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.
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.
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!
I don't see NJL3281 and NJL1302 on your site.
You have 2 flavors to choose from. If you read all the datasheets...
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.
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
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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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
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.
Marc
don't worry for stability. no problem.
Ok , thanks, than i will build with NJL4281/4302 and 5171/1930.
Marc
If I am allowed to give an answer to that question, I would say that such a heatsink
is large enough. But, if it would still get hot, you better mount a fan in front of it.
No, NO PANIC !! It does not need to run ful speed !!
A very slow running fan makes a heatsink so much more effective, that a smaller
heatsink is large enough, (and cheeper) or keeps it much cooler.
You never hear that fan !
Kind regards,
Eddie
is large enough. But, if it would still get hot, you better mount a fan in front of it.
No, NO PANIC !! It does not need to run ful speed !!
A very slow running fan makes a heatsink so much more effective, that a smaller
heatsink is large enough, (and cheeper) or keeps it much cooler.
You never hear that fan !
Kind regards,
Eddie
Here they are. NJL devices will be soldered when mounting on heatsink. I have to mount LME49810 and driver heatsink too.
Marc
Nice build! The heatsink should be big enough.
If I am allowed to give an answer to that question, I would say that such a heatsink
is large enough. But, if it would still get hot, you better mount a fan in front of it.
No, NO PANIC !! It does not need to run ful speed !!
A very slow running fan makes a heatsink so much more effective, that a smaller
heatsink is large enough, (and cheeper) or keeps it much cooler.
You never hear that fan !
Kind regards,
Eddie
Absolutely agree with Eddie.
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