This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
We found this circuit in Radio Electronics magazine from May 1967. The circuit has the tuned...
This circuit is based on a regulator component that consists of a transistor and zener in the same...
This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the...