This different circuit was patented and described in the Radio Electronics magazine of March 1958. In that section it used to present different configurations that received patents.
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...