High-performance induction type electroscope

Abstract

The invention relates to a high-performance induction type electroscope, which consists of a direct-current power supply DC, a key switch AN, an induction electrode A, an induction electrode B, a touch electrode C, a homopolar Darlington circuit, a heteropolar Darlington circuit and an acoustooptical reminding circuit. A traditional test pencil can only normally work by leading the test contact of the test pencil to be directly contacted with a charged metal object to form a complete loop. The high-performance induction type electroscope disclosed by the invention can normally work without being directly contacted with the charged object, and the charged object can be metal or an electrostatic object or a nonmetal body, such as a computer cathode ray tube (CRT) display or a color TV kinescope and the like. The high-performance induction type electroscope disclosed by the invention not only is suitable for detecting low voltage but also is suitable for monitoring 220 V alternating current with higher potential or the electrostatic object and is extremely handy in use. The various traditional test pencils can be completely replaced by the actions and the functions of the high-performance induction type electroscope.

Description

technical field

[0001] The invention belongs to the technical field of electronics and electric engineering, and relates to a high-performance induction electroscope. Background technique

[0002] The common structure of test pens on the market is composed of test electric contacts, current limiting resistors, neon tubes, metal springs and hand electrodes connected in series. The test contact is in contact with the charged metal object under test, and the human hand touches the electrode to form a circuit. When the metal object under test has a higher voltage than the ground, the neon tube lights up, indicating that the metal object under test is charged. However, in actual use, there are many metal casings or metal components of electrical appliances that do not have dangerous electric shock voltages to the human body, and only generate electromotive force (voltage) through the distributed capacitance induction of the metal parts of the electrical appliances. The induced e...

Examples

Embodiment Construction

[0014] According to attached figure 1 The present invention can be realized by implementing the working principle diagram of the circuit shown and the description of the accompanying drawings and the technical requirements described below.

[0015] Component selection and its technical parameters

[0016] 1. The models of the three NPN transistors VT1, VT2 and VT3 in the circuit are: 2SC9013;

[0017] 2. The model of PNP transistor VT4 is: 2SC9012, the β value of the four transistors in the circuit is required to be ≥ 150, the withstand voltage is required to be ≥ 60V, and the higher the withstand voltage is required, the better;

[0018] 3. Buzzer Y requires an internal electronic circuit, working voltage: 2.2 ~ 3.0V;

[0019] 4. The light emitting diode D1 is a red super bright diode.

[0020] Circuit fabrication and circuit debugging

[0021] According to attached figure 1 The working principle diagram of the circuit shown, check whether the welding of all components i...

technical field

[0001] The invention belongs to the technical field of electronics and electric engineering, and relates to a high-performance induction electroscope. Background technique

[0002] The common structure of test pens on the market is composed of test electric contacts, current limiting resistors, neon tubes, metal springs and hand electrodes connected in series. The test contact is in contact with the charged metal object under test, and the human hand touches the electrode to form a circuit. When the metal object under test has a higher voltage than the ground, the neon tube lights up, indicating that the metal object under test is charged. However, in actual use, there are many metal casings or metal components of electrical appliances that do not have dangerous electric shock voltages to the human body, and only generate electromotive force (voltage) through the distributed capacitance induction of the metal parts of the electrical appliances. The induced e...

Examples

Embodiment Construction

[0014] According to attached figure 1 The present invention can be realized by implementing the working principle diagram of the circuit shown and the description of the accompanying drawings and the technical requirements described below.

[0015] Component selection and its technical parameters

[0016] 1. The models of the three NPN transistors VT1, VT2 and VT3 in the circuit are: 2SC9013;

[0017] 2. The model of PNP transistor VT4 is: 2SC9012, the β value of the four transistors in the circuit is required to be ≥ 150, the withstand voltage is required to be ≥ 60V, and the higher the withstand voltage is required, the better;

[0018] 3. Buzzer Y requires an internal electronic circuit, working voltage: 2.2 ~ 3.0V;

[0019] 4. The light emitting diode D1 is a red super bright diode.

[0020] Circuit fabrication and circuit debugging

[0021] According to attached figure 1 The working principle diagram of the circuit shown, check whether the welding of all components i...

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