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Interesting SCR. Could work as a sine oscillator. Or a small sparkgap substitute/better coilgun.

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LAN_403

Inducktion

Fri Mar 11 2011, 11:43PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Just thinking, it could be used for a machine gun type of coil, perhaps. If you could use a fast refreshing volt-meter you could easily tell when the cap is about to fire. Or, you could use a normal switch on the outside of the circuit where the mains come in, and it would prevent having to use an external gate switch for the SCR.

If the circuit built into the package isn't enough, you could rebuild the same circuit and use it for higher power purposes. Changing the zener diode changes when the SCR fires, allowing for a pretty big degree of control.

What are your views on this snazzy little device?

Zero

Sun Mar 13 2011, 06:17PM

Registered Member #3588 Joined: Sat Jan 08 2011, 11:19AM
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Posts: 36

Whats your plan? Machine gun? You need alot of watt for that.

Inducktion

Sun Mar 13 2011, 06:22PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

I know it would need a lot of power...It's just a small thought though.

Turkey9

Sun Mar 13 2011, 06:52PM

Registered Member #1451 Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661

I think it could work, but personally I'd go a more controlled route. With that scr, it will just go off when the voltage gets to the right point. That means you will never really know when it's gonna go off or the frequency on the shots. I'd rather monitor the voltage and manually trigger an scr when the time came.

Inducktion

Sun Mar 13 2011, 08:29PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Turkey9 wrote ...

I think it could work, but personally I'd go a more controlled route. With that scr, it will just go off when the voltage gets to the right point. That means you will never really know when it's gonna go off or the frequency on the shots. I'd rather monitor the voltage and manually trigger an scr when the time came.

Could be used as an oscillator in a pinch then huh?

Turkey9

Sun Mar 13 2011, 10:09PM

Registered Member #1451 Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661

You know, I'm sure it could. I bet it could be used for a ignition coil driver as well instead of using MOV.

Inducktion

Mon Mar 14 2011, 01:38AM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Turkey9 wrote ...

You know, I'm sure it could. I bet it could be used for a ignition coil driver as well instead of using MOV.

And if you needed more power you could probably remake the circuit within the package...or parallel them too.

Actually, thinking about it more it could be used as a sine wave oscillator circuit, or a spark gap substitution...hmmmmmmmmmmmmmm.
If you rebuillt the circuit within the package you could use any value zener diode, and thus able to create an adjustable "spark gap" so to speak. Very interesting.

Navrit Bal

Wed May 04 2011, 07:27PM

Registered Member #3323 Joined: Sun Oct 17 2010, 03:19PM
Location: West Midlands, UK
Posts: 116

Wouldn't that be considerably better than a simple spark gap since there would not be that (usually) unwanted air resistance for a spark gap otherwise?

Also there wouldn't be the sparking which would produce ozone and all sorts of EMI, which would be better unless you wanted all of those things of course

Finally, this would work at lower voltages (high current since this uses an SCR) which you wouldn't otherwise be able to use a spark-gap type device for.

Steve Conner

Fri May 06 2011, 11:57AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

These devices are pretty similar to SIDACs. There have been lots of ignition coil drivers, and even Tesla coil drivers, built with SIDACs, either singles or series strings.

In particular there was an interesting hybrid IGBT/SIDAC stack called the SISG, and developments with names like BRISG, T-BRISG and so on. These drove Tesla coils making sparks up to several feet. Search the forum for details.

I consider all of them just minor variations on Terry Fritz's OLTC, an almost 10 year old concept which I experimented with up to 4kW and 2 meter long spark.

Inducktion

Tue May 10 2011, 12:49PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

I thought SIDAC's had problems of sorts?

I don't know. It'd be interesting to see a circuit based off of this. I'll probably get around to it eventually once I have some free time or get bored enough to try it.

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