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Old 26th November 2006, 05:03 AM   #1
broka is offline broka  Chile
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Default Make A Good Pre-amplifier???

hello friends, somebody can help me, with a good diagram of a, pre-amplifier that I want to make one good that has control of volume, first floor and sharp, but that it is active pre-amplifier, greetings friends....
if you have a PCB proto board, design protel ..that is a good idea..thanks s friends
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Old 26th November 2006, 02:43 PM   #2
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Have a look at this one.
http://sound.westhost.com/project97.htm
PCboards are already available.
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Old 26th November 2006, 03:08 PM   #3
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Default Though I have not made, for only references

Hi Nice to meet you, I think that I can help it.
Though I have not made, for only references

CASE 1 CR tye equalizer type
http://www.minor-audio.com/bibou/NO-...NO-NFB_EQ.html
is interesting , it's no NFB pre and CR tye equalizer, But not English.
So only see the curcuit for refer

CASE2 Only FLAT amp (LINE amp) type
http://kobe.cool.ne.jp/sinotec/opamp/opamp.html
it's simple to use OP amp.This is not in English,but ther is PCB like fig.
(there is unique means using input VOL ,but II do not check it.

I think that for pre ,it is important the constant VOL regurater.
It is only reference, attach a circuit

sincerely
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Old 26th November 2006, 03:25 PM   #4
lineup is offline lineup  Sweden
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Quote:
Originally posted by XEAGLEKEEPER
Have a look at this one.
http://sound.westhost.com/project97.htm
PCB boards are already available.
Quote:
by Rod Elliott:

Construction

Note that although shown using TL072 opamps,
OPA2134 or anything else that suits your purposes may be used instead.
I would definitely upgrade to OPA2134.
TL072 will work, but no question OPA2134 is at another level in performance.

If using OPA2134, ESP project97 is a very good preamplifier. No doubt.
Especially if using the PCB created by a qualified audio designer, Rod Elliott from Australia.

Project97 uses BASS and TREBLE tone controls,
but also features a DEFEAT switch, if you do not want those to effect the output.
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Old 26th November 2006, 03:41 PM   #5
lineup is offline lineup  Sweden
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Default ESP Project88 - High Quality Audio Preamp - OPA2134

.
If you, like many other audio purists, do not need tone controls,
you can go for this one instead.
It is a very popular and good HiFi preamplifier.
If you search forum here, you will see many members have built versions of this
and they are very happy with it.

It has only got basic volume and balance control.
The default version uses OPA2134 as op-amp.

Click the image to open in full size.

ESP Project88 - High Quality Audio Preamp (Mk II)

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Old 26th November 2006, 04:00 PM   #6
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Lineup
Good tips .. One of my next projects is going to be a fully complimented preamp with at least 3 preouts.
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