This circuit was found in an Electronic Design. It makes use of a relaxation oscillator to trigger an SCR and two relays. The circuit operates at frequencies of 12 to 180 cycles per minute.
This traditional amplifier configuration is from the National Semiconductor's Linear Applications Handbook...
We found this circuit in a Radio Electronics from February 1966. The circuit uses a germanium...
This circuit originally appeared in a publication of 1997. With the changes, the circuit can be...