This circuit is from American documentation from 1970. It can be designed with a BC558 and for the operational, we can use equivalents. The FET can be the BF245.
This circuit from the 70s uses components from that time. The converter and SAR are components that...
This series LED circuit was found in the February 1992 issue of Radio Electronics magazine. The...
This circuit senses two-way currents serving to monitor battery charge and discharge. We find it...