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 circuit triggers a remote doorbell when the phone rings. The circuit is for the 110 V mains...
This circuit uses na Unijunction Transistor (UJT) to produce a modulation tone for several...
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...