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.
This is the traditional unregulated power supply configuration with full wave rectification. For currents...
Home automation systems are becoming smarter and more connected with the launch of every new...
This simple circuit has its trigger point set in the trimpot. The transistor can be any general...