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Re: [TCML] Cap bleeder resistors



Technically, any cap should have a bleeder across it, especially in an
equi-drive circuit where the cap does not have a ground to discharge thru.

I have never used them in over 45 yrs. of Tesla coil building.  I have
handled a lot of coils with MMC and pulse type HV caps.

Here's what happens:  As long as the neon transformer is connected to the
cap the charge will migrate back thru the center tap winding (usually around
70K Ohms impedance) and go directly to ground.

If you have a circuit that is disconnected after coil operation, then
definitely use the bleeders.  If not, don't bother spending the
extra money.

Dr. Resonance




On Wed, Jun 3, 2009 at 7:45 PM, Andrew Robinson <teslamad@xxxxxxx> wrote:

> Now that I think of it, I've never used bleeder resistors in a MMC
> capacitor. Unless my physics are incorrect (someone please correct me)
> bleeder resistors are not necessary in a tesla coil capacitor. I am under
> the impression that they are used to safely discharge the cap after power
> has been shut off, but if you look at a simple tesla coil schematic, a
> complete circuit always exists with the capacitor, preventing charge
> separation... the cap is always in a state of equilibrium when power is off.
> Does the cap staying charged have something to do with the back EMF from the
> primary transformers secondary winding? In all my experience, ive never had
> a cap retain a charge after shutdown. Can someone shed some light on this
> theory. Do you really need bleeder resistors? Thanks
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