This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
This digital electronic dice was found in a 1977 magazine, but it can be easily assembled today, as...
This circuit converts sinusoidal signals into squares and can be powered by voltages from 1.5 to 5...
When the sensor receives light, the relay closes its contacts and remains so even after the light...