This circuit was found in a Popular Electronics from the 90s. The circuit has temperature compensation. Coil and capacitors depend on the frequency at which the circuit will be used.
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
This CMOS circuit was found in a Popular Electronics from the 80's. The circuit consists of a...
This circuit was found in an American documentation from 1969. The circuit is a multi-indicator with...