Preamp

bjackson · 2nd May 2005, 05:52 PM

Hey, I've tried to make sense of the GC Preamp thread but, no such luck :-). I am in need of a preamp having atleast 2 RCA inputs but hopefully more and a quarter inch output and RCA output.

I am hoping to find a PCB and/or kit to do this. I am also doing this as a (hopefully) simplier project before I attempt to build a couple gainclones to practice some soldering.

Thanks!

Russ White · 2nd May 2005, 05:57 PM

Building a gainclone is actually probably easier.

bjackson · 2nd May 2005, 06:17 PM

<quote> Building a gainclone is actually probably easier. </quote>

But I still need a preamp either way and don't have the money for an off the shelf solution which leaves me with DIY or bust :-)

Russ White · 2nd May 2005, 08:29 PM

Well, I can tell you what I did for my first DIY preamp.

I built a small box and put two CMOY type circuits in it both fed from the same 10K stero pot from single pair of RCA input jacks on the rear.

The output of one of the CMOY circuits went to two RCA jacks in the rear, the output of the other went to a 1/8" stereo jack on the front.

This is one of my favorite preamps, simple and it sounds great!! You can really tweak it just by alternating opamps. On one such preamp I ended up using a pair of OPA637s for the power amp output and a pair of AD8610s for the headphones.

Here is a link to the CMOY headphone amp which BTW makes a very good preamp, especially as a beginner project.

CMOY

I can post pictures of a few of my preamps and headphone amps if you would like to see how I did it.

I built mine on simple protoboards (different types) without the use of any PCBs. The circuits are really not that complex, even if you throw in a buffer like the buf634.

Good luck!

Nuuk · 2nd May 2005, 08:48 PM

A possible solution?

2nd May 2005, 05:52 PM	#1
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	Preamp Hey, I've tried to make sense of the GC Preamp thread but, no such luck :-). I am in need of a preamp having atleast 2 RCA inputs but hopefully more and a quarter inch output and RCA output. I am hoping to find a PCB and/or kit to do this. I am also doing this as a (hopefully) simplier project before I attempt to build a couple gainclones to practice some soldering. Thanks!

2nd May 2005, 08:48 PM	#5
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	A possible solution? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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2nd May 2005, 05:57 PM	#2
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	Building a gainclone is actually probably easier.

2nd May 2005, 06:17 PM	#3
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	<quote> Building a gainclone is actually probably easier. </quote> But I still need a preamp either way and don't have the money for an off the shelf solution which leaves me with DIY or bust :-)

2nd May 2005, 08:29 PM	#4
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	Well, I can tell you what I did for my first DIY preamp. I built a small box and put two CMOY type circuits in it both fed from the same 10K stero pot from single pair of RCA input jacks on the rear. The output of one of the CMOY circuits went to two RCA jacks in the rear, the output of the other went to a 1/8" stereo jack on the front. This is one of my favorite preamps, simple and it sounds great!! You can really tweak it just by alternating opamps. On one such preamp I ended up using a pair of OPA637s for the power amp output and a pair of AD8610s for the headphones. Here is a link to the CMOY headphone amp which BTW makes a very good preamp, especially as a beginner project. CMOY I can post pictures of a few of my preamps and headphone amps if you would like to see how I did it. I built mine on simple protoboards (different types) without the use of any PCBs. The circuits are really not that complex, even if you throw in a buffer like the buf634. Good luck!

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