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Old 28th August 2012, 07:59 PM   #281
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Originally Posted by klewis View Post
You probably won't come up with a matched pair. Just adjust the Re resistors to get a reasonable balance between the p and n.
That's fine for DC but not for AC.
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Old 28th August 2012, 08:31 PM   #282
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That's fine for DC but not for AC.
You may know more about this than me, but, I (and several others ) used it to good effect on the Fetzilla Amp where we couldn't find matched pairs.
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Old 28th August 2012, 09:24 PM   #283
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You may know more about this than me, but, I (and several others ) used it to good effect on the Fetzilla Amp where we couldn't find matched pairs.
I've been reading Bob Cordell's book. It's excellent!
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Old 29th August 2012, 12:52 AM   #284
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I don't see NJL3281 and NJL1302 on your site.
You have 2 flavors to choose from. If you read all the datasheets...
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Old 29th August 2012, 01:44 AM   #285
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I'm almost finished building one of Panson's compact amps, the build has gone well, and initial testing is promising.

Fran
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Old 13th November 2012, 05:29 PM   #286
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Panson, i suspect that if you'd put your driver transistors on the same heatsink as the thermaltraks' your bias-drift problems will be over. No need for extra diodes..
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Old 13th November 2012, 09:40 PM   #287
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Panson, i suspect that if you'd put your driver transistors on the same heatsink as the thermaltraks' your bias-drift problems will be over. No need for extra diodes..
Hi, I prefer the drivers temperature not being modulated by the output devices.
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Old 23rd November 2012, 05:13 PM   #288
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Hi panson,
I bought 2 of your latestet revision board from someone that forgive project. I purchase all parts i needed as i have some as driver and transistors on hand. I have choice for ThermalTrack Unit between NJL3281/1302 and NJL42381/4302. Do you see an issue in using the second one as it has better SOA charts? I have MJE15030/15031 to but also 2SC5171/2SA1930. Could it be some stability issu in using this faster devices instead of MJE brand?

Marc
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Old 23rd November 2012, 09:58 PM   #289
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Hi panson,
I bought 2 of your latestet revision board from someone that forgive project. I purchase all parts i needed as i have some as driver and transistors on hand. I have choice for ThermalTrack Unit between NJL3281/1302 and NJL42381/4302. Do you see an issue in using the second one as it has better SOA charts? I have MJE15030/15031 to but also 2SC5171/2SA1930. Could it be some stability issu in using this faster devices instead of MJE brand?

Marc
Hi Marc,

No problem at all to use 4281/4301. I used have them.

It should be find to use 5171/1930 to drive one pair ThermalTrak in this Compact Amp, though their current rating is lower.

Cheers,
Panson
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Old 24th November 2012, 08:50 AM   #290
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Originally Posted by panson_hk View Post
Hi Marc,

No problem at all to use 4281/4301. I used have them.

It should be find to use 5171/1930 to drive one pair ThermalTrak in this Compact Amp, though their current rating is lower.

Cheers,
Panson
Tanks for reply, i know 5171/1390 current rating are lower as 15030/15031 but for +/-35Vdc rail use and driving one pair NJL4281/1302 it's more then enough i think, my only concern was on stability issue as they are a lot faster as onsemi devices.

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