PRR-176 REV 4 Build Thread ***Manual up!***1/16/14 - (chk 1st post)

[e.oelberg]

Wait a moment abe will upload the schenatics.. there are 4 currents +&-18, 13 and 100 v

 

[abechap024]

Ok. The BOM pdf now has the schematics attached.

www.acsoundstudio.com/diy/prr/prr_rev4/PRR_BOM_Rev4.pdf

 

[ilfungo]

sorry
and the other 50mA is sufficient for all the rest?
Thanks

Hi Abe!!!
50 mA is ok for all Doa?
Thanks

 

[prh]

Ok. The BOM pdf now has the schematics attached.

Thanks Abe  8)

 

[ding]

What are the 8 mounting pins for on middle of the DOA's? Do these need to get put on also? Again I also want to double check that my 1mA meters will work like in Rev2. Also I noticed on the BOM that 4 of those 1000uf caps should be 50v as per the silkscreen and not 25v, is this correct?

 

[abechap024]

What are the 8 mounting pins for on middle of the DOA's? Do these need to get put on also? Again I also want to double check that my 1mA meters will work like in Rev2. Also I noticed on the BOM that 4 of those 1000uf caps should be 50v as per the silkscreen and not 25v, is this correct?

Hi,
Those 8 pins are for if you want to replace some dip 8 opamps...works like a charm in some places...like some consoles. But with this project you could choose to mount them this way or not. doesn't matter.

Your 1ma meter will work just fine

Duh! I need to fix the BOM....yes follow the silk screen. Not a huge deal if you got all 25v but 50v should last a little longer in that position

 

[ding]

Abe what is the diameter on those DOA mounting holes? I'm trying to see if these will fit. They are .062 diameter. Thanks so much.

http://www.mouser.com/Search/ProductDetail.aspx?R=0344-2-19-01-34-27-10-0virtualkey57510000virtualkey575-034420

http://www.mouser.com/Search/ProductDetail.aspx?R=3103-2-00-21-00-00-08-0virtualkey57510000virtualkey575-310320

 

[e.oelberg]

Dip 8 is a cheaper solution fir this project, i take the duo route
And..as the abe's doas anyway have false pinout. The dip8 give you more possibilities

 

[ding]

I'm not sure about cheaper. You get 500 pieces for under $2. Thats enough to make 71 DOA's.

 

[e.oelberg]

really ?

Link ?

 

[ding]

Oops, my bad.  :-[ I saw "factory pack 500" and I got over excited. What header pins are you going to use for the dip8 on the DOAs? Something like this…

http://www.mouser.com/ProductDetail/TE-Connectivity-AMP/9-146276-0/?qs=sGAEpiMZZMs%252bGHln7q6pm8vS1T4l2rafx6YbhZ%252bUi00%3d

Also, I imagine even if I use the dip8 mounting with the DOA's I won't need to solder the 22pf caps.

 

[e.oelberg]

these are square, you want round once like this
http://www.reichelt.de/IC-Sockel/AW-122-20/3/index.html?&ACTION=3&LA=5&ARTICLE=4426&GROUPID=3215&artnr=AW+122%2F20

 

[mrdarwin]

about 2520 DOAs...
what does mean "3k-5k" resistor?
3k? 5k? 4k? which determines this resistor value?

 

[ilfungo]

sorry if I repeat the question
50mA is sufficient for all the ic's?
Thanks

 

[ding]

about 2520 DOAs...
what does mean "3k-5k" resistor?
3k? 5k? 4k? which determines this resistor value?

I just chose 3k but I would be interested in the answer just for curiosities sake.

 

[ilfungo]

If output transformer is used, which components I can omit?
and old question:
50ma is ok for all ic's?
Thanks

 

[abechap024]

If output transformer is used, which components I can omit?
and old question:
50ma is ok for all ic's?
Thanks

You will need more than 50ma for the ics...well I guess depending on what type of ICs you end up using. But just get a big enough transformer and you will be fine. I think I am using a 50VA in one and it doesn't even get warm...

If you use an output transformer you can omit the 5532 output stage and the resistors and caps around it...you can check the schematic or I'll eventually post it in the BOM.

 

[ilfungo]

Thanks Abe
last question 400ma for tube heater is ok?
Thanks

 

[e.oelberg]

look at the schematics and at the data sheet 13 V 300 ma should be enough for two tubes in series

 

[ilfungo]

Thanks to all
problem solved,wrong label.....
by Don audio:

Blue 18v / 0.4A
yellow 18v / 1.2A.
red 120v 50mA.

for me label on my transformer:
Blue 18v / 0.4A
green 18v / 50mA
red 120V/ 1.2A
Sorry and thanks!


P.S. " If you use an output transformer you can omit the 5532 output stage and the resistors and caps around it...you can check the schematic or I'll eventually post it in the BOM.
"
Please!!!
Can you explain the input option?
Thanks