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.
Originally created to power an 80's RTTY printer, this circuit can be used in other applications. The...
Using a Norton operational amplifier circuit, we have in the figure a variable voltage regulator. The...
This powerful sound emitter used in defense to intimidate people was found in a 90s Popular...