This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
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...