Buffer with MOSFET (CB26318E)

This boost amplifier was found in a Popular Electroniics from the 90s. The circuit operates up to 20 MHz depending on the coils used.

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Low Level Active Triac Shield (CB13905E)
The circuit shown is from a 1975 Motorola thyristor manual. The triac can be of the TIC series and the...
Crystal tester (CB8219E)
This crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for...
Transistor photo flash (CB23667E)
This circuit was found in Radio Electronics magazine from April 1960. It was in an article that...