Alright, ... I'm semi coherent... Just a disclaimer... but still. I'm REAL impressed with this battery front end, a la Quickie. .. I tell you. The Q is not, by any means the weakest link. Everything cont to get better with it in the circuit. Anyway... Full digital front end with the Q. All battery. Awesome. The reason for the post. I just got a RCA to RCA adapter for the usb/spdif to to rca dac. Thus getting rid of the cable. All good....
Killer front end...
- Thread starter earwaxxer
- Start date
4
4krow
Guest
heres the deal, the more battery run stuff the better.
True Greg... Dollar for dollar, battery is definitely the best bet IMO. It gets a bit limited when you need major amounts of power. For the DAC and pre. IMO, its the way to go. Get a DAC that runs off a wall wart. Build a pack that does the deal. In the interest of disclosure though, the Wrd4snd USB/SPDIF converter sounds SOMEWHAT better with battery, though, not night and day. Same with the FiiO DAC. Not huge, but preferred for sure. Cleaner, IMO. I could live with both...
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4krow
Guest
Wasn't it the Boulder amp co. in Colorado that produced a battery powered power amp? Don't know the wattage.
Grainger49
New member
Just for yucks, try this. If you have a balanced battery supply, plus and minus the same voltage, put hand matched 10k, or 5k Ohm resistors, matched to the last digit on your meter, across the two supplies. This will hold the voltage matched. Then bypass each resistor with a nice film cap. A 0.1uF will be sufficient. No need to match the capacitors.
Jumpers here are fine. Let us know if that makes a difference.
Jumpers here are fine. Let us know if that makes a difference.
Hey Granger - If you could give some more info about what you are saying that would be interesting. Like, what does the resistor filter, and at what values etc. Paul had recommended putting a cap across the power supply in parallel. I tried that once and didnt notice any change. - thanks - Eric
Grainger49
New member
The resistors lock the voltages, the capacitors will filter any noise.
Do you use a balanced voltage power supply, like +/-9V?
Do you use a balanced voltage power supply, like +/-9V?
Grainger49
New member
John has it. It is complementary voltages with a virtual ground between them.
ALL212
New member
Grainger49 said:
Grainger - can something similar be done for the wall wart switching power supplies? And, if so, do we need to consider the size of the resistor/cap in watts? Those Pass amps I built have 19v, 2amp wall warts - keeps the build simpler and keeps those of us who can tell which end of the soldering iron is hot but not much more from killing ourselves on straight AC. If Nelson Pass approves you have to approve :
but I like to tinker!Grainger49
New member
Yes, it will work but I would go with a three pin regulator for the Pass amps. Much better. What I suggested was cheap for a battery supply. It isn't really an active regulator.
