MartyMart

D-AOC PCBs - the building and help Thread
« Reply #120 on: April 01, 2008, 05:46:14 AM »
Here's some Farnell codes for the stuff I ordered for the D_AOC.
It's NOT complete, as I had some things anyway, but hope it helps
save the 2+ hrs that it took me to find it all !!

Capacitors -
100uf 50v ( 35v use ) 969-6660 NOTE this is a "bipolar" and probably wrong - intended for the Pico Comp board
47uf 350v                  969-6440  12 needed
1000uf 25v                969-2193
2200uf 35v                969-2347
3300uf 25v                969-2223
Poly -
0.22uf 400v               116-6132
1uf 400v                    116-6136
0.1uf 400v                 121-5494

Resistors -
470ohms 2 watt          933-8250
2k2 2 watt                  933-8160
10k 2 watt                  933-8063
39k 2 watt                  947-5257
100k 2 watt                933-8071   ( all 10 pieces minimum )
1M trimpot                 935-4328    ( 5 pieces minimum )

Other -
LM350T                      131-7673
TL783CKC                  959-4582
1N5371                        955-8284
1N5400G diode           145-8988
1N4007 diode             146-7514
5w zener 39v              955-8233
Heatsink - undrilled     232-968  ( bigger one to attach to case for heat dissipation !! )
Heatsink - board         121-9493 ( matches board pattern 2 needed )

VTL5C4/2  - ordered from ;  www.smallbearelec.com
Transformer/ solen fast 10uf/ tubes and sockets ordered from
www.musikding.de and found very easily.

Marty.

EDIT - Board arrived whilst typing this :-)
Thanks Volker .
EDIT - I had the numbers spaced out evenly but it goes away in "preview"
and when posted !! - sh*t  !
"Success is the ability to go from one failure to another with no loss of enthusiasm"


Jonkan

D-AOC PCBs - the building and help Thread
« Reply #121 on: April 01, 2008, 08:19:16 AM »
Im cheap, so im going to buy all edcor transformers for this project.
Quick question:
Since the edcor wsm 600:10k transformer in reverse seems to be working fine for the output as shown in the measurements silent:arts provided, is it safe to say that the 10k:600r edcor used in a non reverse configuration will probably work fine here also?

Im trying to work out what to order. Im thinking edcor xs1100 on input, and wsm 10k:600r on output (or 600r:10k reversed).

Thanks!
/J

MartyMart

D-AOC PCBs - the building and help Thread
« Reply #122 on: April 01, 2008, 09:58:29 AM »
OOPS - missed out the 1N5371's from the order, if anyone has 2x spare
could you PM me, I have extra's of several other things so a "postal swop"
would be fine :-)
( all other diodes/2W resistors etc )

Ta,
Marty.
"Success is the ability to go from one failure to another with no loss of enthusiasm"

bernbrue

D-AOC PCBs - the building and help Thread
« Reply #123 on: April 01, 2008, 11:08:56 AM »
Quote from: "sinestaraudio"

no matter how high i drove the input, the output level did not drop when compression knob was turned.

Also I am using 1ma meters which adjusting with the meter trim can only just get off the floor, I am wondering if this might be a clue to whats happening in the GR circuit.


Pete,
I tried a 250uA meter successfully whereas a 1mA meter barely moved. Changing R124/126 might help, although I didn´t test it. As I mentioned earlier, compression is very subtile. Feed the compressor with some percussive sounds (drums) and you´ll hear it. Otherwise check the connection of the input pot.  Don´t forget the red or blue LED parallel to the vactrols LED, as Volker mentioned earlier.
regards
Bernd

D-AOC PCBs - the building and help Thread
« Reply #124 on: April 01, 2008, 11:22:13 AM »
Hi Bernd,

Thanks for your reply and meter info, I will let you know how it goes.

I am really suprised about the quality of the audio specs, I only did a few quick tests, as the input / output amps working wonderfully, and only using the Edcors the response was incredible, I can post some images of the sweeps later.

all the best
Pete

cannikin

D-AOC PCBs - the building and help Thread
« Reply #125 on: April 01, 2008, 11:47:16 AM »
Quote from: "sinestaraudio"

Thanks for your reply and meter info, I will let you know how it goes.


Hey Pete, definitely let us know if changing R124/126 solves the meter issue.
I have a couple 1ma meters that I want to use.

David
Tube limiters..yum!

D-AOC PCBs - the building and help Thread
« Reply #126 on: April 01, 2008, 12:19:56 PM »
hi David,

most certainly will tonight for you.

I was wondering what the reason behind the factor of ten between the values of the two resistors? if any one can shed some light on it that would be interesting.

Pete

D-AOC PCBs - the building and help Thread
« Reply #127 on: April 01, 2008, 12:20:29 PM »
Quote from: "cannikin"

I have a couple 1ma meters that I want to use.

David


Me too.  

bernbrue

D-AOC PCBs - the building and help Thread
« Reply #128 on: April 01, 2008, 12:27:44 PM »
changing resistor values was just a guess, don´t nail me down on that ..
Miko, were do you get those beautiful meters?

MartyMart

D-AOC PCBs - the building and help Thread
« Reply #129 on: April 01, 2008, 12:29:40 PM »
Guys, BOM says 12 x 47uf 350v and the board has 47uf 400v silkscreened !
Can I get away with the 350v caps as they were quite expensive ??
Don't think I can change them as it's a few weeks since I got them.

Ta,
Marty.
"Success is the ability to go from one failure to another with no loss of enthusiasm"


D-AOC PCBs - the building and help Thread
« Reply #130 on: April 01, 2008, 12:30:17 PM »
Cheap on ebay.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=270222836163&ssPageName=STRK:MEWN:IT&ih=017

I just hope they look the same when they come.   :?

[silent:arts]

D-AOC PCBs - the building and help Thread
« Reply #131 on: April 01, 2008, 12:42:22 PM »
Quote from: "MartyMart"
Can I get away with the 350v caps as they were quite expensive ??

all 47uF after the regulator are fine with 350V.
the voltage of C2, C3 & C4 are depending on your Power Transformer.

bernbrue

D-AOC PCBs - the building and help Thread
« Reply #132 on: April 01, 2008, 12:43:22 PM »
Marty,
with 47uF 350V you are just fine, took them as well and mine didn´t blow up.
regards
Bernd

bernbrue

D-AOC PCBs - the building and help Thread
« Reply #133 on: April 01, 2008, 12:43:57 PM »
:grin: the master himself, received the pcb, what a nice sticker, wow.
regards
Bernd

MartyMart

D-AOC PCBs - the building and help Thread
« Reply #134 on: April 01, 2008, 12:45:51 PM »
Thanks  :roll:
`panic attack about £20 worth of caps !!

 :green:
"Success is the ability to go from one failure to another with no loss of enthusiasm"

[silent:arts]

D-AOC PCBs - the building and help Thread
« Reply #135 on: April 01, 2008, 01:01:34 PM »
for the Meter:
the circuit is taken from the LA2A
(which uses a VU Meter)
btw, there is a 3K9 resistor needed in series with the VU which is not on the PCB
(since I wanted to have a switchable "Gain Reduction" / Output VU)

some comments from Keith:
http://www.groupdiy.com/index.php?topic=25646

and how to calibrate it:
http://www.groupdiy.com/index.php?topic=23253.msg276178#msg276178
(R25 = R126 & R226 in the D-AOC)
« Last Edit: September 07, 2009, 05:38:20 AM by [silent:arts] »

MartyMart

D-AOC PCBs - the building and help Thread
« Reply #136 on: April 01, 2008, 01:10:40 PM »
Could I use 2x 39v zener diodes for the 5371's as I happened to order 5watt
versions anyway .. they are a little large !
5371 is 60v and I would have either 39v with one or almost 80v with two.
Or is the application wrong for these ?

MM.[/i]
"Success is the ability to go from one failure to another with no loss of enthusiasm"

Jonkan

D-AOC PCBs - the building and help Thread
« Reply #137 on: April 01, 2008, 02:24:17 PM »
Hey, where is the 5371 diodes mentioned? I cannot find anything about them in the  BOM.

Are they needed for this project, and if so...how many?

/J

bernbrue

D-AOC PCBs - the building and help Thread
« Reply #138 on: April 01, 2008, 02:36:31 PM »
Jonkan,
you´re right, they are not on the BOM. Volker, would you update the pdf file on your server, plz? You need two 1N5371 (Farnell 9558284)
regards
Bernd

[silent:arts]

D-AOC PCBs - the building and help Thread
« Reply #139 on: April 01, 2008, 03:17:28 PM »
I would still prefer the Neon Lamps here ...
for the safety reason (you can see there is power on)

and I haven't tested the 1N5371, neither for PCB spacing nor for the meter circuit.

roughly you want to have 67V. any zener with this specs could be used here.

the board layout is for the Farnell PartNr Bernd posted above (which is a 60V/5Watt Zener btw). I haven't found any closer value while doing the PCB Layout.
one of the reasons the BOM I posted states "incomplete" :oops:


 

Related Topics

  Subject / Started by Replies Last post
11 Replies
2860 Views
Last post November 28, 2008, 04:25:43 AM
by [silent:arts]
25 Replies
7151 Views
Last post August 10, 2011, 10:10:47 PM
by JimiH
5 Replies
1914 Views
Last post December 10, 2009, 05:43:37 PM
by Junction
4 Replies
432 Views
Last post August 13, 2018, 10:11:57 PM
by TDM