How to connect a battery to a TEAC?

gevorg · 20th May 2006, 09:14 PM

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.

Puffin · 21st May 2006, 04:36 PM

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.

Eva · 21st May 2006, 05:21 PM

What does make you think that the regulated switching mode power supply is the weak component there?

theAnonymous1 · 21st May 2006, 06:03 PM

Unless your looking to make something thats portable, I see no advantage of replacing the switching supply with a battery.

gevorg · 22nd May 2006, 06:26 AM

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

Pano · 22nd May 2006, 11:22 AM

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.

theAnonymous1 · 22nd May 2006, 11:55 AM

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.

gevorg · 24th May 2006, 07:11 AM

Then how can I improve power? What about regulated PS?

Eva · 24th May 2006, 03:30 PM

That SMPS seems already regulated, not to mention that it has several outputs.

gevorg · 25th May 2006, 07:57 AM

So that power is "audiophile grade"? No way to improve it by much?

20th May 2006, 09:14 PM	#1
gevorg diyAudio Member Join Date: May 2006	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.

21st May 2006, 05:21 PM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	What does make you think that the regulated switching mode power supply is the weak component there? __________________ I use to feel like the small child in The Emperor's New Clothes tale

22nd May 2006, 11:22 AM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	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. __________________ Take the Speaker Voltage Test!

24th May 2006, 03:30 PM	#9
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	That SMPS seems already regulated, not to mention that it has several outputs. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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21st May 2006, 04:36 PM	#2
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	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.

21st May 2006, 06:03 PM	#4
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Unless your looking to make something thats portable, I see no advantage of replacing the switching supply with a battery.

22nd May 2006, 06:26 AM	#5
gevorg diyAudio Member Join Date: May 2006	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

22nd May 2006, 11:55 AM	#7
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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.

24th May 2006, 07:11 AM	#8
gevorg diyAudio Member Join Date: May 2006	Then how can I improve power? What about regulated PS?

25th May 2006, 07:57 AM	#10
gevorg diyAudio Member Join Date: May 2006	So that power is "audiophile grade"? No way to improve it by much?

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