This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the input. The circuit must be powered by a voltage of 5 V.
This is another of the Star Trek red alert circuit that you can find on this site. We took this...
This step was found in the 1960 Mullard transistor reference manual. The transistor can be a BC558...
We found this circuit in the November 1975 issue of Radio Electronics magazine. It uses a digital...