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.
/just posting here to subscribe.
I'm almost finished building one of Panson's compact amps, the build has gone well, and initial testing is promising.
Fran
I'm almost finished building one of Panson's compact amps, the build has gone well, and initial testing is promising.
Fran
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
Attachments
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
Hi panson,
Parts are solderer on board only NJL are not. I have on hand heatsink that mesure 300x75mm with 40mm thick (30mmfins and 10mm base). Would one so heatsink per amp board sufficient?
Marc
Parts are solderer on board only NJL are not. I have on hand heatsink that mesure 300x75mm with 40mm thick (30mmfins and 10mm base). Would one so heatsink per amp board sufficient?
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
2nd generation board
I want to make a 2nd generation of this amp board. A Baker clamp as shown in Fig. 17.2 of Bob's book is being considered for LME49811. A sketch is show below. Any comment?
I want to make a 2nd generation of this amp board. A Baker clamp as shown in Fig. 17.2 of Bob's book is being considered for LME49811. A sketch is show below. Any comment?