Suggested by General Electric this circuit has 3 control positions for one load. The diode is according to the controlled load current.
Found in documentation from the 1980s, this circuit uses components from that time. The circuit is...
This transmitter uses a small loudespeaker (FTE) as microphone and can send the signals to...
This circuit was found in a 1970's Radio Electronics. The pulse transformer has a 1: 1 turn ratio....