This circuit was found in the February 1971 issue of Radio Electronics magazine. It is designed to power the previous circuit, providing a maximum current of around 50 mA.
Any power MOSFET that supports the current of the controlled stepper motor can be used on this...
This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit...
This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical...