Guitar Amplifier (T991E)

This 1945 circuit has good power and is powered from the mains. The source uses a transformer and the sensitivity for pickups is good.

Zero Crossing Detector (CB4000E)
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...
Schmitt Trigger (CB999E)
This circuit was found in an old publication about transistor. The original trasistors are...
Battery charger (CB1225E)
This 6 V battery charger was found on a 1987 Hands On Electronics. Rc determines the charging...