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, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...
This sweep oscillator was found in 1980s American documentation and can be assembled with current...
This circuit uses one of the first commercial transistors, availble in 1958, year of the...