We found this circuit in a Linear Technology documentation from the 80's. It has a demodulator, being suitable for links and remote controls. Note the unusual type of detector configuration.
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
This power supply is not protected from shorts in the output. Output voltage is given by the...
Any power MOSFET that supports the current of the controlled stepper motor can be used on this...