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Registered Member #54655
Joined: Thu Mar 19 2015, 05:56PM
Location: BC, Canada
Posts: 82
That was another idea that I had a while ago. I was also wondering if 2 rotary gaps wired in parallel running at different speeds, and hooked up to a dc system with a filter capacitor, would play two notes at once?
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Benjamin wrote ...
As cool as they are,I'm not talking about SIDAC TC's. If there is any way to build a musical coil with a triggered spark gap, I want to try it. Because musical coils are awesome and I haven't had much luck with solid state stuff. It's fine if I'm limited to lower notes.
A triggered SIDAC and triggered spark gap should actually behave fairly similarly (assuming ionized air from previous firings doesn't cause issues at high breakrates). They both connect the tank cap and coil together upon triggered firing, and quench/turn-off after most of the energy has left the tank. Note that Finn Hammer's coil looks like a low voltage (OLTC-like) one using just 1 IGBT for the "gap" and a low-L/high-C tank, but the idea is still the same.
My suggestion is to give it a go, be the first! :)
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Benjamin wrote ...
That was another idea that I had a while ago. I was also wondering if 2 rotary gaps wired in parallel running at different speeds, and hooked up to a dc system with a filter capacitor, would play two notes at once?
I'm not sure if it would play two very distinct tones once, but it could be rather fun to play around with. With an asynchronous gap and AC input you see a lot of surging, because the capacitor is charged to a higher voltage much faster at the peaks of the sine wave. You can see/hear a really good example towards the end of this video of Ed Wingate's infamous magnifier:
If you had two rotary gaps in parallel with a DC supply and both gaps were firing at 50 BPS, with one shifted by exactly 180 degrees, the resulting streamer would sound very similar to a coil with a single rotary gap firing at 100 BPS. I think. I imagine it would be possible to create interesting surging effects with two parallel gaps firing at different rates, kinda similar to the interrupters used with VTTC's (like the surging effect seen half way through this video:
I have no idea how you could control the phase difference between the gaps accurately, but someone more mechanically-inclined could possibly find a solution.
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Musical dc triggered gap coil?
