Suggested by an old RCA manual, this circuit makes use of the period components. Data for the transformer is provided in the original documentation from the 1960s.
The circuit shown is from an American publication from 1970. It produces a tone that attracts fish...
Using the 7805 circuit as equivalent, we can obtain 5 V with current up to 1 A. This circuit is...
This circuit was found in 90s Radio Electronics. The transistor can be any general purpose....