Batterysupply for RIAA-stage??

plysch · 18th May 2004, 01:26 PM

Hello fellows

I´ve got an LC-Audio MM-RIAA stage and I would like to replace my existing powersupply to a batterysupply. (just want to see if it does any audiable defferance). It needs +/- 12-17V, on the PCB there are 3 "inputs" marked +13v, -13v and GND. I suppose if I have a battery the +pole goes to +13v, the -pole to -13v, but what about the GND, where do I connect the ground???

SY · 18th May 2004, 01:38 PM

Use two batteries, one from ground to +, the other from ground to -. Naturally, the latter battery has its + terminal grounded, the former has its - terminal grounded.

You could build an active ground, but that's more comlicated than necessary.

Triple check all polarities before switching on your circuit!

C37 · 18th May 2004, 01:44 PM

Hello,
Here's how they do it for DACT:
http://www.soundlabsgroup.com.au/dac...tery_power.htm

plysch · 18th May 2004, 01:57 PM

OK, crystalclear.
Thanks

C37 · 18th May 2004, 02:13 PM

Plysh,

I run a dact Line stage from batteries. Works very nicely. As a little advice don't skip on having 4 capacitors as they decribe in the dact website. Also, i have found out for reason i can't quite explain that bigger batteries make a huge difference in the bass. I am currently using some two 9 Ah 12v Batteries and it's a world of difference with the 4A i was using. 9Ah looks like overkill when you know the power comsumption of these modules , but i found it's very effective.
regards,
T

Werner · 19th May 2004, 06:07 AM

ALW measured lead cells and found them hideously noisy and heavily influenced by the load current, effects of current transients trailing long after the event itself.

I measured alkaline, which is low-noise indeed, and NiCd, which is of slightly higher noise, but suffers from unexplainable transient events once every few milliseconds.

So indeed you need a load of capacitors to get rid of the batteries' crap.

Still have to measure NiMH.

http://www.tnt-audio.com/clinica/reg..._noise4_e.html

18th May 2004, 01:26 PM	#1
plysch diyAudio Member Join Date: Oct 2003 Location: Västergrängsjö	Batterysupply for RIAA-stage?? Hello fellows I´ve got an LC-Audio MM-RIAA stage and I would like to replace my existing powersupply to a batterysupply. (just want to see if it does any audiable defferance). It needs +/- 12-17V, on the PCB there are 3 "inputs" marked +13v, -13v and GND. I suppose if I have a battery the +pole goes to +13v, the -pole to -13v, but what about the GND, where do I connect the ground???

18th May 2004, 01:38 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Use two batteries, one from ground to +, the other from ground to -. Naturally, the latter battery has its + terminal grounded, the former has its - terminal grounded. You could build an active ground, but that's more comlicated than necessary. Triple check all polarities before switching on your circuit! __________________ If there's a sucker born every minute, where do the rest of them come from?

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18th May 2004, 01:44 PM	#3
C37 diyAudio Member Join Date: Mar 2003 Location: Brussels	Hello, Here's how they do it for DACT: http://www.soundlabsgroup.com.au/dac...tery_power.htm

18th May 2004, 01:57 PM	#4
plysch diyAudio Member Join Date: Oct 2003 Location: Västergrängsjö	OK, crystalclear. Thanks

18th May 2004, 02:13 PM	#5
C37 diyAudio Member Join Date: Mar 2003 Location: Brussels	Plysh, I run a dact Line stage from batteries. Works very nicely. As a little advice don't skip on having 4 capacitors as they decribe in the dact website. Also, i have found out for reason i can't quite explain that bigger batteries make a huge difference in the bass. I am currently using some two 9 Ah 12v Batteries and it's a world of difference with the 4A i was using. 9Ah looks like overkill when you know the power comsumption of these modules , but i found it's very effective. regards, T

19th May 2004, 06:07 AM	#6
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	ALW measured lead cells and found them hideously noisy and heavily influenced by the load current, effects of current transients trailing long after the event itself. I measured alkaline, which is low-noise indeed, and NiCd, which is of slightly higher noise, but suffers from unexplainable transient events once every few milliseconds. So indeed you need a load of capacitors to get rid of the batteries' crap. Still have to measure NiMH. http://www.tnt-audio.com/clinica/reg..._noise4_e.html