This circuit is suggested by National Semiconductor in its Linear Applications Handbook. The LM3909 integrated circuit consists of a very low consumption oscillator with a power supply of 1.2 V.
This circuit combines field effect and bipolar transistors to obtain a 20 gain with a pass band...
We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The...
The sensor for this alarm is a thin wire that, when interrupted, triggers a buzzer and turns on a...