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.
Although it is a common configuration today, these circuits were taken from an old publication. The...
The cut-off frequency of the filter shown in the figure can be adjusted to values between...
This flasher or light pulsator can be used in an ordinary flashlight. The circuit can be adapted to...