This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
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...