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Old 27th February 2003, 10:44 PM   #1
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Default Rod Eliot project 88 question

Have anybody built project 88 from Rod`s page? I am interested in sound quality.


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Old 27th February 2003, 11:01 PM   #2
halojoy is offline halojoy  Sweden
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Default Re: Rod Eliot project 88 question

Quote:
Originally posted by supernet
Have anybody built project 88 from Rod`s page? I am interested in sound quality.
Supernet
How about some information about what
ESP Project 88 is?

High Quality Audio Preamp (Mk II) - Rod Elliott (ESP)

Quote:
Introduction
The original preamp (Project 02) shown on these project pages is basically a good design, but in the interests of improved quality and reduced "frills" this new version will fill or exceed most expectations. The quality comes largely from the use of one of the nicest sounding opamps available, the Texas Instruments/ Burr Brown OPA2134.

Although a conventional voltage feedback device, this opamp has few peers for sound quality, and I decided that it was time to make a PCB available.
------------------------------
It is a control preamp based on Burr-Brown OPA2134 dual OP.

Uses one OP for input and a second OP for output.
In between are Balance and Volume control.
It uses input and output caps.
You can select the gain of OPamp to suit your needs.
There are tables for how to Set the Gains of the OPamps.
Suggested Power Supply is 2x15VDC.
--------------------------------------------
Preliminary measurments, on the workbench:

Frequency Response 10 Hz to 250 kHz -0.4 dB
Noise < 0.5 mV RMS at full gain (input open)
Crosstalk Better than -58 dB at 100 kHz
--------------------------------------------
Click the image to open in full size.
Picture shows the Project 88; OPA2134 hifi pre amp
on the available PCB.


/halo
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Old 27th February 2003, 11:43 PM   #3
trwh is offline trwh  United Kingdom
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Check here:

Pics of my preamp
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Old 27th February 2003, 11:47 PM   #4
halojoy is offline halojoy  Sweden
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Thumbs up Yes, Perfect trwh !!!

Quote:
Originally posted by trwh
Check here:
Pics of my preamp
yes. check this out!

Pics of my preamp - trwh

Maybe we can go over there to get some comments from
trwh

/halo
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Old 28th February 2003, 11:18 PM   #5
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Wov, nice project. Could you post the schematic of Alps control circuit?

Do you satisfied with it`s sound quality?


Supernet
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Old 1st March 2003, 09:45 AM   #6
trwh is offline trwh  United Kingdom
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Quote:
Originally posted by supernet
Wov, nice project. Could you post the schematic of Alps control circuit?

Do you satisfied with it`s sound quality?
Hi supernet

I'm reluctant to post the schematic of the remote volume control circuit, since as I say in my other thread, I pinched it from a service manual!

The sound quality is excellent, I could easily compare the P3A/P88 combo to commercial gear in the $1k+ range.

See ya,
Tim.
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Old 1st March 2003, 11:30 AM   #7
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OK, tell me how much did you paid for boards from Rod?

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Old 1st March 2003, 01:11 PM   #8
paulb is offline paulb  Canada
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Rod posts prices at his site. www.sound.au.com
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Old 1st March 2003, 07:34 PM   #9
Nisbeth is offline Nisbeth  Denmark
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Quote:
Originally posted by trwh


I'm reluctant to post the schematic of the remote volume control circuit, since as I say in my other thread, I pinched it from a service manual!

See ya,
Tim.
That's allright Tim, you can mail it to me - I won't tell (seriously, if you think you can post it, I'm very interested as well)

/U.
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Old 1st March 2003, 08:11 PM   #10
mik is offline mik
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I'am also interested,can you mail me too?

Thanks in advance
Audiofanatic@swissinfo.org
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