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Old 23rd March 2009, 09:50 AM   #1
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Default Preamp with headphones

Sorry I don't know anything (I'm a complete novice at all of this) but if I want to be able to hear my guitar...through my headphones. If I make a preamp such as the JFET one described here: http://www.till.com/articles/GuitarPreamp/index.html
would I be able to do that? apologies again.
thanks.
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Old 23rd March 2009, 03:26 PM   #2
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Default Re: Preamp with headphones

Quote:
Originally posted by jai.leeworthy
would I be able to do that?
Whom do you expect to know that other than yourself?
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Old 23rd March 2009, 04:37 PM   #3
infinia is offline infinia  United States
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Hi
No, gain is at best very low (w/o any load) and will be too loaded down by typ. hi-fi headphones < 64 ohms.
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Old 24th March 2009, 12:06 AM   #4
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is there any way i could make any adjustments to it?
sorry again, i have no idea. just hoping for some input
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Old 24th March 2009, 06:13 AM   #5
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Default sorry

on looking it up, the particular device i want to build is called a headphone amp. i just want to know if anybody has any idea how to build one.
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Old 24th March 2009, 06:34 AM   #6
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http://www.headwize.com/projects/cmoy2_prj.htm
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Old 24th March 2009, 05:43 PM   #7
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I don't think even a headphone amp will do what you want. Guitar amps require a gain of around 20.

http://www.generalguitargadgets.com/...eamp/lm386.gif
This is what you are looking for.

Lots of good info on that site for what you want to do.
http://www.generalguitargadgets.com/...amp/index.html
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Old 26th March 2009, 09:09 AM   #8
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Quote:
Originally posted by pacificblue
http://www.headwize.com/projects/cmoy2_prj.htm

thanks, i had found this one. the beginner electronic persons one is here:-
[urlhttp://tangentsoft.net/audio/cmoy-tutorial/[/url]
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Old 27th March 2009, 12:20 AM   #9
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Quote:
Originally posted by jai.leeworthy



thanks, i had found this one. the beginner electronic persons one is here:-
[urlhttp://tangentsoft.net/audio/cmoy-tutorial/[/url]

Ok maybe I wasn't clear. A low gain, low power, stereo amp is not what you want.

A guitar is passive like a mic. It needs an amp with a gain of around 20 and a bit of power behind it. Guitars are also MONO!

The links I have posted above is a simple amp made for a guitar that has a standard gain of 20 with a switch for a gain of 200(distortion). The guitar should have it's own volume control so you don't need anything complicated. The amp posted above has enough power to drive a small PC style speaker like one of those belt clip amps you can buy. It will also run headphones just fine. It will run off batteries or you can use a DC supply of around 9-12v.

Forget the Cmoy. It's a great headphone amp but it was not designed for a guitar or any other passive device for that matter.
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Old 30th March 2009, 08:52 AM   #10
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Quote:
Originally posted by Rembrant

Ok maybe I wasn't clear. A low gain, low power, stereo amp is not what you want.

A guitar is passive like a mic. It needs an amp with a gain of around 20 and a bit of power behind it. Guitars are also MONO!

I didn't see this post, sorry. If I change the gain of the cmoy, can I still use it? (even if guitars are only mono. I figure [correct me if I'm wrong] that if I make my own cable, i can distribute the one guitar channel onto both the channels on the cmoy) uh, sorry, can you elaborate on the term passive? how do I power it? does the circuit have to be running through it to power it? what can it amplify?

its just that i'm reluctant to not use the cmoy. its really well documented, i can obtain the parts (which is hard in australia) and it seems simple enough to make. what do you think?
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