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Old 29th November 2020, 05:15 AM   #1471
tcpip is offline tcpip  India
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Location: Mumbai, India
Quote:
Originally Posted by bullittstang View Post
Edit: Could be wrong, but looks like a single voltage SMPS by your pic? You need dual voltage smps.
I haven't seen lots of SMPS spec, but I've never seen any which has symmetrical bipolar output. I've usually seen people using two single-ended SMPS "one below the other" to create a symmetrical supply. Can you point me to symmetrical output SMPS models?
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Old 29th November 2020, 09:25 AM   #1472
J.M.K is offline J.M.K  France
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Location: France
Default Cresnet / Microaudio

Go and see Sami there ............

Audio SMPS units for sale

His smps modules will fit perfectly ........

JMK
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Old 29th November 2020, 09:31 AM   #1473
tcpip is offline tcpip  India
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Quote:
Originally Posted by J.M.K View Post
Go and see Sami there ............



Audio SMPS units for sale


JMK
Ah, I've heard about Cresnet.
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Old 29th November 2020, 09:36 AM   #1474
Bassivus is offline Bassivus  Serbia
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Location: Novi Sad, Vojvodina
Quote:
Originally Posted by J.M.K View Post
Go and see Sami there ............

Audio SMPS units for sale

His smps modules will fit perfectly ........

JMK
One more vote for Cresnet SMPS!
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Old 29th November 2020, 09:41 AM   #1475
Torvbakkane is offline Torvbakkane  Norway
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Join Date: Dec 2018
Hi,
Yes I have used SMPS with double output for positive and negative voltage out, with earth as the center. For my V4H I use two 800VA with 55V (500VA continuous load at 25 C).
And there are many with double voltage output () in the market, many suppliers set up to the voltage you want within given parameters, so there is probably always something to find that fits.
Ref to my previous post #1457 with a picture of the amplifier.
Regards
Helge
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Old 29th November 2020, 09:56 AM   #1476
Torvbakkane is offline Torvbakkane  Norway
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Join Date: Dec 2018
Supplier in France:
- CONNEX SMPS2000RxE Switched Mode Power Supply Module 2000W +/-55V - Audiophonics

Ref to DiYAudio page:
- Audio SMPS units for sale

Regards
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Old 29th November 2020, 12:46 PM   #1477
nrabbit is offline nrabbit
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Join Date: Jun 2020
Yes I am realizing that is the problem. Time for a new SMPS. Thanks everybody!!

Last edited by nrabbit; 29th November 2020 at 12:48 PM. Reason: typo
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Old 1st December 2020, 11:57 AM   #1478
shaan is offline shaan  India
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Join Date: Mar 2009
Location: Kolkata
GB UPDATE:

Torvbakkane - 6 PCBs - SHIPPED
Faizal Mansar Alam - 2 MODULES - SHIPPED
J.M.K - 4 PCBs - SHIPPED
prairieboy - 2 PCBs - SHIPPED
nrabbit - 2 PCBs + MOSFETS - SHIPPED
deps - 2 PCBs - SHIPPED
Greg1017 - 2 PCBs + MOSFETS - SHIPPED
CitizenKane - 4 PCBs - SHIPPED
surajspai - 2 PCBs - SHIPPED
Rick G - 4 PCBs - SHIPPED
blek stena - 2 PCBs - SHIPPED
routhun - 2 PCBs - SHIPPED
apnneto - 2 PCBs - SHIPPED
RobSoet - 4 PCBs + MOSFETS - SHIPPED

Pistollero - 2 PCBs + MOSFETS - DELAYED DUE TO TEMPORARY SUSPENSION OF SERVICE.

The suspended one will be shipped as soon as shipping service resumes to Portugal. I exhausted my last set of the SMD diodes and the subsequent batch from RS took about three weeks to come due to some complication. As a result the last few shippings got delayed.

Thanks to everyone for your patience.
__________________
V4 | V4H | PSU | PREAMP | ALPS 50Kohm Log Pots
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Old 6th December 2020, 09:39 AM   #1479
J.M.K is offline J.M.K  France
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Default still trying to matchv Q1 / Q2

Quote:
Originally Posted by J.M.K View Post
I'm having a hard time matching Q1 - Q2

Most BC546B I found have hfe around 415
and most BC556B hfe around 290 -> 330

I have 2 best couples BC546=276 / BC556=281 wich is good
and BC546=402 / BC556=341 .... not so good

And I need some more for another amplifier.

My sources for bjt are Mouser and Farnell.

Any idea for a source of BC546B with a hfe lower than 400 ?

Thanks a lot

JM
I'm still into it.
The best Hfe match I got are some BC556B around 348 and
almost all BC546B around 414.
Is it going to actually make any audible issue ?
Anybody knowing a reliable source for something better ?

JM
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Old 7th December 2020, 07:53 AM   #1480
meanman1964 is offline meanman1964  Belgium
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I own the first 4H boards , which can be updated to Rev 1 but is it possible to updated to Rev 2 ?
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