pelayostyle
100+ Head-Fier
- Joined
- Sep 13, 2006
- Posts
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- 11
Thanks for all your help Kim.
Btw, did you ever do those mods to your dac ?
Btw, did you ever do those mods to your dac ?
Originally Posted by Kim Hardee I'm still waiting for the parts to arrive. I'll probably get around to the mods this weekend. Should be pretty easy. I'll post the results. |
Originally Posted by Kim Hardee I suggest moving the power transformer away from the PC board as I have done. I didn't like how it was pushed up against a bridge rectifier (that got pretty hot) and the capacitor next to the end DAC. Mine is now positioned to the left side (looking from the front) and slightly forward, next to the power switch. |
Originally Posted by Kim Hardee I strongly recommend that other owners of the DAC-AH consider this change, which is very easy, or to replace the LM7806 voltage regulators with LM7808s and run the TDA1543s at 8V. Then the 270 ohm resistors will be fine. The full change is to solder a 470 ohm resistor across R35 and a 470 resistor across R36. Then adjust the VREF trimpot until the outputs of the TDA1543s are at about 3.3V. That's it. If you decide to change the LM7806s to LM7808s, then don't add the 470 ohm resistors and adjust the outputs to about 4.3V. |
Originally Posted by Superpredator I have no idea how to accomplish either of these fixes, and am saddened at the thought that my AH is flawed. |
Originally Posted by pelayostyle Ill be doing the mods hopefully next week as the parts come in and ill take pics of EVERY step as i go along. Ill post the step by steps in this thread with the pics. It should help you fix your dac hopefully. |
Originally Posted by regal This would be very helpful. This DAC has a lot of potential, especially cleaning up the mistakes the Chinese made. |