This direct coupled circuit operates in class AB with good gain. The circuit is powered by 12 V. We found it in a Radio Electronics from October 1963.
This 3 and-a-half digit circuit was found in a Teledyne documentation from the 90s. The circuit uses...
Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer...
This series sensor circuit is from 1995 Popular Electronics. The circuit can use any SCR and the...