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.
The circuit we present is that of a good power ultrasound generator, as it uses a transistorized output...
Two of the four gates of a 4011 is used in this biestable touch circuit. Do not use a power source...
This encoded lock circuit with alarm for use in homes was found in a publication from the 90s. The...