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 found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and...
The expansion rate of this circuit is determined by R. The circuit can use any operational...
Found on a 1964 CQ this circuit is intended for tone frequency change modulation (FSK) telegraphic...