Re: guitar preamps
- From: gurzhfvp.jbexfubc@xxxxxxxxxxxx (Nick Odell)
- Date: Sun, 14 Oct 2007 18:34:06 GMT
On Sun, 14 Oct 2007 07:22:02 -0600, Anonymous <anon@xxxxxxxx> wrote:
Hmmm.... Looks like google groups (advanced group search) only works if you
strip the angle-brackets out of the MID. Odd.
Anyway, this is the part of my article that I was referring to....
=====================
About twenty or more years ago, I developed the following practical
circuit around standard theory. The FET has very low-noise
characteristics - better than most op-amps - and if you use low-noise
resistors it should be fine.
I've used this design in all my instruments since, though sometimes
with other stages tagged on the back.
The circuit is a "buffer" not a pre-amp. There is no gain but when a
piezo is matched properly it usually doesn't need any gain.
Current drain is miniscule: a 9v 500mAH battery will last up to two
years - maybe longer - even with no off switch!!
The components are tiny - you can solder them directly to a jack
socket.
COMPONENTS
Q1 2N3819
R1 10M
R2 10K
R3 68K
C1 2.2uF
View this in non-proportional text mode
+9v
|
|
/
D |/
|
in---R2-----|Q1 G
| |
| S |\
| \----C1----out
R1 |
| |
| R3
| |
gnd=======================
(you may consider R2 to be redundant but I reckon it sounds better
with it in!
HTH
Nick
=====================
Nick
Nick,
I'd like to look at this circuit (Message-ID:
<37cf8d3e.2916078@xxxxxxxxxxxxxx>), but I can't seem to find it on
Google groups. Can you provide a clickable link, or republish it here?
Thanks.
Nick Odell wrote:
On Thu, 11 Oct 2007 20:24:22 -0400, inkleput@xxxxxxx wrote:
gurzhfvp.jbexfubc@xxxxxxxxxxxx (Nick Odell) said:That's a high-gain overdrive circuit, if that's what you are looking for.
On Wed, 10 Oct 2007 17:30:26 -0400, inkleput@xxxxxxx wrote:http://cgi.ebay.com/Mini-Guitar-Boost-Circuit-BIG-Onboard-25-Db-Gain-F40_W0QQitemZ180164388363QQihZ008QQcategoryZ41416QQtcZphotoQQcmdZViewItem
If you have two high impedence input to low impedence output cards theDepends.
size of large postage stamps, one called a preamp the other called a
circuit booster, what's the practical difference?
I would assume that the circuit booster adds gain - maybe clean gain or
maybe a lot of distortion for electric guitar overdrive.
The pre-amp may add gain or it may just be an impedance converting buffer
with zero gain. Either way it could still be called a pre-amp. And the
difference between the two effects might be no more than one connection
on the board.
Are these things made from discrete components or are the circuits in a
chip? Is it practical for you to try the "suck it and see" approach to
discovery?
Nick
If you are looking for something to buffer an acoustic guitar and you want the
sound clean and and the unit simple and cheap, you could make one of these....
Message-ID: <37cf8d3e.2916078@xxxxxxxxxxxxxx>
.... for a couple of dollars.
Nick
--
real e-mail is nickodell at bigfoot dot com
.
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