525 build thread
« on: May 23, 2007, 10:20:07 AM »
Let's get started with a BOM

http://www.twin-x.com/groupdiy/albums/userpics/525bomupdt3~0.pdf updated again.

and schematic...

http://www.lazpro.com
I reserve the right to not sell to idiots


okgb

525 build thread
« Reply #1 on: May 23, 2007, 11:04:58 AM »
Nice Work Peter , thanks for your time on that

 Of course it would be good  to order all the parts and be
ready for when the boards come !
GKB Audio / Greg Boboski

Rob Flinn

525 build thread
« Reply #2 on: May 24, 2007, 06:22:12 AM »
Peter (me ol' fruit)

Any chance of having this file in excel spreadsheet format ??  Make it a bit easy when trying to work out the cost of parts etc.
regards Rob

525 build thread
« Reply #3 on: May 24, 2007, 06:24:55 AM »
http://www.lazpro.com
I reserve the right to not sell to idiots

Rob Flinn

525 build thread
« Reply #4 on: May 24, 2007, 07:53:40 AM »
Ta Matey !!
regards Rob

capnspoony

525 build thread
« Reply #5 on: May 24, 2007, 09:10:10 AM »
great!  This should be a breeze  :razz:

--Richie

can't wait for my 8 channels to come
defender of the ancients

hejsan

525 build thread
« Reply #6 on: May 24, 2007, 11:11:11 AM »
cool.
what do all the stars mean?
Just remember -- if the world didn't suck, we would all fall off.
Quote from: "Butterylicious"

525 build thread
« Reply #7 on: May 24, 2007, 03:31:27 PM »
Quote from: "hejsan"
cool.
what do all the stars mean?


Not used
http://www.lazpro.com
I reserve the right to not sell to idiots

rafafredd

525 build thread
« Reply #8 on: May 24, 2007, 04:10:59 PM »
Hey Peter, are you also using a 2520 for the input opamp? These makes for 4 2520s for each unit. Serious job, if all opamps are DIY.

Rob Flinn

525 build thread
« Reply #9 on: May 24, 2007, 07:05:50 PM »
Peter

DO you have a source for the edge connector ??
regards Rob


Ptownkid

525 build thread
« Reply #10 on: May 24, 2007, 10:45:49 PM »
Quote from: "rafafredd"
Hey Peter, are you also using a 2520 for the input opamp? These makes for 4 2520s for each unit. Serious job, if all opamps are DIY.


I think it's 3 per 525...

525 build thread
« Reply #11 on: May 25, 2007, 04:24:33 AM »
Rafa.. copy of a UREI 5 transistor op amp on the front end. Pcb included in the set.

Rob.. No. You're on your own.
http://www.lazpro.com
I reserve the right to not sell to idiots

gyraf

525 build thread
« Reply #12 on: May 25, 2007, 05:50:46 AM »
For A3, the sidechain-transformer driver, it'd probably be enough to use a standard opamp with a couple of BD139/140 power booster transistors.

Question: Why not a simple 10K:10K input transformer instead of additional opamp stuff?

Jakob E.
..note to self: don't let Harman run your company..

525 build thread
« Reply #13 on: May 25, 2007, 05:57:06 AM »
Quote from: "gyraf"

Question: Why not a simple 10K:10K input transformer instead of additional opamp stuff?

Jakob E.


Room on the board Jakob.


Large.. http://www.twin-x.com/groupdiy/albums/userpics/OL.jpg
http://www.lazpro.com
I reserve the right to not sell to idiots

gyraf

525 build thread
« Reply #14 on: May 25, 2007, 09:13:07 AM »
:shock:
..note to self: don't let Harman run your company..

Greg

525 build thread
« Reply #15 on: May 25, 2007, 09:47:41 AM »
Been studying this schem getting ready for the build, and I don't understand what Q5 is doing. Can someone explain?

At first I didn't understand the bias of Q1, but I read the datasheet and it cleared that up.
Greg Stein
New Orleans, LA

rafafredd

525 build thread
« Reply #16 on: May 28, 2007, 03:31:56 PM »
Quote
Rafa.. copy of a UREI 5 transistor op amp on the front end. Pcb included in the set.


Nice. I like that simple opamp, it´s almost the same as the Quad8 AM4. Sounds good, and is very simple.

mnats

525 build thread
« Reply #17 on: May 28, 2007, 05:42:30 PM »
Quote from: "Greg"
Been studying this schem getting ready for the build, and I don't understand what Q5 is doing. Can someone explain?

At first glance it looks like it is adding an AC signal to the gate to reduce distortion.

525 build thread
« Reply #18 on: May 29, 2007, 12:54:10 PM »
They're in....

http://www.lazpro.com
I reserve the right to not sell to idiots

edanderson

ap2623 transformer
« Reply #19 on: May 31, 2007, 09:19:07 AM »
since peter started his project, i've been working on getting some ap2623 type transformers made.  unfortunately, the first supplier i was working with backed out after a few weeks, so now i am a bit behind.

i don't want to discourage anyone from going ahead and buying transformers.  but i should have something good available in a few weeks.  until then, please do not contact me.  as soon as they are available i will post to this thread and post to the black market.

ed


 

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