2019-10-21 Testing Transistor In Circuit

From FB group Vintage Transistor Radios

James Ault

Adam Bernhardt
Maurice Wright is right. The tester puts DC through the device and measures its current gain. But when it’s in circuit it is amplifying AC such as audio or RF, and that’s not what a typical tester does.

Any experienced tech will tell you that the best way to find out if a device is working properly is when it’s in the circuit doing its job. You can measure the DC voltages and currents with a DMM or use an oscilloscope to see the signal as it is amplified by the device.

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