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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Phase 2 inverter (CB22233E)
This circuit was found in an American publication from the 50's. The transistors are made of...
Amplifier for Earphones II (CB975E)
The circuit shown is an amplifier for medium impedance headphones including bass and treble...
Modulated light receiver (CB8787E)Modulated light receiver (CB8787E)
This circuit for an optical audio link using LED or LASER was found in a 90s QST magazine. The circuit...