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Old 28th June 2012, 11:16 AM   #11
mkv is offline mkv  South Africa
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Hey guys,

Thanks for the replies. To answer your questions, I am trying to run it from a single DC supply, namely a battery. From what I understand I could use 2 batteries in series, then take a tap off their join for the '0V'?

I guess I could use a 24V charger across the two 12V batteries if I wanted to charge without removing them?

Single source preamp/tone control circuits aren't THAT easy to find, however I have found a fairly easy one to make using the TDA1512A. That will solve all my needs, and I think I'll just use Class D amps for battery based applications.

Thanks!
Mark
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Old 28th June 2012, 10:40 PM   #12
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I think that cct is using 12v regulators.
If you are using 12V batteries, remove the regulators and fix a jumper across in to out.
those regs probably use more power than the rest of the board
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Old 29th June 2012, 05:21 AM   #13
MarianB is offline MarianB  Romania
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Quote:
Originally Posted by whizgeek View Post
...I think that cct is using 12v regulators...
I've already sayd it does on the other page, so it's nothing new

Quote:
Originally Posted by whizgeek View Post
..those regs probably use more power than the rest of the board...
Not likely, they have a quiescent current of les than 10mA ( about 6,5 to be exact ), the OA on the ather hand requiers more than that, ( about 20mA each ), but anyway, that is NOt the reason why he should bypass the regulators ( sayd that too myself ) but thing is the regs need some minimal Vin-Vout difference to work properly, you cannot power a 12v regulator with 12V and espect it to perform well, on the other hand, powering an OA from batteryes makes the regs useless cus the voltage is already fairly stable.

@mkv that board requires split supply so eyther 9 or 12V battery you still ned 2 of them, connect them in series and take the 0 point ( ground ) from the batteryes joyning point, connect them directly on the filter caps pins and bypass the regulators as i say before, that is all you need to do.
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Old 29th June 2012, 06:19 AM   #14
alayn91 is offline alayn91  France
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Hello,

It's written on the ad:
"- Input voltage:AC15V-0-AC15V"

So, you only need a transformer.

Regards.
Alain.
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Old 29th June 2012, 06:26 AM   #15
MarianB is offline MarianB  Romania
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@alayn91 didn't you read anything? @mkv specified that he wants to power the board directly from DC supply, he wants it to be mobile so a transformer is out of the question here.
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Old 29th June 2012, 06:36 AM   #16
mkv is offline mkv  South Africa
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Quote:
Originally Posted by alayn91 View Post
Hello,

It's written on the ad:
"- Input voltage:AC15V-0-AC15V"

So, you only need a transformer.

Regards.
Alain.
Hi Alayn91,

Thanks for the reply. But I'm looking to power from a DC source, like a battery. I'm going to do the twin 12V batt setup though, then charge across them with a 24v charger.

M
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Old 6th July 2012, 12:38 AM   #17
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You could try this: Switching boost Power Supply board DC12V to DC±32V 180W | eBay I bought one of these from this guy and it works just fine! The component quality is actually quite good and it operates pretty cool powering a load (when properly heatsunk).

Because the preamp board you're looking for has a bridge rectifier on the input, you can apply AC (naturally) or DC and it will work fine. With +/-DC voltage applied, the current will just flow through two diodes only, but still work fine.

Next, because the preamp board you're looking at uses input regulators, most likely 7812/7912 (or 9V, 15V), and they can handle up to 37Vin, so applying the +/- switching regulator with an output of +/-32VDC, it will work just fine.

Plus, there should be enough power left over to run a power amp along with the preamp all from the same supply.

You'll have to check on shipping to your location, but this is a reputable seller and a great price for the complexity and quality of the supply.
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Old 6th July 2012, 11:46 AM   #18
spwalek is offline spwalek  United States
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Do you need the 24v swing? If not I would suggest bypassing the regulators and building a negative voltage pump with a 555 timer. If it's just opamps you shouldn't need a ton of current and it will keep the weight down if it's portable. just a thought
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