PWM demo for my 7 x 10 minilathe

I'm upgrading my motor controle for my 7 x 10 minilathe, I'm converting it from my original class A amplifier analog design with current feedback, to my version of PWM with current feedback for torque control.

This is a very quick demo. of my version of design using all discrete transistors, for my PWM with torque feedback circuit, that I am going to use for my mini lathe.

I still need to design the oscillator circuit for it, but the main design of getting a pulse width modulation, and feedback for torque control was the aim for this experiment.


The top circuit disconnected with the relay is a idea for a possible current foldback circuit, instead of using inline fuses on the DC side of the supply.

have fun in the shop.

Blog entry information

Last update

More entries in General

More entries from hobbyist

Share this entry