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.
Found in a 90s Popular Electronics, this circuit monitors an RF signal providing a DC output. The...
This circuit can be used as a shield to control the matrix flow of 100 LEDs from a single output of...
The circuit in the figure generates a high continuous voltage, on the order of 40 to 6oV under a...