Need a dc converter

I need some help finding an off the shelf fairly compact dc converter boards that provides two adjustable outputs, one positive and one negative in order to drive power op amps. The input supply will be 12 to 15 volts DC filtered but unregulated (current not an issue), and the outputs I need are plus and minus 5 volts at about 1200ma continuous. For logistical reasons, I'd rather not build them as they are needed to modify some older industrial equipment, some of which is across the country, and there is quite a few of them.

 

It's been some time but I did see those in the Newark catalog, however right now I do not even know if they're still in business. If not, seems to me that WW Grainger should have what you need. Perhaps even Digikey. If you use Google to find Digikey, make sure you go to the one that is one word, not Digi-Key. I have no idea who those people are, the one you want is one word Digikey. Their website is actually pretty good, at least you can get the price before going to checkout like some places.

 

[Rich Webb]

On Sun, 5 May 2013 08:35:45 -0700 (PDT), str00ntz@aol.com wrote:

I need some help finding an off the shelf fairly compact dc converter boards that provides two adjustable outputs, one positive and one negative in order to drive power op amps. The input supply will be 12 to 15 volts DC filtered but unregulated (current not an issue), and the outputs I need are plus and minus 5 volts at about 1200ma continuous. For logistical reasons, I'd rather not build them as they are needed to modify some older industrial equipment, some of which is across the country, and there is quite a few of them.

Adjustable or +/- 5V?

Look at XPPower's JTK1548D05 for a 9-36 V in, +/-5 V out @ +/- 1.5 A.
Have used XPPower modules in the past, though not this particular
model.

 

Those things are like fifty bucks.

 

[Rich Webb]

On Sun, 5 May 2013 15:23:28 -0700 (PDT), jurb6006@gmail.com wrote:

Those things are like fifty bucks.

Yes, that's correct.

The OP's requirements are rather incomplete but an encapsulated supply
like this seems to be a reasonable swag for "industrial equipment."
This presumably means that Very Bad Things Can Happen if it fails.

A low cost answer would be something along the lines of a 555-driven
voltage inverter, a few filter caps, and 7805 & 7905 regulators, all
wired point-to-point on veroboard.

Absent any specific requirements, I suppose either would do.

 

[George Herold]

On May 5, 11:35 am, str00...@aol.com wrote:

I need some help finding an off the shelf fairly compact dc converter boards that provides two adjustable outputs, one positive and one negative in order to drive power op amps.  The input supply will be 12 to 15 volts DC filtered but unregulated (current not an issue), and the outputs I need are plus and minus 5 volts at about 1200ma continuous.  For logistical reasons, I'd rather not build them as they are needed to modify some older industrial equipment, some of which is across the country, and there is quite a few of them.

Do you need the +/- supplies to be regulated? Or can you make a "rail
splitter" to give yourself a ground that floats between the power
rails? (another power opamp could be the rail splitter.)

(You could do a rail splitter and then +/-5 volt regulators... but at
12V you start to run out of head room.)

George H.

 

[Martin Crossley]

Rich Webb wrote:

On Sun, 5 May 2013 15:23:28 -0700 (PDT), jurb6006@gmail.com wrote:

Those things are like fifty bucks.

How about a Murata BEI15-050-Q12P-C for 18.52GBP at RS components or 32USD
at Digi-Key?
How much cheaper do you need, or lower quality can you accept?