This cassette player motor speed control was found in the January 1991 issue of Radio Electronics magazine. The circuit is for voltages from 9 to 12 V.
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
This circuit is from an 80's documentation, applying to ordinary comparators. The source does not...
This experimental circuit is from a 1975s publication. The coil consists of 80 turns of wire AWG...