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In Reply to: Ack DAC powered with very high quality battery like Optima Yellow. posted by beppe61 on December 15, 2006 at 12:16:05:
My Ack Dack runs on very large batteries provided by Reference Audio Mods. I don't know the name of them (I believe there are two of them). They did some mods of my Dack 2.0 and then later I had them make me a battery pack (in a oak box) that connects via a short umbilical to my Ack.I've listened to four dacs in my home- Ack, Benchmark, Lavry, Monarch M24 - and my Bolder modified Squeezebox (via analog outs and upgraded power supply). None of them is as good as my modded Ack Dack with the upgraded batteries. It sounds very full and incredibly natural.
Follow Ups:
Thank you very much for your very interesting reply.
Reading here and there I have come to the conclusion that a power supply based on high quality batteries, like the Optima ones, is the very best solution for digital equipment.
I have the feeling that the both SPDIF receiver and the dac in particular benefit from a steady and clean DC voltage.
Actually I would like to modify a cheap dac I have powering these two chips with a 12V battery.
Nevertheless I wonder if a lower quality/Ah battery but with a very big uF cap in parallel would give the same result.Thank you very much indeed.
Kind regards,beppe
Instead, in order to minimize ESR, try about 45,000uf of small 1500uf or 2200uf Rubycon ZL or equivalent caps in parallel across the battery terminals. This will make a big difference, whether with small or even with large low-impedance batteries. For example:http://cgi.ebay.com/Electrolytic-Capacitor-1500uF-16V-105-C_W0QQitemZ7612056668QQihZ017QQcategoryZ111603QQrdZ1QQcmdZViewItem
Dear Mr Garretson,
thank you so much for your very kind and helpful advice.
It seems to me that batteries are the way to go with digital chips.
I feel they are extremely sensitive to power supply quality/noise.
Even more than analog circuitry.
Actually I have an idea: to try to power only the digital chips (spdif reciever and dac) in my cheap dac (a Behringer src 2496) with a 12 V lead battery.
I am afraid this will take some time but I really think I will try.
Thanks again and kind regards,
beppe
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