terminal of pin header CN2. When FET Q2 is off, the gate of FET Q1 is high, turning FET Q1 off and shutting off power. FET Q2 acts as a signal amplifier, with its base receiving a control signal. The fourth resistor R6, the fifth resistor R104, the sixth resistor R102, and the seventh resistor R5 provide voltage division and current limiting. The emitter of FET Q2 is grounded, and its collector is connected to the gate of FET Q1, thereby controlling the on / off state of FET Q1.

[0071] The polarized capacitor E8 and capacitor C6 are used to filter and smooth the power supply voltage to ensure the stability of the power supply. It should be noted that if capacitor C6 is a smoothing capacitor, the stability effect will be better.

[0072] The sixth resistor R102 is connected to the first power control terminal for receiving a control signal. The seventh resistor R5 is connected to the second power control terminal for receiving a control signal. These two control terminals can control the state of the transistor Q2, thereby controlling the conduction or cutoff of the field effect transistor Q1.

[0073] The fifth resistor R104 is connected to a second external power source to provide a bias current for the transistor Q2.

[0074] Through the above design, power module 40 achieves stable power control and filtering, ensuring system reliability throughout operation. This approach not only improves power management efficiency but also simplifies the overall system design, making the power supply more stable and controllable. This design is particularly suitable for applications requiring a stable power supply, such as stage lighting control systems and audio equipment, and can significantly improve system reliability and performance.

[0075] In summary, this integrated TTL and DMX output circuit design solves the problems of power management, signal transmission distance and signal quality existing in the prior art through the cooperation of the power module 40, the pin header CN2 and the output interface DA, and provides a more flexible, efficient and easy-to-use signal output solution.

[0076] Compared to the prior art, the TTL and DMX output circuit provided by the embodiment of the present invention can flexibly adapt to the needs of various devices by integrating the generation and output functions of TTL and DMX signals in one circuit without replacing hardware or rewiring. Among them, by selecting a sub-circuit, it is possible to select and switch between TTL signals and DMX signals, which simplifies the conversion process between signal types and improves the flexibility of the system. The design of the amplification sub-circuit enhances the driving capability of the signal, ensures the quality and integrity of the signal during transmission, and is suitable for long-distance transmission. The design of the power module takes into account the need for stable power supply and may include protection mechanisms such as overload protection. The use of the present invention can improve the reliability and stability of the control system.

[0077] An embodiment of the present application provides a TTL and DMX output controller, including the TTL and DMX output circuit described above.

[0078] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the controller described above can refer to the corresponding process in the aforementioned circuit embodiment and will not be described again here.

[0079] Compared to the prior art, the TTL and DMX output controller provided by the embodiment of the present invention can flexibly adapt to the needs of various devices by integrating the generation and output functions of TTL and DMX signals in one circuit without replacing hardware or rewiring. Among them, by selecting a sub-circuit, it is possible to select and switch between TTL signals and DMX signals, which simplifies the conversion process between signal types and improves the flexibility of the system. The design of the amplification sub-circuit enhances the driving capability of the signal, ensures the quality and integrity of the signal during transmission, and is suitable for long-distance transmission. The design of the power module takes into account the need for stable power supply and may include protection mechanisms such as overload protection. The use of the present invention can improve the reliability and stability of the control system.

[0080] An embodiment of the present application provides a TTL and DMX output device, including a TTL and DMX output controller as described above.

[0081] Since the output device can adopt the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0082] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A TTL and DMX output circuit, characterized in that, include: TTL and DMX generation sub-circuit, several selection sub-circuits, amplification sub-circuit and output sub-circuit; The multiple control terminals of the TTL and DMX generation subcircuit are respectively connected to the controlled terminals of the respective selection subcircuits; the multiple first output terminals of the TTL and DMX generation subcircuit are respectively connected to the first input terminals of the respective selection subcircuits; the multiple second output terminals of the TTL and DMX generation subcircuit are respectively connected to the second input terminals of the respective selection subcircuits; each first output terminal outputs TTL data, and each second output terminal outputs DMX data; the output terminal of each selection subcircuit is connected to the corresponding input terminal of the amplification subcircuit; and the output terminal of the amplification subcircuit is connected to the input terminal of the output subcircuit.

2. A TTL and DMX output circuit as claimed in claim 1, characterized in that: The selection sub-circuit includes a selection sub-chip and a first resistor; The controlled end of the selection sub-chip is connected to one end of the first resistor, the first input end of the selection sub-chip is connected to the corresponding first output end of the TTL and DMX generation sub-circuit, the second input end of the selection sub-chip is connected to the corresponding second output end of the TTL and DMX generation sub-circuit, and the output end of the selection sub-chip is connected to the input end of the amplification sub-circuit; the other end of the first resistor is connected to the corresponding control end of the TTL and DMX generation sub-circuit.

3. A TTL and DMX output circuit as claimed in claim 2, characterized in that: The model of the selection sub-chip is CH443K.

4. A TTL and DMX output circuit as claimed in claim 1, characterized in that: The amplifying sub-circuit includes an amplifying sub-chip and a plurality of second resistors; the total number of the second resistors is equal to the total number of the selecting sub-circuits; Several output ends of the amplifier sub-chip are respectively connected to one end of the corresponding second resistor, and the other end of the second resistor is connected to the corresponding input end of the output sub-circuit; several input ends of the amplifier sub-chip are respectively connected to the output end of the corresponding selection sub-circuit.

5. A TTL and DMX output circuit as claimed in claim 4, characterized in that: The model of the amplifier chip is 74HC245.

6. A TTL and DMX output circuit as claimed in claim 1, characterized in that: The output subcircuit includes a power supply module, a pin header and a plurality of output interfaces; The input end of the power module is connected to the power end of the pin header; several input ends of the pin header are respectively connected to the corresponding output ends of the amplifying sub-circuit, and several output ends of the pin header are respectively connected to the corresponding output interfaces; each output interface corresponds to an input end of the pin header.

7. A TTL and DMX output circuit as claimed in claim 6, characterized in that: The power supply module includes a field effect tube, a third resistor, a triode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a polarized capacitor and a capacitor; The drain of the field effect tube is connected to the power supply end of the pin header, the source of the field effect tube is connected to the first external power supply, the gate of the field effect tube is connected to one end of the third resistor, and the gate of the field effect tube is connected to the collector of the transistor; The other end of the third resistor is connected to the first external power supply; The base of the transistor is connected to one end of the fourth resistor, the base of the transistor is connected to one end of the fifth resistor, the base of the transistor is connected to one end of the sixth resistor, the base of the transistor is connected to one end of the seventh resistor, the base of the transistor is connected to the positive electrode of the polarized capacitor, and the base of the transistor is connected to one end of the capacitor; The other end of the fifth resistor is connected to the second external power supply; The other end of the sixth resistor is connected to the first power control end; The other end of the seventh resistor is connected to the second power supply control end; The other end of the fourth resistor, the negative electrode of the polarized capacitor, and the other end of the capacitor are all grounded.

8. A TTL and DMX output circuit as claimed in claim 7, characterized in that: The field effect transistor is an enhanced P-channel field effect transistor.

9. A TTL and DMX output circuit as claimed in claim 7, characterized in that: The transistor is an NPN transistor.

10. A TTL and DMX output controller, characterized in that, The invention comprises a TTL and DMX output circuit as claimed in any one of claims 1 to 9.

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