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Registered Member #259
Joined: Sun Feb 26 2006, 05:57PM
Location: Friday Harbor, Wa
Posts: 18
I am building a resonant DC tesla coil, and am very close to completion.
2500v MOT, 4x voltage multiplier (10kv 80ma)
ARSG
24kv 0.0125 uf cap, 0.15 snubber cap mmc
4" secondary
2 toroid topload
Charging reactor, 4 MOTs with secondaries connected in series, open primaries, and 'I' blocks cut off and separated by 1/8" from the 'E' block.
I connect everying with bolts and 6 awg wire. I use a small variac to control the arsg. So far the output is almost non-existant, only a few inches. I have tested the supply with 9v AC, and got 700 volts out, which is what I should get, but the capacitor only chargeds up to 700v. With the DC resonant system I build it should be charged up to 2x supply voltage. What gives? This means the cap bank is only charged up to 9000v. Does anyone have suggestions? Help!
Registered Member #221
Joined: Mon Feb 20 2006, 05:36PM
Location: Chillicothe Ohio
Posts: 12
You might want to try using a rotary spark gap in series with your static gap.
On small DC resonant systems with static spark gaps I have had interesting results using the secondary of a neon sign transformer as a charging reactor. You don't get real long sparks but your "breaks per second" is real high. So high that the coil makes a wining noise and puts out a flame like spark.
Registered Member #259
Joined: Sun Feb 26 2006, 05:57PM
Location: Friday Harbor, Wa
Posts: 18
I am not certain what my BPS are, but I with my configuration I am pretty sure that it is 100-500. The sparks in the gap are much smaller and quiter than they should be >:(, and it does not always spark ( I can see breaks in the spark) even though the gap is set very close. I will try taking off the 'I's entirely.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The voltage won't actually double until the spark gap starts firing.
The thing about needing a certain maximum inductance for DC charging is a myth. No matter how big the inductance is, the tank capacitor still charges to twice the DC supply voltage. This has been known since the 1940s. However, using a small enough inductance to give discontinuous current may make it easier for the spark gap to quench.
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DC no-resonance
