Phone Patch (CB9398E)

This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio amateur equipment

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Solar spinner (CB20508E)
This solar cell driven circuit makes 4 LEDs run at a speed given by capacitor C2. The circuit is...
Timer with 741 (CB12281E)
The time obtained in this circuit, from a 1978 publication, depends on R3 and C. R3 can have...
Programmed Duty Cycle (CIR095E)
The duty cycle of a Schmitt Oscillator can be programmed by R1 and R2 in this circuit. The...