A simple probe for testing diodes and transistors. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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A simple probe for testing diodes and transistors. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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The probe circuit proposed below is very simple and quite versatile. Allows you to quickly check the performance of transistors, diodes or ring the circuit. If the transistor is good, the corresponding LED will flash, showing the structure of the transistor under test. The tested diode is connected to sockets "E" and "K".

A simple probe for testing diodes and transistors

If the diode is good and the anode is connected to socket "E", then LED "A" will flash. The "K" LED will blink if the cathode of a working diode is connected to the "E" socket. In the event of a faulty diode, either both LEDs flash or none of them light up. The same sockets are used for continuity tests or when testing electrolytic capacitors. The probe supply voltage is 5 volts, in the absence of the necessary power source, the probe can be connected to a computer power source (red wire +5 volts, black wire -5 volts).

Publication: evm.wallst.ru

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