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Old 20th May 2006, 09:14 PM   #1
gevorg is offline gevorg  Armenia
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Default How to connect a battery to a TEAC?

Hi all,

I want to replace the power-supply in TEAC A-L700P, to a battery. I'm not a experienced diyer, so all I want to do is connect the battery to the mainboard, just like current PS does. I guess I need to cut out the connector on the other side of the power cable which is going from the mainboard and connect it to switch in the front, which will be connected to the battery terminals. Where can I buy a battery for this and how exactly do I connect it to the mainboard? What is the easy to mod way to charge that battery?

Here is a picture of the Teac.
Click the image to open in full size.
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Old 21st May 2006, 04:36 PM   #2
Puffin is offline Puffin  United Kingdom
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Why do want to do that ? It looks like it has a switch mode power supply which they have probably selected as being a good match for the Class D chips.
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Old 21st May 2006, 05:21 PM   #3
Eva is offline Eva  Spain
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What does make you think that the regulated switching mode power supply is the weak component there?
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Old 21st May 2006, 06:03 PM   #4
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Unless your looking to make something thats portable, I see no advantage of replacing the switching supply with a battery.
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Old 22nd May 2006, 06:26 AM   #5
gevorg is offline gevorg  Armenia
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One diyer, RedWineAudio, made that mod in addition to many others, and there were dozens of users that could hear a great improvement in powering the Teac by battery.
For more info, see here:
http://www.redwineaudio.com/Teac_AL700P_mods.html
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Old 22nd May 2006, 11:22 AM   #6
Pano is online now Pano  United States
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SLAs are cool, but they aren't that much quieter than a SMPS - when the amp is running. The switch mode amps kick back tons of noise onto the power rail. An SLA battery doesn't do any better at handling this noise than a good linear supply or a filtered SMPS. It can be better at some frequencies, worse at others.

Batteries are very quiet with no load. Small loads like preamps are well suited to batteries.

I have a lot of PSU measurements to post and will do so as soon as I clear my amp work backlog. Maybe this week.
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Old 22nd May 2006, 11:55 AM   #7
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The thing about a battery supply that puts me off is the constantly fluctuating and decreasing voltage, not to mention the hassle of a charging system, limited runtime, size, etc. etc..

Besides, what better way to complement a switching amp than with a switching supply.

Maybe theres something about the supply in the TEAC thats not up to par, but its not the fact that its a switching supply.
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Old 24th May 2006, 07:11 AM   #8
gevorg is offline gevorg  Armenia
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Then how can I improve power? What about regulated PS?
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Old 24th May 2006, 03:30 PM   #9
Eva is offline Eva  Spain
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That SMPS seems already regulated, not to mention that it has several outputs.
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Old 25th May 2006, 07:57 AM   #10
gevorg is offline gevorg  Armenia
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So that power is "audiophile grade"? No way to improve it by much?
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