This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
In the original version of this 1987 circuit, the loads are lamps, but it can be adapted to drive a...
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operative. However,...
This TTL oscillator uses an old TV crystal, having been found in an American publication in 1976....