This circuit was found in a 80's Popular Electronics. The sensor can be any phototransistor. The circuit is indicated for an audio link modulated in pulses.
The LM320 is a negative voltage regulator up to 15 V with maximum current of 1 A. In this circuit we...
This configuration using a CMOS IC produces a 1 MHz signal. The circuit can be used as clock in...
This conventional bistable power control circuit using triac was found in the June 1970 Radio...