This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
September 2017 - Texas Instruments DRV5032 Hall Effect sensors, an ultra-low power digital switch...
This circuit was found in a 1990 Electronics World magazine. The circuit can be mounted today by...
This circuit produces low power flashes in a LED. Frequency is adjusted by P1 and depends also on...