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Re: Sold state IGBT disruptive coil spark gap idea

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Interesting things!!!

Anther person is using an SCR and zener strings since he can't get SIDACs in his location...



At 02:25 PM 5/22/2006, you wrote:

You have to be careful to turn up the variac until is just starts to run smoothly (120 BPS) and no more. If you turn up the voltage too high, the BPS rate can go up dramatically and overheat the IGBTs. Higher BPS does not seem to increase spark length other than making them sound funny. Sort of "screetchy". Thanks for everyone's help, input, and encouragement!!! Looks like we all have a new toy :-))))


Sidacs are interesting. Even more interesting are programmable unijunctional transistors or PUTs. PUTS are a misnomer because they are not unijunctional transistors, but are kin to thyristors. The neat part about them is triggering voltage can be set or varied with a simple resistive voltage divider. Instead of multiple fixed input sidacs only one voltage divider controls the PUT. It's programability allows it to function over a wide variety of input voltages. Parts count goes down, it's cheaper to build and it offers better control.