Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
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...