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Old 22nd November 2012, 08:23 PM   #1311
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Quote:
Originally Posted by Esperado View Post
LC: i wonder if we can try to study a constant current soft start based on some triac.
NTC suits the need well enough. Maybe it would be better to have inrush current sensing with comparator to turn on the triac when current falls to 20% or so.
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Old 22nd November 2012, 08:26 PM   #1312
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Originally Posted by Idefixes View Post
I have what i need to do setting test but i missing time for moment. I just transfer last week hifi devices to dedicated room that i was building in my basement house.

Marc
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I see you're occupied as well as me lately, anyhow TSSA will give you more insights when operating.
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Old 22nd November 2012, 08:37 PM   #1313
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Super

I see you're occupied as well as me lately, anyhow TSSA will give you more insights when operating.
No doubt,

I have put backside a second stereo BIGBT combination for another amp project as i have on hand two other nice 500Va 2x36V rcore trafo or two 300Va 2x24V.as some more various heatsink.
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Old 22nd November 2012, 08:40 PM   #1314
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Originally Posted by Lazy Cat View Post
NTC suits the need well enough. Maybe it would be better to have inrush current sensing with comparator to turn on the triac when current falls to 20% or so.
My idea was to use a time dependent ramp to fire the Triac, starting at the end of each AC half sinus, and slowly firing the triac up to its beginning as charging time increase (100%). AS top of he sinus will be half the time, even with a simple RC, we have the chance to set a near linear peak current for charging the caps,, just to change the time constant of the amp, to tune-it for different caps values of the PSU.
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Old 22nd November 2012, 08:47 PM   #1315
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Marc, so now you have eight BIGBTs all together ready to go. Very good, for me personally I consider BIGBT as one transistor only because it acts like one, no oscillations, no problems with it whatsoever, it is powerfull, high current capability and high transconductance enables VAS to breathe with full lungs.

Hardly wait to start with your TSSA BIGBT.

My CSA is ready, just waiting to get heatsinks from CAD CAM company.

Last edited by Lazy Cat; 22nd November 2012 at 08:50 PM.
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Old 22nd November 2012, 08:56 PM   #1316
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Esperado, they're just capacitors wanted to suck current, do you really need them to be so safe. Of course it can be done but to MHO it is more like tour de force than just optimal NTC solution. What about triac switching snubber to reduce EMI?
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Old 22nd November 2012, 09:00 PM   #1317
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Lazy, i have eanough matched BJT for 4 BIGBT channel so 4x (matched MJL1302/3281). Two for TSSA BIGBT and Two for another thing not decided, CSA another TSSA.....

Marc
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Old 22nd November 2012, 09:02 PM   #1318
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Originally Posted by Idefixes View Post
Lazy, i have eanough matched BJT for 4 BIGBT channel so 4x (matched MJL1302/3281). Two for TSSA BIGBT and Two for another thing not decided, CSA another TSSA.....

Marc
Nope, two channels of TSSA only, will consume 4 BIGBTs
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Old 22nd November 2012, 09:15 PM   #1319
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Yes i made a mistake as i have 8 matched 3281/1302 couple....

Marc
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Old 22nd November 2012, 09:28 PM   #1320
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Eit is more like tour de force than just optimal NTC solution. What about triac switching snubber to reduce EMI?
I don't like at all those high temp of NTC or resisatence during start-up. EMI is not an issue; it is only during some seconds at start-up. But i understand the simple and easy way.
You do not answered my question about stabilized . Did-you have made the listening test ?
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Last edited by Esperado; 22nd November 2012 at 09:32 PM.
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