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.
The commercial MT2B receiver manufactured in Japan in the 1960s had a listening device only and...
This is one of the many integrated integrator circuits that the reader can find on the website. The...
This first order Butterworth filter is tuned to frequencies around 1 kHz. The frequency is given...