The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
Found in a 1970 EEE, this circuit uses general-purpose transistors of the time. Transistors support...
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...
This is a small audio amplifier for headphones for experimental receivers. The transistor can be...