This circuit was found in an English magazine from 1983, but it can be assembled with BC548 for bipolar and BF245 for FET. The circuit allows using a common LED as a photo diode. Consumption is very low, enabling battery power.
This circuit was found in an English magazine from 1983, but it can be assembled with BC548 for bipolar and BF245 for FET. The circuit allows using a common LED as a photo diode. Consumption is very low, enabling battery power.