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Registered Member #3970
Joined: Sun Jun 26 2011, 02:19PM
Location:
Posts: 2
Has anyone ever tried running the discharge of a tesla coil through a battery (like a 9V)? Any experience on just how unwise this might be (e.g. superheating, explosions, etc.?)? (Actually I'd probably use one of those little handheld, low current Oudin coils).
For background - I want to create a high-voltage, high-frequency signal WITH a small DC offset. I am thinking that a simple battery might be the way to go (cheap, easy to replace) but want to make sure that this is not a terribly dangerous thing to do first.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
It's quite possible to superimpose the HF onto a DC signal (basically what you describe) but it is usual to put a choke (low pass filter) across the battery/DC source.
A capacitor across the battery will achieve this, but I'd use a choke (inductor) and two capacitors (same configuration as the EMI mains filter on most electrical equipment).
This is the same primciple that HF TIG welders use.
I used a couple of home made capacitors and a choke wound on a 50/60 Hz core for my TIG welder.
EDIT: This schematic shows the basic principle:
You wind the choke so that the two coils oppose each other and cancel out the HF signal, thus blocking it. The second capacitor is just there 'in case'. The first capacitor acts as an HF shunt (I think that's the correct terminology)
Registered Member #3970
Joined: Sun Jun 26 2011, 02:19PM
Location:
Posts: 2
Yes, I have considered putting an inductive choke into the circuit to shield the battery from the HF-HV signal. However, the coupling between the battery and the tesla coil is already a capacitor - it is the battery side of the capacitor that I am interested in (this is a research project) and I want that side maintained at a constant voltage. Putting a choke in this circuit will maintain the battery side of the capacitor at a quasi-constant charge but not a constant voltage. This would significantly complicate the outcome of what I am trying to accomplish.
The capacitor across the battery terminals to provide an alternate path for the current is a good idea though. May try that. Thanks.
Still curious if anyone has ever hooked up a tesla coil across a battery and knows what would happen. (If no-one has tried this I may have to for sheer cat-killing curiousity.)
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Adding DC to a coil output has been done, but with a capacitor, not a battery. Search for "supersize your minicoil" and you should find the thread. He used a very high voltage so I don't think a battery would yield magnificent results. Well, I guess it depends on the battery.
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DC offset to a Tesla coil & Discharge through a battery
