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Old 04-23-2012, 09:56 AM #1
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Lightbulb Experience with BUF634 as virtual ground circuit

Just curious if anyone has experience with using the burrs brown
BUF634 as a virtual ground driver for the Ophir heads?
I had heard these are very high quality opamps and that they are used in higher current situations. 250mA or so.
They seem to provide low noise characteristics and are sought after
in solid state ampliers.below is the data for the opamp

http://www.datasheetcatalog.org/data.../365074_DS.pdf


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Last edited by Seoul_lasers; 04-23-2012 at 10:04 AM.
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Old 04-25-2012, 01:18 PM #2
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Post Re: Experience with BUF634 as virtual ground circuit

Here is the rail splitter schematic.

In another schematic 2 more capacitors are place on either side of the output.

anyone have some ideas? I know I have seen Jib's circuit, but I have not seen anything posted recently about if there was a kit available for the Ophir heads?...
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Last edited by Seoul_lasers; 02-02-2013 at 02:38 AM.
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Old 04-25-2012, 01:34 PM #3
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Default Re: Experience with BUF634 as virtual ground circuit

I have Jib's circuit working. I posted it at PF earlier today. Hopefully nobody gets stressed out by me posting the link - I think it's justified since it's exactly what you're looking for in this case:
Ophir Dual Rail Supply - Drive Circuit (photos, Eagle files)
(Eagle files and render posted)
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Old 04-25-2012, 02:34 PM #4
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Default Re: Experience with BUF634 as virtual ground circuit

This was the missing piece to my LPM project.
Thanks for the offpage post! ::
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Old 04-25-2012, 03:50 PM #5
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Default Re: Experience with BUF634 as virtual ground circuit

Quote:
Originally Posted by Seoul_lasers View Post
This was the missing piece to my LPM project.
Thanks for the offpage post! ::
Happy to help!

(Though Jib is due the credit, not really me)
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Old 04-26-2012, 12:41 AM #6
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Default Re: Experience with BUF634 as virtual ground circuit

The dual DC-DC convertor idea sounds also promising as well. However, I'm thinking to keep the space down this PCB will work nicely!
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Old 04-26-2012, 01:01 AM #7
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Default Re: Experience with BUF634 as virtual ground circuit

I could shoot together a smaller version of the board that was basically just jib's circuit.

BRB
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Old 07-13-2013, 09:56 AM #8
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Default Re: Experience with BUF634 as virtual ground circuit

Greetings All!,
I stumbled upon this forum to my great relief & delight! I am in dire need of a BUF634 based virtual psu to drive 4 x 18640 Li-ion batteries. I have already tried the Ti data sheet version, but the - rail considerably higher than the + rail. Then I noticed here that some of you guys have successfully built & using forum member,"Jib's" version of this circuit.

I'd be extremely grateful if someone would kindly forward or direct me to "jib's" circuit so that I may know what i've done wrong with mine!

Thanks
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Old 07-13-2013, 03:05 PM #9
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Default Re: Experience with BUF634 as virtual ground circuit

This thread is over a year old....

I suggest you use the [Search] bars before making
your first post a NECROPOST....


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