Prototype DAC PCBs (TDA1541A, TDA1545, AD1865N, 5687) - diyAudio
Go Back   Home > Forums > Commercial Sector > Swap Meet

Swap Meet Sell your stuff here, who knows, some other fanatic might be interested!

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th June 2006, 09:50 PM   #1
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default Prototype DAC PCBs (TDA1541A, TDA1545, AD1865N, 5687)

I have been working on some NOS DAC stuff, and I have some extra circuit boards to sell off as board houses tend to not make just one. There is a TDA1541A based board, a TDA1545 based board, an AD1865 based board, and a 5687 based tube gain stage board.

All three DACs use a transformer input; the ad1865 also uses an active buffer.

The TDA1541A and AD1865 DAC's have spots to use a passive I/V as well as a Bessel or Butterworth filter, or you can bypass one or both parts to use an off board I/V and or filter. The tda1545 board is a bit simpler and has a passive I/V and spots for small coupling caps (Blackgate N series or Nichicon ES 4.7uF.)

The output of the DACs is low and will need some sort of gain stage (tube, opamp, transformer, etc.) though the tda1545's ouput is high enough that in some systems it will work okay on its own.

The tube board is a single 5687 in grounded cathode configuration with a plate load CCS. Output impedence is about 2K, so your next stage should have an input impedence of at least 25K. It would also make a good preamp, and with a little ingenuity can be built up with several different configurations (like a transformer or choke plate load, etc.) Please keep in mind that this project involves high voltages and should only be attempted by someone skilled enough to do so. The tube stage does work pretty well with both the AD1865 board and the 1541 board feeding it.

I have built all of these, so I know they work and I think they sound pretty good, but I can't make any guarantees beyond that. I'll give you a schematic and some basic parts suggestions, but this is DIY so no kits etc. (though if someone wants something totally built, you should contact me and we'll chat.)

I also have a small number of CS8414's, so some boards can come with a CS8414 presoldered.

TDA1541A board: $25 ($37 with a CS8414)
AD1865N board: $25 ($37 with a CS8414)
TDA1545 board: $20 ($32 with a CS8414 -- add $4 for a TDA1545)
5676 board: $25

All prices include paypal charges but shipping is extra. My preference is USPS in a padded envelope, which is generally less than $1.

Images of populated boards are below.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 15th June 2006, 09:18 AM   #2
diyAudio Member
 
Join Date: Nov 2005
About what is the cost of a populated 1541 coming out to be? Then what type of power to throw in?
  Reply With Quote
Old 16th June 2006, 06:00 AM   #3
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Sorry for the slow reply. The 1541 board involves 14 blackgate 0.1uF NX caps which is about $25. The chip itself is $15 and up. The input transformer is about $10 at digikey, the resistors, wima caps, regulators, ferrites, etc. probably add $30 to $40 unless you use over the top parts, then it is more like $50 or $60. Oh, and the cs8414 is $12 at Newark. So, $90 at the low end, maybe $120 at the high end.

For power, you need at least +7V and -17V. +8 and -18 is probably better.


For the 1545, you need about +9V (in fact a 9V battery works, though current draw is about 60mA so it doesn't work for long.) Parts for the 1545 probably cost about $40 to 50 on the low end and could go up to $70 or $80.

The 1865 is likely somewhere in between, though 1865's are getting tricky to find. It is not actually discontinued, but Analog says that it is not recommended for new designs and does not show up for purchase from them. It needs +/- 8V, but the current draw is low enough that +/-18V does not stress the regulators too much.

More info, schematics, board layouts, etc. can be found at http://www.ecp.cc/modular_dac.html

-d
  Reply With Quote
Old 7th July 2006, 02:16 AM   #4
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
I still have 3 TDA1541A boards and 1 TDA1545 board.
  Reply With Quote
Old 8th January 2007, 03:14 PM   #5
diyAudio Member
 
Join Date: Apr 2006
Location: Massapequa, NY
Default 5687 Gain Stage

I am very interested in a 5687 Gain Stage
Are boards and component lists still available?

Thanks,
Steve
  Reply With Quote
Old 16th June 2007, 07:28 AM   #6
diyAudio Member
 
Join Date: Feb 2007
Location: sucy/france
dear sir,

i look with interest your dac with 1865 and i enjoy to build it if i could buy a kit.
Unfortunately, i am still enable to send direct mail to the author
amontef@free.fr FRANCE
  Reply With Quote
Old 23rd July 2007, 08:53 AM   #7
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
I have another round of some of these boards.

3x TDA1541A board
2x AD1865 board
1x 5687 Gain Stage board

All are 2oz copper, immersion silver (RoHS compliant). They are also all green now.

$25 each + shipping.

More info, schematics, board layouts, etc. can be found at http://www.ecp.cc/modular_dac.html

Send email to DAC_boards at ecp.cc

I do not have any extra chips, though Digikey does have the basic version of the AD1865 in stock. I also will not supply any other parts.
  Reply With Quote
Old 23rd July 2007, 09:35 AM   #8
A'af is offline A'af  Indonesia
diyAudio Member
 
A'af's Avatar
 
Join Date: Nov 2001
Location: Indonesia, Jakarta
Just passing by dsavitsk,

i have some IC about dsavitsk design in this link:

FS: assorted NOS DAC part

all the best,
a'af
__________________
“Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.” Buddha
  Reply With Quote
Old 25th July 2007, 07:37 PM   #9
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Remaining boards:

2x AD1865N
1x TDA1541A
  Reply With Quote
Old 4th August 2007, 08:09 AM   #10
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
A couple of boards still available
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Aleph-X PCBs , NIGC PCBs , OPA541AM OpAmps e.lectronick Swap Meet 25 6th March 2013 07:40 PM
NONOS DAC with TDA1541A or AD1865N-K or something better omainik Digital Line Level 5 11th May 2009 07:29 PM
Fs: Tda1541a, Ad1865n-k, Cs8412cp/ip acliao Swap Meet 0 25th March 2009 04:52 AM
FS:AD1865N-K NON OVER SAMPLING DAC 2.1x PROTOTYPE rubydac Swap Meet 5 17th May 2008 02:00 AM
5687 dc 5687 tube amp need help vangogh-hk Tubes / Valves 8 4th January 2006 12:09 AM


New To Site? Need Help?

All times are GMT. The time now is 02:43 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2