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-   -   Battery powered Balance Line Stage (http://www.diyaudio.com/forums/pass-labs/15517-battery-powered-balance-line-stage.html)

icceman 23rd May 2003 07:38 AM

Battery powered Balance Line Stage
 
I'm thinking of building a battery powered BLS using 10 x 12V 5Ah SLA rechargable batteries. How long can the BLS last on those batteries?

tschrama 23rd May 2003 07:50 AM

Hi,

unless I forget something:

to be on the save side: let's asume 4000mA hours.
The BOSOZ draws about 160mA or the BOZ draws about 100mA. So the BOSOZ will last 4000mA/160mA hours = 25 hours, the BOZ about 40 hours.

Regards,
Thijs

protos 23rd May 2003 11:54 AM

Are these figures for both channels?I think the regulated BOSOZ ps should draw a fair bit of current seeing how hot it gets.With batteries maybe you wouldn't need the regulation and save on battery life. If you want to regulate you will have to adjust to something like 50v to work with your 60v rails.

tschrama 23rd May 2003 12:21 PM

Hi,

Yes these figure are for both channels. I could be a few tens of mA wrong but I don't think so. The active devices in the BOSOZ and BOZ indeed get hot due to the energy the dissipate (say 30V x 50mA = 1.5Watt) in combination with their high 'thermal resistance' which is due to thier low radiating surface. A small heatsink reduces the thermal resistance and hence temperature considerably.

Regards,
Thijs

ralf 23rd May 2003 12:27 PM

good idea..
 
..how will you recharge the batteries?
have you got a charger (schematic of a charger)

Ralf

icceman 23rd May 2003 03:11 PM

I'm presently using a 12V charger that charges 1 battery at a time for my buffered preamp (2 x 12V SLA). I've to find a way to concurrently charge all the 10 batteries (120Vdc). Any suggestions?

ralf 25th May 2003 08:29 AM

time consuming
 
Quote:

Originally posted by icceman
I'm presently using a 12V charger that charges 1 battery at a time for my buffered preamp (2 x 12V SLA). I've to find a way to concurrently charge all the 10 batteries (120Vdc). Any suggestions?
..ohhh,
charging 12 batteries, one after the other - must be very time consuming.

Can you desribe the sound differences between conventional psu and battery supply?

Greets
Ralf

cocolino 25th May 2003 07:10 PM

Quote:

originally posted by tschrama
to be on the save side: let's asume 4000mA hours.
The BOSOZ draws about 160mA or the BOZ draws about 100mA. So the BOSOZ will last 4000mA/160mA hours = 25 hours, the BOZ about 40 hours.
This calculation is true when You discharge the batteries completely.
For long lifespan Sealed Lead Acid batteries don`t like it being discharged completly.
I wouldn`t recommend discharge them under 1/3 their capacity.
So count for less operating time or go for bigger batteries.

Quote:

originally posted by icceman
I'm presently using a 12V charger that charges 1 battery at a time for my buffered preamp (2 x 12V SLA). I've to find a way to concurrently charge all the 10 batteries (120Vdc). Any suggestions?
Yes, use 10 those chargers:) (no joke!)

icceman 26th May 2003 02:33 AM

10 chargers
 
10 chargers! ... I need to reconsider if it's really worth using batteries to power the BLS (batteries VS PSU).

protos 26th May 2003 11:12 AM

I think the BZLS would work quite well on +- 24v , even Nelson has said it can work on 30v so it's not a big difference.
Of course you can up it to +- 36v with six batteries to be on the safe side and build only two chargers each charging 3 batteries.This could be a good compromise even though some do not recommend charging many batteries in series because of different internal R but I think it is not that critical and in the worst case the battery may have a slightly lower life span. In any case the sound quality will not be affected.I found that small voltage differences between battery rails and batteries on my battery powered gainclone do not affect sound quality.
I think you have many options at your disposal.


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