This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from...
This circuit can be used in panel signaling with common incandescent lamp. The lamp will flash at a...
This Audio System circuit was found in 1965 documentation. It is a 50 ohm line circuit with 22 dB...