2-transistor amplifier (CB26314E)

This amplifier stage was obtained from a Popular Electronics from the 90s. The transistors are general purpose.

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30 mm Optocoupler (CB14668E)
The selected circuit was obtained in a Texas Instruments opto-electronics manual. The transistors can be...
Astable TLC271 (CB11537E)
This circuit is suggested by Texas Instruments' Linear Circuits Applications. It consists of an...
3.5 MHz Crystal Oscillator (CB19353E)
This is a typical quartz crystal oscillator for the 3.5 MHz frequency (80-meter range) used in...