There are other questions in this schematic:

It is correct the value of R4 resistor to 10k? This sets the output, right?
It is correct the value of R1 resistor to 1k and R2 to 18K? If this is so the input current is too limited.
How do you set the frequency? Because VR is to adjust the pulse width, right?
This setup run with frequency fixed around 529 Hz and only adjust pwm (i think).


The company we are getting it from is an all woman company (CST - The Composites Store, Inc.)
I am happy that I made it, actually three, each setup better and the third is in its own case which keeps it out of the way and able to power up anything due to the three differant driver/booster types he gave. I put small switches in instead of the rotory on my last one for the frequency caps and would note that you are not limited to four selections of frequency ranges. One can build most of it on strip boards and have little wire to mess with. Everything is cool and although I put a fan in the box, none is needed. I also used heavier transistors and found that this somehow gives better control.



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