Previously Featured Builds

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Jan-Peter Vos

Jan-Peter Vos

Recently, I have finished my X-Rated Balanced Line Stage (X-BLS). First some non-fascinating basics of the building process: the amp… More...
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Alexandru Cota

Alexandru Cota

DESCRIPTION My Zen was built back in 1998 and lately I became tempted by the idea of trying to let… More...

Amp Camp Project — Pass DIY / 2016

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Matching Devices — Nelson Pass / 1993

After you acquire the devices, you will need to test them. You might consider running lots of tests on these transistors, but only one is essential: measuring gate-source voltage versus current. The greatest variations occur here, and it is necessary to do some matching to get proper performance. This test will also tell you whether or not the device is broken. The test is simple and requires a power supply, a resistor, and a DC voltmeter. Figure 12 shows the test hookup for N- and P-channel types. The supply source resistance (R1) is nominal, and is found from I =… More...

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