This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and the SCR is a general purpose type The pitch frequency is given by R1 and C1 as formula next to the diagram.
This inverter circuit was found in a Radio Electronics. It shows the basic configuration of a...
Found in a 1980s American publication for amateur radio this circuit uses components from the era. The...
The figure shows how to implement a stage with an emitter follower. The stage has high input...