This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967 documentation. Transistors can be replaced with modern equivalents.
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...
This is another one of the many versions of this circuit that we have in this section. We found it in...
This circuit controls 6 LEDs in two sets with the phase change cycles controlled by a 555...