user TURBO?s replication of Steven Mark?s TPU ?

[Grumpy]

Dave, stop teasing...

http://www.kz1300.com/hfgc/

[CTG Labs]

Grumpy, my intention is not to tease and I appologise to anyone who feels that way.


Regards,

Dave.

[Grumpy]

Dave, was not meant as an attack on your person.

Lighten up.

[MeggerMan]

Hi Alex,
Looking at your pulse circuit I think you need to remove those 10 Ohm resistors altogether.
All you are doing is warming up the air.
You need to take them out, drop the input voltage down to say 1V to start with and work your way up. Hopefully you have one of those bench supplies that go right down to 0.01V at 2 to 3 amps.

If you supply the pulse circuit from a different supply you can feed your 3 mosfets with any voltage you want and seeing as you are using heavy gauge wire the lower the better.

Also, because you have a fixed PCB design it may be tricky to change the pulse width, I think if you look at the 555 timer spec there is a duty cycle selection that can be made using the +ve input for an op-amp connected to pin 6 and a potential divider connected to the -ve input, this way you can go from 0 to probably 90% duty.

I am in the process of testing a mosfet couple to a TL494 at the moment, I will let you know how well it works.

Regards

Rob

[Grumpy]

put the zener diode as close to the mosfet as possible