PPA Build

[ginettaman 0]

Hi,

Didn't want to hijack huangyong's build post, but wanted show some pictures of my PPA build.

 

Still not complete, but nearly there.

 

have used Panasonic FC 470uf & 220uf capacitors, Koa Speer resistors, and have socketed the Gain resistors. I did get some ELNA Cerafine caps but have decided to keep them for a PPA2 or M3.

 

As you see I have socketed the input, LED, power and switch for easy maintenance if needed. Still have to fit the Alps pot.

 

 

 

Edited April 3, 2005 by ginettaman

[digi01 0]

have you cut the R channel's output pad?there are bug.

 

 

P.S.

good case,looks pleasure go ahead.

 

BTW.

I am going to make some solid buffer for roll ha3-5002.

 

your friend,Z

Edited April 4, 2005 by digi01

[heady 0]

digi, I think ginettaman is using the original PPA v1.1 board.

[digi01 0]

the pad of poi of the original board is only for ALPS27.

[ginettaman 0]

Digi's right its the board from huangyong, but I hope he means cut the pad on the "Right Channel"

 

The case is a Hammond Engineering, about the only descent case you can get in the UK, personally I prefer the aluminum heastsink cases Digi uses.

 

Zang, when you say solid buffers, do you mean like the "Glassman" buffers, if so I would defiantly have a set of boards for them.

 

Alan.

[digi01 0]

yes,Right Channel(RO) near the power input location.you should cut the top layer copper and bottom layer copper of "RO".

 

my solid buffer is design for generic use.there are 2 design,SIP(system in package)01 & SIP02.

 

SIP01 can roll OPA633 or HA3-5002,12 pcs HA3-5002 is too costly.I am glad to send 3 sets of these unit for your tryout.

 

SIP02 can roll BUF634,pdip packaged.the buffer's bias is adjustable.

[ginettaman 0]

Zang,

 

how many buffers does your sip01/02 use?

 

Alan.

[digi01 0]

SIP01 is a single buffer,but very small,only 14x18mm.the project is still in progress.thanks.

 

Z

[huangyong 0]

Wow, looks as cool as mine, i like that casing. wonder which model can fit the board?

btw, what diode you use for power protection?

 

[ginettaman 0]

huangyong,

 

Using a 50v 1.0A General Purpose Rectifier Diode, 1N4001 as Tangents part list.

 

The case is a Hammond Engineering part no: 1455N1601

 

Have you got any further with yours, and do you know if anyone has completed from the boards you sold?

 

Alan.

 

 

[digi01 0]

any update?

 

P.S.

the buffer is well done!

 

url at:

 

http://digi01.hk.st

 

 

[huangyong 0]

digi01, it looks cool, i need 3.. thanks.

[huangyong 0]

ginettaman, so far a few people from china had completed the amp with the same board, no serious problem occur.

[huangyong 0]

the hammond case cost 39!!! (farnell), but no choice... that's the best case..

btw, what kind of dc jack u use?

[ginettaman 0]

I'm using a plastic cased insulated DC jack.

 

I haven’t finished my amp yet, but have had it bench tested just using opa134pa's

The Hammond case is about the same price in the UK, I paid £10.95 for mine with the metal ends.

 

Have you got yours up and running yet?