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Old 14th August 2018, 01:57 PM   #391
tonza75 is offline tonza75  Europe
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Join Date: Jan 2010
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Ok, is that with the matched Q1, Q2? How to match electrons and holes Npn to Pnp or what means your matching?
Specs are impressive, 2nd harmonics down to a few pW range!
Goes in fW range at 100W 10khz
Not many can archive that, avg32, 64 ok.
250W in 4 ohms, impressive.
Have you done a test in loudspeaker element eg a woofer 100-150hz ~> 500w 4mH
how many watts before instability accurs?

SNR. Better than most sound cards can really do, congratulations!

Last edited by tonza75; 14th August 2018 at 02:00 PM.
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Old 14th August 2018, 02:10 PM   #392
arthur is offline arthur
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PeeCeeBee V4H GB
GB Update:

Ajit - 2 STEREO MODULES - PAID
steefdebruijn - 2 PCBS - PAID
amitskamal - 1 STEREO KIT - PAID
Neurotica - 2 PCBs - PAID
vvs07 - 4 PCBs - PAID
outtek - 2 PCB + 4 PAIR MOSFET - PAID
ejno - 2 PCBS - PAID
craydive - 4 PCBS - PAID
PinkPink - 4 PCBs - PAID
J.M.K - 4 PCBS + 2 PAIR MOSFET - PAID
CitizenKane - 4 PCBs - PAID
gaborbela - 2 PCBs - PAID
Kheon - 2 PCB's - PAID
Oracle1 - 2 PCBs + 4 PAIR MOSFET - PAID
hallcon83 - 4 PCBs - PAID
Sadik - 2 PCBs + 4 PAIR MOSFET - PAID
smouse - 2 PCBS - INVOICE SENT
The Prof - 1 STEREO KIT - INVOICE SENT
Vunce - 2 PCBs + 4 PAIR MOSFET - PAID
Arthur -6pcs.....
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Old 14th August 2018, 03:02 PM   #393
tonza75 is offline tonza75  Europe
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Very good power supply used anyway, the usual linear some magnetic fields on 2nd harmonics seen pW range perhaps

measure the phase gain over audio. freq.
it's really ease.

To be clear rta software was used,
and soundcard measurement.
Will you do more measurements Shaan?
16 boards no way Shaan.
Cnc, or old diy board for me if I tried this one!.
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Old 14th August 2018, 03:37 PM   #394
shaan is offline shaan  India
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Quote:
Originally Posted by tonza75 View Post
Ok, is that with the matched Q1, Q2? How to match electrons and holes Npn to Pnp or what means your matching?
Specs are impressive, 2nd harmonics down to a few pW range!
Goes in fW range at 100W 10khz
Not many can archive that, avg32, 64 ok.
250W in 4 ohms, impressive.
Have you done a test in loudspeaker element eg a woofer 100-150hz ~> 500w 4mH
how many watts before instability accurs?
Matching = HFE matching.

Yes harmonics are pretty low, thanks to D. Self, and harmonic spectrum is sweet, thanks to Late P. Baxandall. They didn't work hand-in-hand from the start. It was hell... lots of innocent mosfets died. But their deaths weren't in vain.

Loudspeaker load measurement hasn't been done, don't care really. In my room a channel is driving my 10" sealed sub pair in parallel, each sub rated 200w 8ohm, 56v psu. So far zero hiccups.

Quote:
SNR. Better than most sound cards can really do, congratulations!
Thanks.

Quote:
Originally Posted by tonza75 View Post
Very good power supply used anyway, the usual linear some magnetic fields on 2nd harmonics seen pW range perhaps
Basic CRC power supply used with KBPC3510 bridge rectifier.

Quote:
measure the phase gain over audio. freq.
it's really ease.
No time, but more importantly, I don't care.

As I didn't attempt designing a precision amplifier, decided to stop splitting hair after a certain sound quality was reached. Some hairs have been split, and some torn (from my head) - it is indeed not very easy to reach that noise floor even when averaging is turned on with an on-board sound card, as you adequately put.

Quote:
To be clear rta software was used,
and soundcard measurement.
Correct. 10/10! :P

Quote:
Will you do more measurements Shaan?
Naahhh...

Quote:
16 boards no way Shaan.
Cnc, or old diy board for me if I tried this one!.
All the bests.
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Old 14th August 2018, 03:39 PM   #395
Oracle1 is offline Oracle1  Greece
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Join Date: Feb 2017
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KP1830 220pF (0.22nF) 160V Polypropylene Capacitors or the polysterine nor the ceramic , maybe the silver mica which is best?
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Old 14th August 2018, 03:46 PM   #396
shaan is offline shaan  India
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Quote:
Originally Posted by Oracle1 View Post
KP1830 220pF (0.22nF) 160V Polypropylene Capacitors or the polysterine nor the ceramic , maybe the silver mica which is best?
If you can get silver mica then close your eyes and grab them!!!

If you can not, then go for ceramic.

If neither silver nor ceramic is available then polypropylene (I guess size will be a problem with polypropylenes) or polystyrine.
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Old 14th August 2018, 03:47 PM   #397
Oracle1 is offline Oracle1  Greece
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Thank you very much.
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Old 14th August 2018, 04:12 PM   #398
tonza75 is offline tonza75  Europe
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No time, but more importantly, I don't care.

Care for money occupied by pcb sale.

Last edited by tonza75; 14th August 2018 at 04:35 PM.
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Old 15th August 2018, 01:50 AM   #399
shaan is offline shaan  India
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Quote:
Originally Posted by tonza75 View Post
Care for money occupied by pcb sale.
Thanks for your kind appreciation.
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Old 15th August 2018, 03:07 AM   #400
Vunce is offline Vunce  United States
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Join Date: Jan 2014
Location: LI, NY
PeeCeeBee V4H GB
GB Update:

Ajit - 2 STEREO MODULES - PAID
steefdebruijn - 2 PCBS - PAID
amitskamal - 1 STEREO KIT - PAID
Neurotica - 2 PCBs - PAID
vvs07 - 4 PCBs - PAID
outtek - 2 PCB + 4 PAIR MOSFET - PAID
ejno - 2 PCBS - PAID
craydive - 4 PCBS - PAID
PinkPink - 4 PCBs - PAID
J.M.K - 4 PCBS + 2 PAIR MOSFET - PAID
CitizenKane - 4 PCBs - PAID
gaborbela - 2 PCBs - PAID
Kheon - 2 PCB's - PAID
Oracle1 - 2 PCBs + 4 PAIR MOSFET - PAID
hallcon83 - 4 PCBs - PAID
Sadik - 2 PCBs + 4 PAIR MOSFET - PAID
smouse - 2 PCBS - INVOICE SENT
The Prof - 1 STEREO KIT - INVOICE SENT
Vunce - 2 PCBs + 4 PAIR MOSFET - PAID
Vunce - 2 PCBs
Arthur -6pcs.....
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