This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
This Linear Technology circuit was found in a 1980s documentation. The circuit can swing up to a...
This metal detector circuit uses an AM radio as an indicator. The radio is placed off-station and tuned...