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PeeCeeBee V4H GB

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ckwong99

Member
Joined 2005
Hi Shaan ,finally i completed my V4H at 35Vdc with 500mA per each power FET. The sound very nice and open , the bass low band very good and punch. High-Mid band is crystal clear.
Again, i much appreciate your support and strive for this project
 

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Harry3

Member
Joined 2005
gtose said:
Shaan, got my V4Hs in Friday. As usual, they are gorgeous boards and I’m looking forward to a fun build! I’ll be using 2x of Prasi/Project16’s CRC PSUs loaded up with 66mf/rail/channel for a dual mono setup.

One question about the BOM, is it possible to use 500v silver mica instead of the 1000v ceramics?

Thanks!
Greg
Click to expand...

I'll be using 500V mica caps when I get my boards.
There are a number of photos which show mica caps being used in this thread.
 
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Harry3

Member
Joined 2005
Hi Shaan,
I got the boards. Good quality! Thanks.
Do you use a coil on the output? If so, where?


Hi Oracle,
if the transformer outputs are 35Vac you will get approximately 49Vdc when filtered. I think Shaan used 56Volts dc for his specifications.
I will be using something similar to you.
 
K

kheon

Member
Joined 2011
Do you think it impoves the sound a lot ?
How much capacity do you have on each rails of final stage ?

I've completed the V4 (50W) with 38Vdc linear psu. I have 20000uF on each rails, and I noticed 0.1V of voltage ripple. I was wondering how it impacts the sounds quality and if I should do something about it, (increasing caps values, switching to SMPS, or maybe separated PSU like you did).
 
shaan

shaan

Member
Joined 2009
gtose said:
Shaan, got my V4Hs in Friday. As usual, they are gorgeous boards and I’m looking forward to a fun build! I’ll be using 2x of Prasi/Project16’s CRC PSUs loaded up with 66mf/rail/channel for a dual mono setup.

One question about the BOM, is it possible to use 500v silver mica instead of the 1000v ceramics?

Thanks!
Greg
Click to expand...

Woah! Them BIG silos sir!

Yes MICA is MOST welcome.

ckwong99 said:
Hi Shaan ,finally i completed my V4H at 35Vdc with 500mA per each power FET. The sound very nice and open , the bass low band very good and punch. High-Mid band is crystal clear.
Again, i much appreciate your support and strive for this project
Click to expand...

Wow that's a very pretty case, and great insides too! Congrats! Please do share some more pictures when you have free time.

Thanks for your interest in peeceebee and I am very happy that you like its sound.

Oracle1 said:
Shaan may i ask. If i have a transformer with 2x35v 250W, is there a problem for one channel?
Click to expand...

For V4H no problemo. For V4 it is a little too high.

Harry3 said:
Hi Shaan,
I got the boards. Good quality! Thanks.
Do you use a coil on the output? If so, where?
Click to expand...

Great to know you got the boards. There are no coils at output. You can use one off-board if necessary for your application. Typical 10uH in parallel with 10R resistors will be fine.

vallickad said:
Hi Shaan,
Can you send two boards and associated components?
Regards
Click to expand...

Yes I can. You will have PM shortly with cost details.

........................................

I am sorry for the late responses. Sprained my lower back a week ago from prolonged sitting and then suddenly trying to get up. Today I'm sitting comfortably on the chair and walking well, so went to the market, bought a few components and now typing. :)
 
Vunce

Vunce

Member
Joined 2014
Paid Member
........................................

I am sorry for the late responses. Sprained my lower back a week ago from prolonged sitting and then suddenly trying to get up. Today I'm sitting comfortably on the chair and walking well, so went to the market, bought a few components and now typing. :)[/QUOTE]

Shaan,
Back pain is a very tricky issue,
I wish you a speedy recovery :)

:cheers:
 
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ckwong99

Member
Joined 2005
Yes the speaker protection associated on the main dc recitifier for backend. U can see the picture
And the frontend , i use shunt type dc regulated supply with 30mA current (per each channel) backup real time, which is in parallel to the load.
 

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H

Harry3

Member
Joined 2005
ckwong99 said:
Yes the speaker protection associated on the main dc recitifier for backend. U can see the picture
And the frontend , i use shunt type dc regulated supply with 30mA current (per each channel) backup real time, which is in parallel to the load.
Click to expand...

Hi CK,
I see that you are using a uPC1237 chip and relay for speaker protection.

How are you powering the small transformer(s) for the regulators?
Are you running mains voltage (220Vac) from your power supply chassis into your amp chassis?

Regards
Harry
 
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ckwong99

Member
Joined 2005
My another DIY friend told me the power toroidal and large cap wrapped by copper foil can make background noise more silent. I think so and try on my preamp. The result is better than not wrap version , especially the high band would change more silk and smooth .
Sorry shunt regulated supply i dont have a circuit. I just order the kit .
 
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