PeeCeeBee V4H GB

[vvs07]

Ajit - 2pc
steefdebruijn - 2pc
amitskamal - 1 full stereo kit with all components.
Neurotica - 2 PCBs
vvs07 - 4 PCBs

 

[ckwong99]

Thanks Shaan your kindly reply.
Your info is invaluable.
Somehow i find few circuit design will use individual frontend psu . However i am not sure how the best to the sound and what listening feel would be changed. So i want to do a trial and compare. Anyway diy is like my this behavior. 😀

 

[Terdalian]

pl count me in for ONE Stereo set along with whatever components are part of this Group Buy

 

[outtek]

Ajit - 2pc
steefdebruijn - 2pc
amitskamal - 1 full stereo kit with all components.
Neurotica - 2 PCBs
vvs07 - 4 PCBs
outtek - 2 PCB and power mosfet kit for the two boards (invoice received and paid)

 

[shaan]

Hi Outtek.

The invoice I sent is for shipping charge for the PSU board scheduled for shipping soon.

I haven't started sending v4h invoices for GB2 yet. Will update here as soon as I do.

 

[outtek]

Ajit - 2pc
steefdebruijn - 2pc
amitskamal - 1 full stereo kit with all components.
Neurotica - 2 PCBs
vvs07 - 4 PCBs
outtek - 2 PCB and power mosfet kit for the two boards

 

[craydive]

Hi Patrick.

For V4H +/-56V PSU with at least 10,000uF per rail is good for one channel.

Hi Shaan,
working backwards this would mean a toroidal transformer with secondary windings at 40VAC-0-40VAC. (giving a rail voltage of approx 55.6VDC)

I just want to confirm that I can use the 63VDC rail capacitors ie 10000uF in the PSU, or do I need to go to a higher capacitor voltage rating.
kind regards
stevet

 

[craydive]

correction it should read 56.6VDC not 55.6VDC, slip of the keyboard

 

[pieter t]

You are forgetting the voltage drop across the rectifier diodes.

 

[craydive]

silicon diodes for full wave rectification say 0.6V x 2, so the voltage drops by 1.2V.
so now 55.4VDC-ish.
Thanks Pieter, I should have thought more about it.

 

[CitizenKane]

silicon diodes for full wave rectification say 0.6V x 2, so the voltage drops by 1.2V.
so now 55.4VDC-ish.
Thanks Pieter, I should have thought more about it.

Don't forget B of the transformer. Mine have a given and measured B of 1.08 so I have to start calculating from 40V * 1.08 = 43.20 V.
Results f.e.g. in 43.2V * 1.414 = 61.08V - 1.2 V = 59.88 V (without load).

(Also my diodes differ from fact-sheet: given 0.72 V so I should have 1.435 V. But measured 1.54 V.)

Simulated load of the whole PSU with power-resistors results in a voltage drop of 5.7V.

So I would get 59.88 V - 5.7 V = 54.18 V if the mains-voltage of 230 V would not vary from 207 V to 253 V (± 10%).


So theoretical I can get the min. value or the max. value:
min.: 48.76 V (-10%) / max.: 59.6 V (+10%).

 

[smouse]

Hey. Can I enroll in 2 boards and sets of parts?

 

[outtek]

Hi Shaan, when will the group buy start? Thanks.

 

[shaan]

@smouse
Yes you can.

@outtek
In a couple weeks - mid June.

 

[outtek]

Hi, Shaan, just ship my PSU board in that case, I will have something to do during this time ).
Thanks.

 

[shaan]

Ok I will do that.

 

[fencki]

are there some pics of finished amps here?

 

[HH]

are there some pics of finished amps here?

And maybe some listening impressions too..

 

[supernet]

are there some pics of finished amps here?

Getting close

 

[fencki]

Getting close

looks good.
can´t wait to see finished amps and read about the listening impressions...