Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The circuit is CMOS using an integrated 4011.
This circuit was found in an American 80's circuit board. The components used are current except the...
We found this circuit in an 80's manual. The same configuration can be adapted to make use of...
In this 1964 Electronic Design circuit, the frequency division of the signal is done according to the...