Suggested by a 1990 book for amateurs, this circuit makes use of an integrated component that is not common today. It converts signals from one band to signals in a 10.7 MHz band below.
The transistors for this circuit from an 80's documentation can be the BC548 or 2B222 and the...
In the figure we show a timer, which is simpler because it uses only one of the four gates of the...
This circuit checks the infrared emission of a common remote control. We found it in the March 1993...