This circuit is from a 1965 Motorola manual. It can be implemented with a common 2N2646 and a 106 Series SCR without problems. The pulse transformer has a 1: 1 turn ratio.
The original transistor for this circuit from a 1973 publication is germanium, but a silicon...
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...
The sensors in this circuit that triggers when the temperature goes out of a certain range are...