MOSFET trigger (CB21480E)

This circuit was found in a 1967 Electronic Design. FETs are from the time, so modern equivalents can be used.

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Alarm Siren 4001 (CB24363E)
This two-tone alarm siren was found in the January 1975 issue of Radio Electronics magazine. The...
Audio Peak VU (CB12436E)
We found this peak audio indicator in a 1980 publication. The M1 indicator can be 200 uA with the...
Transistor Amplifier (CB218E)
This is a traditional complementary-output transistor amplifier sourcing 2 to 4 watts to a 4 ohm...