PeeCeeBee V4H GB

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Originally Posted by bullittstang

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?

[J.M.K]

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

Audio SMPS units for sale

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

JMK

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Originally Posted by J.M.K

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



Audio SMPS units for sale


JMK

Ah, I've heard about Cresnet.

[Bassivus]

Originally Posted by J.M.K

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

Audio SMPS units for sale

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

JMK

One more vote for Cresnet SMPS!

[Torvbakkane]

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

[Torvbakkane]

Supplier in France:
- CONNEX SMPS2000RxE Switched Mode Power Supply Module 2000W +/-55V - Audiophonics

Ref to DiYAudio page:
- Audio SMPS units for sale

Regards

[nrabbit]

Yes I am realizing that is the problem. Time for a new SMPS. Thanks everybody!!

[shaan]

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.

[J.M.K]

Originally Posted by J.M.K

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

[meanman1964]

I own the first 4H boards , which can be updated to Rev 1 but is it possible to updated to Rev 2 ?