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 circuit can be found in a 1970 Motorola documentation. The circuit can be implemented with general...
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
This circuit of a 1991 PE Hobbyst Handbook allows the brightness of the incandescent lamp to be...