Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a small incandescent lamp is activated when it gets dark.
This circuit was obtained from an English circuit manual. Components are common and LEDs can be 3...
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...
This circuit can generate signals from 100 kHz to 1 MHz depending on the L1 coil. For the medium...