This circuit with two transistors was found in ancient European documentation. Transistors support equivalents. The indicator on this circuit is an ordinary 50 to 100 mA lamp.
This circuit was originally designed for the practice of Morse code, something common in 1966, the year...
The quiescent current of this alarm is in the order of microamps and the same is true for the...
This 4-digit counter was found in a 1997 documentation. It uses CMOS integrated circuits and can...