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 low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It...
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...
This transmitter for the 7 MHz range, as we can assume by the number of turns of the coil, since the...