Probe for testing transistors. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Probe for testing transistors. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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I have been using this probe (see figure), the scheme of which I met in B. Alginin's book "Electronic Automation Circle", for many years. The advantage of the probe is that in many cases it allows you to check the health of transistors without soldering them out of the structure. It is enough just to connect the probes X1-X3 to the corresponding terminals of the transistor.

Probe for testing transistors

If the transistor is working, the AF generator is working, which is formed by the radio elements shown in the diagram and the transistor itself. A sound is heard from the BF1 headphone. Generations are achieved by a variable resistor R2, the engine of which is moved to the left or right according to the scheme.

With an internal short circuit of the transistor electrodes, the HL1 lamp flashes, and if any electrode is broken in the circuit, neither the lamp nor the phone will react.

The probe used a lamp SMN 6,3-20, a telephone with a resistance of 60 Ohm (TM-2A), a variable resistor SPO-0,5, a constant resistor MLT-0,125, a capacitor KM-5. Transformer T1 is made on a ring core of size K10x6x6 from HM1500 ferrite. Winding I contains 45, II - 180, III - 90 turns of wire PELSHO 0,1.

The SA1 switch supplies power to the probe, and the SA2 switch changes the polarity of the voltage supplied to the generator, depending on the structure of the transistor under test.

Author: S.Dorofeev

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