Found in an 80's Hands On Electronics, this circuit turns on a light when it gets dark and goes out when it gets dark. The circuit can be adapted to use high-brightness white LEDs.
We can use high value electrolytic capacitors in alternating current circuits with the...
This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V...
Found in an old Popular Electronics, the sparker is driven by a motor being adapted to the...