How to regulate battery power

[noviygera]

Hello guys,
I need to get +/- 17v dc from batteries for experimentation purposes to power my ss preamp. Not too tech savvy.
How do make this regulator to get +/-17v from two banks of batteries that have about 18 to 20v per bank (I will use total of 6 x 6v lead acid batteries).
thanks!

 

[trobbins]

Use two separate supplies - both the same - pos of one connected to neg of other.

Option one: 24V battery with 7815 regulator plus a few diodes in the gnd leg to bring up to 17V output.

If you don't have that many batteries, then buy two stepup dc/dc that can work from 6 or 12V, and boost to 17V.

 

[Chris Daly]

arrange 3 x 6v like this positive voltage +- +- +- earth
and 3 x 6v negative voltage -+ -+ -+ earth

to get very close to 17v without any complication, use a forward biased diode for each
supply, rated at required current or 2x diode to drop typically
.6v for one or 1.2v for two observing anode from battery cathode to load for the positive supply
and cathode from battery and anode to load for the negative supply.

You should end up depending on how close batteries are charged to 6v with
your required 17v positive and negative

Cheers / Chris

.

 

[noviygera]

"use a forward biased diode for each supply"

will this keep dropping the voltage as the batteries drain?

 

[rayma]

How do make this regulator to get +/-17v from two banks of batteries that have about 18 to 20v per bank
(I will use total of 6 x 6v lead acid batteries).

I think +/-15V from the regulator outputs is more realistic for these batteries, since the most you'll get
from them is around 19V when fully charged.