Using the CMOS IC 4046 we found this VCO in the November 1984 Radio Electronics magazine. The center frequency is given by the capacitor. The maximum frequency is around a few megahertz.
Using an optocoupler this circuit turns on the light in a bedroom for a set amount of time when...
The presented circuit uses two old germanium transistors. We found this configuration in a...
The circuit shown fires an auxiliary flash from a flash commanded directly by the camera. The sensor...