A switch circuit test board

Abstract

The utility model belongs to the field of test circuit provides a kind of switch circuit test edition, including connector and multiple test circuits, connector is used to with the plug-in connection of measured circuit, it has the output pin of multiple output switch signals, the pin of multiple output switch signals is different respectively in test circuit, multiple test circuits all include first test unit and second test unit, first test unit includes first triode and buzzer, the B pole of first triode is connected with output pin, its E pole is grounded, its C pole is connected with buzzer negative pole, second test unit includes second triode and LED, the B pole of second triode is connected to the same output pin with first triode, the E pole of second triode is grounded, its C pole is connected with the negative pole of LED, the buzzer of multiple test circuits is all powered by DC power supply, the anode of the LED of multiple test circuits is all connected to the same power chip;The utility model can solve the problem that the electric signal detection result of precision integrated circuit in the prior art is not intuitive enough.

Description

Technical Field

[0001] This utility model relates to the field of test circuits, and in particular to a test board for a switching circuit. Background Technology

[0002] Precision integrated circuits are generally inspected using visual, optical, and electrical signal testing methods to confirm circuit quality. However, visual and optical methods have limitations and cannot detect the internal flow of the circuit. Existing electrical signal testing methods require instruments such as oscilloscopes, and the results are not intuitive enough. Utility Model Content

[0003] In view of the above technical problems, this utility model provides a switch circuit test board to solve the problem that the electrical signal detection results of precision integrated circuits in the prior art are not intuitive enough.

[0004] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0005] This utility model discloses a switch circuit test board, including a connector and multiple test circuits. The connector is used for plugging and connecting with the circuit under test and has multiple output pins for outputting switch signals. The multiple pins for outputting the switch signals are respectively connected to different test circuits. Each of the multiple test circuits includes a first test unit and a second test unit. The first test unit includes a first transistor and a buzzer. The base (B) of the first transistor is connected to the output pin, its emitter (E) is grounded, and its collector (C) is connected to the negative terminal of the buzzer. The second test unit includes a second transistor and an LED. The base (B) of the second transistor and the first transistor are connected to the same output pin. The emitter (E) of the second transistor is grounded, and its collector (C) is connected to the negative terminal of the LED. The buzzers of the multiple test circuits are all powered by a DC power supply, and the positive terminals of the LEDs of the multiple test circuits are all connected to the same power chip.

[0006] Furthermore, the first test unit further includes a first current-limiting resistor, and the second test unit further includes a second current-limiting resistor. The first current-limiting resistor is connected between the base (B) of the first transistor and the connector, and the second current-limiting resistor is connected between the base (B) of the second transistor and the connector.

[0007] Furthermore, the positive terminal of the buzzer is also connected to the negative terminal of the protection diode, and its negative terminal is connected to the positive terminal of the protection diode.

[0008] Furthermore, the power chip has filter capacitors at both its input and output terminals.

[0009] The technical solution disclosed herein has the following beneficial effects:

[0010] This invention addresses the shortcomings of existing technologies that require manual and optical inspection for precision circuits, as well as the lack of intuitiveness in electrical signal detection results. It provides a low-cost, highly operable, intuitive, and stable testing solution. Attached Figure Description

[0011] Figure 1 This is a circuit schematic diagram of the test version of the switching circuit in the embodiments of this specification. Detailed Implementation

[0012] The exemplary implementation will now be described more fully with reference to the accompanying drawings.

[0013] The accompanying drawings are merely illustrative of this disclosure. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It is understood that the scale of the various components in the drawings does not constitute a limitation of this disclosure.

[0014] like Figure 1 As shown in the embodiment of this specification, a switch circuit test board is provided, including a connector J1 and multiple test circuits 1. The connector J1 is used to connect to the circuit under test J1 and has multiple output pins 3 to 6 for output switch signals. The pins of the multiple output switch signals are respectively connected to different test circuits 1. Each of the multiple test circuits 1 includes a first test unit and a second test unit. The first test unit includes a first transistor Q1 and a buzzer H1. The base (B) of the first transistor Q1 is connected to the output pin of the connector J1, its emitter (E) is grounded, and its collector (C) is connected to the negative terminal of the buzzer H1. The second test unit includes a second transistor Q2 and an LED. The base (B) of the second transistor Q2 and the first transistor Q1 are connected to the same output pin. The emitter (E) of the second transistor Q2 is grounded, and its collector (C) is connected to the negative terminal of the LED. The buzzers H1 of the multiple test circuits 1 are all powered by a DC power supply, and the positive terminals of the LEDs of the multiple test circuits 1 are all connected to the same power chip Q9.

[0015] The first test unit also includes a first current-limiting resistor R1, and the second test unit also includes a second current-limiting resistor R2. The first current-limiting resistor R1 is connected between the base of the first transistor Q1 and the connector J1, and the second current-limiting resistor R2 is connected between the base of the second transistor Q2 and the connector J1.

[0016] The positive terminal of buzzer H1 is also connected to the negative terminal of protection diode D5, and its negative terminal is connected to the positive terminal of protection diode D5.

[0017] The power chip Q9 has filter capacitors at both its input and output terminals.

[0018] Operating Principle: Connector J1 uses a BM25-4S connector as an example for signal conversion. Pins 3-6 are the output pins for the switch signal, pins 1 / 2 / 7 / 8 are high-level, and the remaining pins are either NC or ground. The circuit design is such that a single high-level conduction of the switch signal indicates "on," and disconnection indicates "off." The test board is connected to the circuit board under test via a BM25-4S connector J1. Pin 4 is connected in series with the first current-limiting resistor R1 and the second current-limiting resistor R2, leading to the first and second test units. The first transistor Q1 and the second transistor Q2 have different power ratings, hence the different values ​​of the current-limiting resistors used. Buzzer H1 is powered by a 5V DC power supply, or a 3.7V lithium battery. Buzzer H1 is directly driven by a 5V DC power supply and connected to a surge protection diode D5. The LED uses a 5V to 2.5V DC power chip Q9 as its input power.

[0019] During operation, the signals from the circuit board under test are transferred to the test board via connector J1. The switch circuit under test is manually switched on and off; the LED indicator lights up or off, and the buzzer sounds or stops. Each switch circuit corresponds to one indicator light signal. If, during manual testing and the switch is closed, the LED does not light up and the buzzer does not sound, the switch circuit under test is considered open. If, during manual testing and the switch is closed, both LEDs light up and the buzzer does not sound, the switch circuit is considered short-circuited.

[0020] Beneficial effects:

[0021] This invention addresses the shortcomings of existing technologies that require manual and optical inspection for precision circuits, as well as the lack of intuitiveness in electrical signal detection results. It provides a low-cost, highly operable, intuitive, and stable testing solution.

[0022] Finally, it is worth explaining that, due to space limitations, Figure 1 Only one buzzer is shown, but in reality, the first transistor of each first test unit is connected to a buzzer, which is powered by a DC power supply.

[0023] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A test board for a switching circuit, characterized in that, The device includes a connector and multiple test circuits. The connector is used for plugging and connecting with the circuit under test and has multiple output pins for outputting switch signals. The multiple pins for outputting the switch signals are respectively connected to different test circuits. Each of the multiple test circuits includes a first test unit and a second test unit. The first test unit includes a first transistor and a buzzer. The base (B) of the first transistor is connected to the output pin, its emitter (E) is grounded, and its collector (C) is connected to the negative terminal of the buzzer. The second test unit includes a second transistor and an LED. The base (B) of the second transistor and the first transistor are connected to the same output pin. The emitter (E) of the second transistor is grounded, and its collector (C) is connected to the negative terminal of the LED. The buzzers of the multiple test circuits are all powered by a DC power supply, and the positive terminals of the LEDs of the multiple test circuits are all connected to the same power chip.

2. The switch circuit test board according to claim 1, characterized in that, The first test unit further includes a first current-limiting resistor, and the second test unit further includes a second current-limiting resistor. The first current-limiting resistor is connected between the base (B) of the first transistor and the connector, and the second current-limiting resistor is connected between the base (B) of the second transistor and the connector.

3. A switch circuit test board according to claim 1, characterized in that, The positive terminal of the buzzer is also connected to the negative terminal of the protection diode, and the negative terminal of the buzzer is connected to the positive terminal of the protection diode.

4. A switch circuit test board according to claim 1, characterized in that, The power chip has filter capacitors at both its input and output terminals.

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