Audio Alchemy, Mods Project
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| Pages: (2) [1] 2 ( Go to first unread post ) |    |
Audio Alchemy, Mods Project| clint e. |
Posted: October 15, 2007 09:21 am
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 D161t@L 0N L1N3 / Analog at heart  Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006  |
I already start to make some mods in my AA Dac. I’ve change some caps to better ones from Panasonic.
 Meanwhile, I met a new friend online - in another forum - and he gave some tips for some really great mods mostly concerning the analog opamp output. The AA has an Analog Devices AD746 opamp - rather old - and I will change it for a Burr Brown OPA2107AP with some “small” changes. So here are some pix from part of the project: From the back  From inside with some new Caps  Opamp AD746  The schematics for the new BB OPA2107 opamp  This post has been edited by clint e. on October 16, 2007 06:46 am Attached Image  --------------------   " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
 
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| thedelihaus |
Posted: October 15, 2007 02:57 pm
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 The Black Dahlquist Group: Moderator Posts: 2473 Member No.: 9 Joined: June 30, 2006 |
Awesome project.
I'll follow this closely.  -------------------- What you got back home, lil' sister, to play yer fuzzy warbles on? Pitiful, portable picnic players? Come with uncle & hear all proper! Hear angels trumpets & devils trombones. You are invited!
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| clint e. |
Posted: October 15, 2007 03:21 pm
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Tanx Paul.
I'm not sure yet if i have to make another case for the mods i intent to do...Because as you see the AA case is too small and i have to do some quite a professional soldering in that opamp...  Four caps and two resistors only in pin 4 ...  Also i will try to make another power supply. I'll put the schematics for the PS later on. -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| rroobbcc |
Posted: October 15, 2007 06:41 pm
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 Valued Member  Group: Members Posts: 267 Member No.: 269 Joined: August 09, 2007 |
Looks like an interesting project. Please keep up the posts as you proceed. It would also be interesting to hear the results of some before-and-after listening if you can find someone with an unmodified unit that can be used for direct comparisons. Thanks for sharing.
-------------------- Main 2-channel: Infinity RS 9 Kappa speakers (bi-amped), Adcom GFA-5802 (x2) power amps, Adcom GFP-750 preamp, Adcom GCD-750 CD player, Sony DTC-75ES DAT deck, Sony TC-K850ES cassette deck
Home Office: Infinity Modulus satellite speakers, Velodyne F-1200 subwoofer, Adcom GFA-555II power amp, PS Audio 5.6 preamp, Marantz DV6001 DVD/SACD player (as CD Transport), PS Audio Ultralink Two DAC Livingroom: B&W DM601 S3 speakers, Adcom GFA-545II power amp, Adcom GCD-575 CD player Home Theater: B&W LCR 6 S2 (x3) front and center speakers, B&W DM 602 (x4) side and rear surround speakers, Polk Audio PSW1000 (x2) subwoofers (driven passively), Triad PowerSub Bronze Amplifiers (x2), Infinity SSW-212 subwoofer, Marantz SR7001 THX receiver, Marantz DV7001 DVD/SACD player, Marantz VP4001 DLP projector, Elite Screens 100" screen Not Currently In Use: Klipsch Forte II speakers, Carver CT-7 preamp/tuner, Carver TL-3220 CD player, Adcom GFA-555 power amp, Adcom GFA-545II power amp, NAD PP-2 phono preamp (clint e. mod'd from ST 2008 New Year's giveaway) |
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| clint e. |
Posted: October 16, 2007 06:39 am
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Tanx rroobbcc.
Soon i'll ordered the components and start doing the mods i keep you guys posted. The AA Power Supply project schematic  This post has been edited by clint e. on October 16, 2007 06:47 am Attached Image  -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| clint e. |
Posted: October 16, 2007 05:01 pm
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Suddently i remember that you can order a free sample from the guys at Texas Instruments : http://www.ti.com/ I'll ask them if they send me an opamp sample...
Attached Image  -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| clint e. |
Posted: November 20, 2007 06:40 am
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
I have recap the rest of the 220uF eCaps this time with Nichicon Ultra-Low Impedance e.Caps, and again a small improvement in the lows and a better smooth highs freqs.
Since i can not find opamp 2107 anywhere  i already ordered Burr Brown OPA2134 and National LM4562 to has the chance to find witch one suits better in the Alchemy dac.Personally, i have great expectations concerning LM4562. Meanwhile i also ordered the few components for the new power supply. The project goes slow, but forward.  -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| clint e. |
Posted: February 03, 2008 04:57 am
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
A step back...
 I’d heard that it happens to others before, well yesterday it happens to me. I screw up a little segment of the AA pcb circuit board. Damned, Damned, Damned!!!I was desoldering a cap, my youngest son made a small cut in he’s hand, I look at him to see what happened, than a look at the solder iron and I have part of the circuit on the iron…  I felt like was kicking in the balls… I have done hundreds of soldering and desolderings, and none of this happens before… Of course I tried to solder again the small segment of the circuit, but it was all in vain… I have my Power Supply concluded next week, – it’s been quite difficult to find a +15 -15 transformer, not to mention the opamps... - and now this… Any tip from you guys will be very helpful. -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| dingus |
Posted: February 03, 2008 08:27 am
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 How can people be so cruel? Group: Admin Posts: 4731 Member No.: 3 Joined: June 29, 2006 |
ah, i hate when that happens (even though i've never worked on a circuit board before).
i wouldnt know the first thing about where to go from here, but maybe this will help? http://www.circuitrework.com/guides/guides.shtml -------------------- Teledyne AR9, Yamaha B-2x, Yamaha M-2, Hafler DH-110, EAD DSP 1000, Wadia WT-3200.
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| clint e. |
Posted: February 03, 2008 12:53 pm
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Tanx Scott. Great link.
 -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| clint e. |
Posted: February 16, 2008 07:14 am
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Well, i manage to repair the AA pcb circuit that was broken!
 The pics speaks for themselves:     -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| dingus |
Posted: February 16, 2008 06:49 pm
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How can people be so cruel? Group: Admin Posts: 4731 Member No.: 3 Joined: June 29, 2006 |
way to go Alvaro.
-------------------- Teledyne AR9, Yamaha B-2x, Yamaha M-2, Hafler DH-110, EAD DSP 1000, Wadia WT-3200.
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| hifi_nut |
Posted: February 17, 2008 05:40 am
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 Giving it another try  Group: Charter Member Posts: 3382 Member No.: 6 Joined: June 30, 2006 |
Outstanding job, Alvaro.
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| clint e. |
Posted: February 17, 2008 07:26 am
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D161t@L 0N L1N3 / Analog at heart Group: Moderator Posts: 6082 Member No.: 40 Joined: July 13, 2006 |
Many tanx guys.
It was not an easy thing to do...lots of patience and nerves of steel  , other wise all the hours and work and money invested on this baby were all down the drain. Besides i have to drill a small hole 0,5 mm in the pcb to reach the broken link in the SAA chip dac. Tanx God, everything turns out fine.  -------------------- " Not everything that can be counted counts, and not everything that counts can be measured " Albert Einstein |
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| thedelihaus |
Posted: February 17, 2008 10:01 am
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The Black Dahlquist Group: Moderator Posts: 2473 Member No.: 9 Joined: June 30, 2006 |
oh, that's such good news!
Remember my offer- if you ever catch a DTI or a second DAC here on american eBay or Audiogon, I'll gladly help broker the deal for you. The DTIs have been going for around $125 before shipping, with only one going for just under $70 a day or two ago. I thought with the large amount of bids on it, it'd have sold higher. I've seen a few Theta digital jitter reducers as well. alvarro, have you had any issues with the Audio alchemy DAC humming? It'd be a low-level hum. Very minor. I'm trying to figure out if it's the unit people sometimes have issue with, or if it's the power supply? -------------------- What you got back home, lil' sister, to play yer fuzzy warbles on? Pitiful, portable picnic players? Come with uncle & hear all proper! Hear angels trumpets & devils trombones. You are invited!
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