Battery Supply Help.

[RichardJones]

Hi,

I need to make a 36-40v 1A supply. Probably use 3 12V SLA batteries.

Should I bypass these batteries? I do have some 50v 68,000uf caps that should work.

Is there anything else I should do? Use a choke? etc..?

suggestions?

Thanks!!!!

 

[cowanrg]

i always thought with batteries you didnt need to bypass them or anything. since its straight DC, you get no rippling. ive measuered my supply (still in the making), and its steady as it can be, even when using a high current drain.

 

[kiwi_abroad]

Yes you should apply caps near to the amplifier (or whatever). The reason is not to filter the low frequency ripple (as it's a battery), but to lower the impedance of the batteries and the connecting wires at the higher frequencies. For this reason, you won't need anywhere near 68000uF, I would maybe use something in the range 100-1000u, bypassed with a 10uF, 1uF and 0.1uF to make sure the impedance stays low at very high frequencies.

Cheers, Adrian

 

[JOE DIRT®]

I myself use a one farad capacitor bypassed with some (5) 0.1Uf 50V tantulum caps and on the binding posts I have a .01Uf 500v ceramic cap also included is a 8AG fuse holder that I change fuses according to what I am testing....it works excellent for me


DIRT®

 

[RichardJones]

Specific recommendations for bypass caps?

So,

I am going to use those 68,000uf caps... actually parallel 2 of them... 136,000uf total per channel.

What would everyone recommend for bypass caps???

Specific values and part numbers???

Digikey?

Thanks!!!!!!!