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Old 19th February 2009, 12:53 PM   #1
adamus is offline adamus  United Kingdom
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Default recommend me a buffer (bi polar supply)

Hi,

Can anyone recommend me a simple buffer to run off a +/- 15v reulated supply. I have a spare supply, and need a buffer for a preamp i am building.

This will be built on perf board - so simple is good.

thinking Source > r2r vol control > buffer > valve amp (baby huey to be precise).

I have searched, but its pretty overwhelming, and i'll be honest and say my solid state electronics isnt great!

Thanks

Adamus.
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Old 19th February 2009, 01:05 PM   #2
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Ebay FET buffer

It's very good! I added after a passive pot before my UCD180HG power amp.

See this thread for more info...

STEREO FET BUFFER on ebay

I bought two and replaced all the resistors on one with 0.1% matched carbon films. Didn't change the sound much (possibly a shade smoother) but did reduce output offset voltage.
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Old 19th February 2009, 01:33 PM   #3
Thomo is offline Thomo  United Kingdom
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I built a buffer based on the Pedja Rogic buffer, which I found the info for on this forum.

Sounds incredible, far superior to just a "passive pre".

Cheers, Lee.
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Old 19th February 2009, 03:56 PM   #4
adamus is offline adamus  United Kingdom
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the fet buffer looks good and cheap. Any issue with offset on turn on, would i need a delay circuit or output caps (which i would prefer to avoid).

Thanks
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Old 19th February 2009, 06:13 PM   #5
juma is offline juma  Germany
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Quote:
Originally posted by Thomo
I built a buffer based on the Pedja Rogic buffer, which I found the info for on this forum.
Sounds incredible, far superior to just a "passive pre".
Cheers, Lee.
IMHO, it's superior to any other popular buffer circuit and Pedja is always glad to help. His site:
http://diy.audialonline.com/modulelab/
http://diy.audialonline.com/modulelab/buffer.php
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Old 19th February 2009, 10:25 PM   #6
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Superior in what way ??? Sound, specs, for 280 euro the parts and board better be goldplated.
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Old 20th February 2009, 12:56 AM   #7
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I'd either build Pedja's or the Pass B1.
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Old 20th February 2009, 06:31 AM   #8
dodo is offline dodo  Poland
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Default recommend me a bufer

search for the JISBOS ?
Well documented design in the net

If you want high quality design , look at Mr Borbely web-side
and his product called SUPER Buffer , he will charge you only 80-100EUR , which is more resonably price , compared to the
280 EUR
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Old 20th February 2009, 09:11 AM   #9
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80 Euros is more reasonable, in some east european countries the minimum wage is below 280 euros. Adamus wants simple so I suggest just 4 transistors and excellent performance, a buffer used by the old master JL Hood. Wire with current gain, what comes in is what comes out and can even drive headphones pretty well. For 0 V output offset adjust R1 R2 values, R3 should be around 100 ohms. Thd levels of -130db mostly 2nd, attainable by tweaking resistor values for particular load.

BTW the circuit shown by sharp is pretty good too. If you build them yourself they will maybe set you back 15 pounds or so for stereo.
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Old 20th February 2009, 09:29 AM   #10
mjf is offline mjf  Austria
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hello.
annother easy amp.
ic = ne5532(bip),opa2604(fet) or something else.....
you may test this circuit with a tl072.............
if you have a cap at the input of your poweramp you can c leave away (it is for safety,to block the offset from the ic).
47n.......100n nearby the pins of the opamp.
greetings.............
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