This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs will flash alternately in these conditions. Common LEDs are used in this circuit.
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...
This circuit is from 1992 documentation. In it we have the way to implement a Baxandall control using...
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...