Using an analog microamperimeter this circuit has a phototransistor adapted to the wheel as a sensor. The circuit is from American documentation from the 1980s, but the components are common today.
This circuit was found in an American documentation from 1969. It serves to trigger circuits by...
This input stage has unit gain but a high input impedance and low output impedance. The circuit is...
The circuit presented was found in the Linear Applications Handbook of the National Semiconductor of 1994....