This circuit was taken from an article in Electronics Now magazine in February 1995. The power supply must be dual and other operational amplifier can be used.
This circuit was found in old American documentation. Transistor is general purpose and coil rated...
This tiny photocell-powered audio oscillator was found in a book on transistors from the 1960s. The...
This circuit was found in a Hands On Electronics from the 90s. It is intended to supply old tape...