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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Sinusoidal to Square Converter (CB12150E)
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1 W amplifier with the LM390 (CB13753E)
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
Headphone Amplifier (CB24050E)
This simple amplifier was found in a Radio Electronics magazine from July 1970. The transistors are...