A simple transistor tester. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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A simple transistor tester. 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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A simple transistor tester allows you to check the performance of npn and pnp bipolar transistors.

Simple transistor tester

The transistor under test, together with one of the transistors installed in the device (depending on the structure of the transistor under test, determined by the position of switch S1) V1 or V2, forms a multivibrator that generates low-frequency oscillations. Indicators of the presence of oscillations, and hence the health of the transistor under test, are the LEDs V3 and V4, which flash with a frequency generated by the multivibrator.

This device can check transistors of low, medium and, in some cases, high power. Using the resistor R1, the (approximately) amplifying properties of the low-power transistor under test are evaluated - the greater the resistance of the inserted part of the resistor, at which the multivibrator is still operating, the higher the current transfer coefficient of this transistor. The instrument is powered by one 3336L battery.

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