Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The transducer is the type that fits on the finger to monitor the transparency and thus the beats.
The circuit shown has the advantage over the reductions with resistors to have a much higher...
This circuit uses a switch to select the direction of rotation of a DC motor. It was found in the...
Found in American documentation, this circuit can make use of modern equivalent transistors. The...