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.
The input frequency of a signal applied to this circuit will be divided by one to 9999 in this...
This simple stage can operate with low frequency signals (audio), driving a small lodspeaker....
This shoot-to-target game uses well-known CMOS circuits and the player hits the LED by squeezing...