This signal injector and tracer (follower) was found in an old American documentation. The transistors can be general use and power is made with one or two common cells.
Wired to the output of any amplifier this circuit makes an incandescent lamp flash according the...
This circuit is from an English magazine from 1976. By replacing the transistor for a BC548, the...
The transducer used in this configuration that appears elsewhere on this site is a piezoelectric...