This is a diagram of a 1970s reel or tape recorder. It is an Italian Geloso recorder, quite popular at the time. The circuit is a reference for equipment recovery.
This step of high gain and high voltage supply with direct coupling is from a documentation from...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
The integrated circuit used in this 1986 project is uncommon today, but the idea of the output...