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DIY Split Rail +/- Circuit for Ophir heads

ARG

ARG

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Hey everyone,

This is just a peak preview of what is to come.

I've made a small circuit that will generate the split rails for the Ophir head, and regulate the rails. All that needs to be done is hook up a 9V battery.

lhGMwVG.jpg

It looks large on the breadboard, but the actually circuit should fit within 15mmx20mm :)

It's all through hole so it will be easy to DIY as well! This is an easy way to make a DIY Ophir LPM without using two 9V's.

These will be available soon in the B/S/T for 5$. The schematic/board will also be released publicly as part of the ARGMeter project.
 
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Blord

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

That is nice. Any idea how long it last on one 9V block ? These cell doesn't hold much capacity.
 
ARG

ARG

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Powering an Ophir 20C head it should last over 48 hours on a single 9V cell.
It is also possible to use a 12V li-ion pack with a 9V voltage regulator for longer run times :)
 
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awillis2589

awillis2589

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

You bet me to it I was going to say you could use an lm7809 to drop voltage and run 3x18650's
 
Cyparagon

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

ARGLaser said:
It is also possible to use a 12V li-ion pack with a 9V voltage regulator for longer run times :)
Click to expand...

But... you already have a regulator. Are you saying it works at 10V, but 12V will kill it?
 
ARG

ARG

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Cyparagon said:
But... you already have a regulator. Are you saying it works at 10V, but 12V will kill it?
Click to expand...

Yeah, it splits the rails then regulates. The IC only goes up to 10V. 12V will probably kill it.I'm getting a better IC before the release.
 
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Cyparagon

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Strange. What about 7.4V? A 9V isn't "dead" until 5V or so, so if the regulator doesn't work down to 5V, you're only using a tiny fraction of the capacity you calculated earlier.
 
phenol

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Lmc7660?...
 
Pman

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Sounds great ARG!
 
Bionic-Badger

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

So wait, what voltages does this take as input, and what are the outputs?
 
awillis2589

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

it takes a 9V battery and makes it so the Ophir runs off a single battery. so it splits the rails. ARG will be able to explain more when he gets back from his vaction.
 
Bionic-Badger

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

I know it's a rail splitter, but I want to know what output voltages it's providing. It's not going to be the full +/- 4.5V if it's dropping voltage for regulation. If it's just splitting the rails you could use just a single TLE2426, possibly with some capacitors, or something like that.
 
awillis2589

awillis2589

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

well i'm sorry but i'm not completly sure of all parts and specs but from what i understand it gives 9V on the positve and negative or other wise it would make for reading up to 5W. i also believe he is working on increasing it so that the Ophir will be able to read up to 20W because Mrcrouse is now making heatsinks for the Ophir's.
 
lasersbee

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Just saw this... seems like this Thread was posted just hours after
we posted our Paid For Sticky Ad that same morning then replaced....

Look familiar...:whistle:

Split Rail Regulated +/- Power Supply for OPHIR 20C
Thermopile Heads

You could have at least worded the Title a bit more uniquely...

Good luck with your design...:beer:


Jerry
 
ARG

ARG

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Re: Split Rail Regulated +/- Power Supply for Ophir heads

Sorry about that Jerry, honest mistake.

I guess when I made the title what I had read earlier in the day was still in my mind. I'll change the title in a bit.

Edit: @BB Recently had a few re-design thoughts, output voltages will probably be +/-8V, going to be changing up a few IC's so I don't know what the final input will look like yet.
 
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ARG

ARG

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@BB Design has been finalised +/-6V out. Input is 4-30V (or close to that need to test it before input is finalised)

I sent these off to be fabricated. Expect to see them soon :)

Part cost was a little more than expected. The all in one IC I wanted to use didn't have a decent cheap alternative.
 
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