This circuit generates various types of sounds and can be used as a toy. The circuit is from Radio Electronics from January 1983. The amplifier can be replaced with a more modern type.
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...