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Old 24th February 2004, 09:51 PM   #1
medum is offline medum  Denmark
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Default battery power versus trditional power

I'd like to start a new thread on battery powering.

Advantages and disadvantages?
Has anybody here done some research?

I'm working on a project, where I will keep the cirquits heated by traditional power while I'm charging my batteries and then switch to batteries when playing. I plan to put batteries to my preamp, my active x-over and my RIAA-MC preamp.

Jørn


on the picture you see my current battery powered x-over (L C Audio - modified)
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Old 26th February 2004, 12:29 PM   #2
paulb is offline paulb  Canada
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This thread died pretty quickly...
Mercator and I are considering building a battery-powered preamp. The battery part of the circuit design is straightforward, but the question is, is it worth the additional complexity?
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Old 26th February 2004, 01:45 PM   #3
medum is offline medum  Denmark
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Sorry for double-posting......


"This thread died pretty quickly..."

Thought so myself, but maybe the discussion have been here long before I came in......... anyway, I could'nt find it!

"The battery part of the circuit design is straightforward"

Sure - my addition is, that I designed a kind of mutiplexer, so I can charge 4 x 12V batteries in series one by one using only one charger.

"but the question is, is it worth the additional complexity?"

I think so - the circuits will stay heated, and there will be no warm-up time - in my opinion this will give the best performance.

On the picture: left - slow multiplexer circuit - 15 minutes pr battery) / right - charger (Velleman kit)

Jørn
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Old 26th February 2004, 05:50 PM   #4
sreten is offline sreten  United Kingdom
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I had a battery powered pre-amp, fairly simple arrangement.

But the circuitry was so simple PSRR was probably non-existant.

So I'd say it depends on the type of your preamps circuitry.

sreten.
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Old 26th February 2004, 09:20 PM   #5
paulb is offline paulb  Canada
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Quote:
Originally posted by medum
...... my addition is, that I designed a kind of mutiplexer, so I can charge 4 x 12V batteries in series one by one using only one charger.

"but the question is, is it worth the additional complexity?"

I think so - the circuits will stay heated, and there will be no warm-up time - in my opinion this will give the best performance.
I was just thinking of float charging 3 batteries in parallel (if preamp is off), or place them in series if preamp is on. I'd use a supply splitter to derive a ground.
Charging power would be used for running control circuitry when the preamp is on.
But I wonder if it would sound that much better? Preamp will use OPA2134 or similar opamps.
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Old 26th February 2004, 09:30 PM   #6
sreten is offline sreten  United Kingdom
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JMO but with advanced op-amps and a good supply - no its not worth it.

sreten.
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Old 26th February 2004, 09:50 PM   #7
medum is offline medum  Denmark
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Quote:
Originally posted by paulb

........Charging power would be used for running control circuitry when the preamp is on.
But I wonder if it would sound that much better? Preamp will use OPA2134 or similar opamps.

I'm actually playing my cd-player through an old Noble pot into an electronic x-over. High Pass filter wth discrete components and low pass with LM6172 op-amps. I've tried without and with the battery supply.
Even my old ears tells me, that sound has improved quite much. My daughter - musician with very good ears - said "what happened - it's like if the scene has become much deeper"
So I can only say: Try it
I'll post the schematic for the "multiplexer" soon. Have to convert it to a readable format first.

by the way - very nice to hear from you out there!

Jørn


on the picture: frontpanels from Schaeffer Apparatebau, Berlin
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Old 26th February 2004, 10:01 PM   #8
medum is offline medum  Denmark
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Quote:
Originally posted by sreten
JMO but with ............

Sorry sreten, I'm not sure what JMO means, I'm danish. Please spell that out for me.

Jørn
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Old 26th February 2004, 10:03 PM   #9
sreten is offline sreten  United Kingdom
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JMO = just my opinion sreten.
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Old 26th February 2004, 10:05 PM   #10
maylar is offline maylar  United States
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I honestly don't see any advantage of batteries at all. I can make a power supply with less than 3 millivolts of noise and ripple if it's required. Plus I get current limiting, remote sense capability, and very low source resistance that doesn't degrade over time. And modern opamps have 100 dB or more of PSRR at powerline frequencies. If you design your circuits such that power supply noise is an issue, that's poor design.

I will use +/- 9 volts occaisionally for utility projects where I want portability and an external power supply would be cumbersome. But designing batteries into a serious project I think is silly.
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