Quark fried, blown capacitor...

[BrianG]

Originally Posted by AAngel

BTW, I did find the little note in the Quark manual saying that if you need finer low speed control, you should narrow the neutral range, so this is probably why zpb has such fine low speed control and I don't. They do warn that running a narrow neutral range can cause cogging. I'll have to try it.

Yeah, I narrowed my neutral range and can go VERY slow without cogging.

About the floating PCB; I kinda figured. Makes sense that it wasn't cooling if the FETs weren't even attached to the case! I know it's kind of a crappy solution, but S&T probably uses the pad so that they can remove it easily for service. Unfortunately, it doesn't last long. Once you do the "internal mod", your heat problems should be over. I say "should" because with your luck, it won't work. ;)

Adding caps should help even more...

[zeropointbug]

Yes, I had the narrow neutral range as well, that's why.

AAngel, my FET heat spreader was the very same as that! It was only touching half of the FET's, and the PCB moved around easy (slack). But I am thinking that the caps leads being GONE had something to do with it starting on fire.

Are you sure you don't want to wait for my custom quark case for yours? If not, maybe you should epoxy the top FET heat spreader as well, to increase thermal conductivity (power spikes).

I also received the 30 caps this morning, I have the day off so I will see what I can do for a cap bank.:)

Let me know if you are going to do as far as the 'mod', or if you might want my case.

Since we are on the topic of Quarks here...

I bought some 1000uf 35v 85c caps for my quark. Can I use these with out damage to my quark? Also I am putting a custom heatsink on it too. I'll post pics of it later...

Thanks!

Bye:018: