This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This circuit with the AD8555 from Analog Devices provides a programmable voltage with a current...
We found this circuit in an English documentation from the 80's. The circuit can make use of...
This car audio amplifier was found in a Popular Electronics Hobbyist Handbook from the 1990s. The...