This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.
This circuit was found in a Popular Electronics from the 90s. The components admit equivalents and the...
The integrated circuit used in this amplifier is not common today. The circuit is from a...
The output of this circuit can be a crystal phone or a piezoelectric capsule. The circuit tests the...