We found this circuit in the August 1990 issue of Radio Electronics magazine. The two-digit circuit uses a pressure sensor and is powered by a 9V battery.
In the figure we have a good rectangular signals generator with several frequency bands. The...
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...