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CRC Power Supply (Class A amplifier)

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#262
GB-1 status update

GB-1 Status update

kindly update your pcb delivery here or just inform me through PM.

mcandmar (4 boards) ok, delivered
Project16 (2 boards) ok, delivered
Myint67 (6 board ) ok, delivered
gwrskien (10 boards) ok, delivered
asuslover (4 boards)ok, delivered
Morde (2 boards) ok, delivered
Ryssen (2 boards) ok, delivered
Marra (4 boards) ok, delivered
gnomcat (10 boards) ok, delivered
bloozestringer (4 boards) ok, delivered
bOTL (10 boards) ok, delivered
Prasi (2 boards) ok
emynet (2 boards)ok, shipped, delivered
Sadik (2 boards)ok, delivered

zrxshack (4 boards) ok, delivered
patriz (4 boards) ok , delivered
JJGB (6 boards) ok, delivered
rephil (10 boards)ok, delivered
mituisho (4 boards) ok, delivered
Pepperman (4 boards) ok, delivered
Nounouchet (4 boards) ok, shipped
Joca (4 boards) ok, shipped, (with customs)
883bkong(4 boards) ok, delivered
bk856er(2 boards) ok, delivered
quan (4 boards) ok, delivered
oceanpeak (8 boards) ok, shipped

joshvi (4 boards) ok, delivered
TIC37 (4 boards)ok, delivered

gabbar (4 boards) ok delivered*
bogde (2 boards) ok, delivered
PauloPT (2 boards) ok, delivered
Algar_emi (2 boards) ok, shipped
 
#263
GB-2 Status update

GB-2
aubmar (4 boards) ok, shipped
jkjkaufm (6 boards) ok, shipped
pesve (4 boards) ok, shipped
manniraj (4 boards) ok, delivered
outtek (4 boards) ok, shipped
Master Pain (2 boards) ok, delivered
bandol83 (4 boards) OK. shipped
prasi+friends (6 boards) ok
cgraf (2 boards), ok, shipped
baggerbole (4 boards), ok, shipped
zman01 (2 boards), ok, shipped
Johnny Canuck (2 boards), ok, shipped
AVWERK (4 boards), ok, shipped
Hui13 (2 boards), ok, ships tomorrow

0 boards remain.

As of now, there is no plan to manufacture these 'limited edition' boards😉

reg
Prasi
 
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#265
PauloPT said:
Hi,

Are there caps compatible with the boards?

ESMH630VQT333MB80T
Click to expand...

HiPaulo,
Those are 5 pin caps (VQT series), the board is made for 4 pin caps, hence VQT cant be fitted.
Out of the series in the datasheet, VSN, VNN,VRD, VND, VQD are compatible with the board.

reg
Prasi

P.S. Project 16 is developing a new CRC PSU for 5 pin, 4 pin, 2 pin all typesof caps upto 40mm dia, as posted by him some pages back.
 
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#268
Project16 said:
Hello everyone

A version that will accept 5-pin capacitors and TO247 diodes is being developed.
It would be interesting for me to have feedback from those who have assembled this PCB for the diameter of the holes to be modified possibly.

Thank you. 🙂

PS: Prasi, this buying group has been led from master's hand!:up:
Click to expand...

I found the post 🙂

Hi Project16,

How is the development of this new board going?

Thanks!
 
#270
Here is my build. Using MUR880, 0.1uF 100v CBB MKT at each diode, 0.1uF 450v CBB MKT and 10R 1W snubber, 22,000uF 35v Cornell Dubelier caps, Panasonic. 0.47R 3W thin film resistors x 2, white LEDs and 6k8 resistors, 2k2 2W bleed off resistors, 0.1uF 100v CBB MKT and 10R 1W output snubbers.

The PCB is very well made. I have never seen such a thick FRP board before. The traces are also thick copper. Everything fit perfectly. I tested with 400VA 18V toroidal trafo and got +/-24.2v and 7mV ripple no load.
 

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#271
That looks fantastic xrk971! 🙂

How did you calculate the output snubbers? I plan to build a quasimodo to figure out the values of the input snubber but how did you do for the outputs?

Is your board for a class A amp? What bias?
 
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#272
xrk971 said:
The PCB is very well made. I have never seen such a thick FRP board before. The traces are also thick copper. Everything fit perfectly. I tested with 400VA 18V toroidal trafo and got +/-24.2v and 7mV ripple no load.
Click to expand...

Credit goes to Prasi for ordering a high quality PCB for the GB - thanks Prasi!

Very neatly assembled X. 🙂
 
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#274
xrk971 said:
Here is my build. Using MUR880, 0.1uF 100v CBB MKT at each diode, 0.1uF 450v CBB MKT and 10R 1W snubber, 22,000uF 35v Cornell Dubelier caps, Panasonic. 0.47R 3W thin film resistors x 2, white LEDs and 6k8 resistors, 2k2 2W bleed off resistors, 0.1uF 100v CBB MKT and 10R 1W output snubbers.

The PCB is very well made. I have never seen such a thick FRP board before. The traces are also thick copper. Everything fit perfectly. I tested with 400VA 18V toroidal trafo and got +/-24.2v and 7mV ripple no load.
Click to expand...

I do not know why DIYA didnt gave me updates in this thread, but wow!.
That looks like a commercial product right out of magazine pages... Very very nice build and nice photography skills xrk. Congratulations.

regards
Prasi

P.S. Thanks all for compliments but it goes out to Project16 for design and the PCB manufacturer, I was just a facilitator.
 
#276
@PaoloPT:

How did you calculate the output snubbers? I plan to build a quasimodo to figure out the values of the input snubber but how did you do for the outputs?
Click to expand...

I didn't. 😛 Although 0,1uF and 10R should absorb most RF > 200kHz, maybe not "critically" absorbed.

Is your board for a class A amp? What bias?
Click to expand...
Yes, it is the Pass M2, as a test case, preparing PSU for a ZenMod Babelfish J. As with most Pass Class A amps, the supply is meant for 24v rails at 1.25amps. My toroidal trafo seems to be having an issue generating a strange hash of noise. I have been debugging it for some time now and have a thread here:

http://www.diyaudio.com/forums/power-supplies/306411-strange-forest-noise-linear-psu.html

It seems the trafo might be saturated as my mains are 123vac and design spec was 115vac. It's an Antek - which I have been very happy with in general as they have great selection and very reasonable prices. This new CRC board does no better than my P2P CRC (really did not expect it to - but was hopeful).

Here is P2P CRC:
611266d1492065840-strange-forest-noise-linear-psu-psu-crc-rev3-closeup.jpg


@Prasi:
Code: 
That looks like a commercial product right out of magazine pages...

Thanks! Makes you want to buy one doesn't it?
 
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#278
yep xrk,
makes me wanna buy it alright. whats the price😉:lickface::lickface:?, Do try the quasimodo procedure, if you have resources.
Looking at the photos that I shared when testing this PCB(before production), I wonder why all these people even trusted me to supply a good product. I should sharpen my skills with my Canon SLR that's gathering dust, may be change lens!.
reg
Prasi
P.S. Don't believe Project16, he is too humble, its all his work!🙂
 
#279
makes me wanna buy it alright. whats the price?
Click to expand...

For everyone else $150, but for YOU my friend, only $60! 😉 😀

I just used up all my TO220 heatsinks on this beast. Just ordered a bunch more - but black anodized and bigger this time. They get hot at 2w dissipation each for 2.5amps.

Don't use SLR - use your phone's cam (short focal length so depth of field is very good) and a sheet of white bond paper to place it on.

Let's look at this pix again (sorry about the large size - click browser refresh button to make small):

611441d1492171947-crc-power-supply-class-amplifier-img_6578.jpg
 
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