This circuit is from the 1990 Motorola Linear Databook, which can be developed with more modern equivalent operating systems. The 1 uF capacitor should be of good quality polyester with small leaks
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...