DACalito - transversal modification of DAC-AH Lite - diyAudio
Go Back   Home > Forums > Blogs > abraxalito
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Rate this Entry

DACalito - transversal modification of DAC-AH Lite

Posted 30th April 2012 at 06:46 AM by abraxalito

Plenty of audio DIYers have discovered what an excellent modding base the DAC-AH Lite is. I'm a latecomer to the party, but better late than never here's my contribution to the art of DAC-AH-alikes.

Most of the mods I've seen focus on the output stage, some upgrade the PSUs. Here's yet another variant - change the DACs. The TDA1545 is pin compatible with the TDA1543 so I swapped out 8 TDA1543s and replaced them with 8 DAC-stacks made up of 5 TDA1545s each. 32 DACs in parallel produce the normal NOS output, the additional 8 DACs are fed from a two-stage delay line (16 74HC595s) to correct for the zero-order hold. I/V conversion is done passively and differential - 1.3ohms in each polarity. The post I/V stage is a pair of AD605s giving a true differential output. In between the two is a passive filter made up of TDK ferrite beads and NP0 capacitors.

How does it all sound? - well of course one is always biassed when describing one's own offspring, but in a word - dynamic. Or if you prefer the vernacular - dynamite
Attached Thumbnails
Click image for larger version

Name:	P1010072.JPG
Views:	1852
Size:	686.1 KB
ID:	661   Click image for larger version

Name:	P1010060.JPG
Views:	2147
Size:	712.6 KB
ID:	662  
Views 3208 Comments 2
Total Comments 2

Comments

  1. Old Comment
    Tam Lin's Avatar
    For 64-bit shifting consider the HC7731. Add an HC175 to mimic the operation of up to 32 HC595 with the bonus of true/complement outputs.
    permalink
    Posted 15th June 2012 at 02:32 PM by Tam Lin Tam Lin is offline
  2. Old Comment
    abraxalito's Avatar
    Thanks, I was aware of that one. Its a lot quicker to wire up than 595s for sure, but rather more pricey...
    permalink
    Posted 16th June 2012 at 01:01 AM by abraxalito abraxalito is offline
 
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 09:08 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki