This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
This 600 kHz circuit is designed to locate a lost boat anchor. The circuit has a range of up to 10...
This circuit for the 11-meter band, operating at 29.255 MHz was found in a Radio Electronics dated...
This transmitting circuit for an infrared intercom is from Texas Instruments. The operational...