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.
This circuit is from American documentation from the 1980s. The circuit can make use of any common...
Mouser Electronics is now shipping DA14585, a kit for the development of voice remote control...
This circuit is from a 1969 EEE magazine. The transistors are from that time, but the circuit can...