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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The good old days of spark gap coils! :^)
FWIW, I once did a costing exercise for someone that showed that a DRSSTC was more expensive than a SGTC of the same power output. If you bought the IGBTs and heatsinks new, and costed the driver circuitry at what it really cost to assemble, it added up to more than the SGTC's high voltage transformer.
Of course the game changer is that the DRSSTC can play cheesy tunes.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I wonder if anyone is still making any technological advancements in amateur spark gap design enlight of the solid state Tesla craze in the past 10 years.
The last big push, as least as far as i know, was when Richard Hull and the TCBOR were doing all their research into Magnifier design and designing compound (static / rotary) spark gaps.
I always enjoyed Terry Blakes ARSG designs as well. His innovative approach showed you didn't need fancy machining skills or hard to find sync motors to build a high power rotary spark gap.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
EVR -
Several other interesting implementations of rotary spark gaps:
1. The "DPDT switch" contact arangement for a DC-charged coil. In this design, two pairs of electrodes align initially to connect the tank cap to the charging circuit, further rotation disconnects the cap from the charging circuit, and finally another pair of electrodes come into play to connect the cap to the tank circuit. This isolates the charging circuit from the tank circuit at the time the cap's energy is dumped into the tank circuit.
2. The "super series" arrangement, where there are an equal number of stationary and flying electrodes. All the electrodes are connected in series, so there are many more gaps "in circuit" for improved quenching without requiring any additional series static gaps.
3. The "dual contra-rotating disk" design, where a timing-belt drives two "overlapping" RSG disks. The arc path is stationary electrode #1 to flying electrode on disk #1 to flying electrode on disk #2 to stationary electrode #2. The advantage is (supposedly) the increased approach and separation velocity of the flying electrodes.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I'd like to see the cheesy tunes played with a triggered static gap, and maybe a big transmitting triode to modulate the charging voltage and help with quenching.
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question about different types of spark gaps
