Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz. Modern equivalent transistors can be used.
This circuit causes the relay to be energized when the input voltage exceeds the voltage value of...
September 2017 - Intersil's ISL850x Synchronized Buck Regulators can be ordered from Mouser...
This circuit is from the 1990 Motorola Linear Databook. The integrated circuit used is the LF355,...