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Digest of fuzz box building and other fuzzy articles
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From: dam@dcs.glasgow.ac.uk (David Morning)
Newsgroups: alt.guitar
Subject: Fuzz Box From Hell (corrected version)
Date: 30 Sep 92 09:24:37 GMT
Organization: Glasgow University Computing Science Dept.
I knew I shouldn't have posted something which had been collecting dust
for years in my files. Oh well. My original version used 2 batteries to
provide a split rail supply. In my rush to post it, I bodged the battery
supply splitter. I wasn't convinced I'd got it right after I'd posted it
so a built it from scratch at the week-end. There are 2 connection errors
in the original, both the input resistor and the 680 ohm feedback resistor
should go to the V/2 rail and NOT the battery -ve.
Sorry folks. This one does the trick. Oh..and it's a 9 volt battery (small type)
Battery is 9 volts.
Op-amp is anything. 741 is noisy, TLO71/72 is less noisy, NE5534 is least
noisy but drains the battery.
--- Op-Amp
| \
| \
Inputo----||----------| + \
0.47u | | \ 0.47uF
| | >-----------------||------
| | / | | |
| ---| - / | ---\ -
- | | / - / \ ZD1 | |
| | | | / | | - | |100k
68k | | | | / 330k| | | -
- | --- - - |-------o Output
| | | \ / ZD2 |
| | | ---/ -
| | | | | |
| -------------------|------- | |2k2**
| | -
| - |
| | | |
| 680ohm | | |
| - |
| | |
------------------------------> V/2* |
|
Input | Output
Gnd o----------------------------------------------------------------o Gnd
Battery rail splitter
=====================
Batt +ve-----------------------------------------> To Op-Amp +Vs
|
|
-
| |220k
| |
-
|
-------|------------> To V/2*
| |
--- ++ -
100uF --- | | 200k
| | |
| -
| |
| |
Batt -ve -----o\o-------------------------------> To op-amp -Vs
Jack socket switch |
|
------> To Gnd
Jack socket switch wiring:-
=========================
-------------------
| Sleeve Ring Tip |
Jack plug ---> | - - - |
goes in here | | | | | | | |
| | | | | | | |
--| |---| |---| |--
From battery -----| | | | | |
-ve terminal - - -
|
-------------> To battery rail splitter
Inserting mono plug shorts sleeve and ring together and activates the
battery.
---------------------------------------------------------------------------
This it?
+9v---|1meg|----|1meg|----> Gnd
| |
|----||---
- + 1uf
1meg | |
| |
-
|
10nf | | \ 741
In ----||---|10k|----|+ \ + 1uF
| | >-------||----|10k|-----
- -|- / | |
- 1nf | | / - |
| | | | 1meg |
| | - -
| -----------| | |
| | 10k| |<----- Out
| - 47nF | |
| - -
| | |
| - |
| | |4k7 |
| - |
| ----------| |
| | | |
| -------- - 500k |
| | | | |<- |
| 1N270 - 1N270--- | | | |
| \ / / \ - | |
| --- - |--- |
| | | | |
------------------------------------------------------------------Gnd
Dave
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Newsgroups: alt.guitar
From: META000 <META@UNB.CA>
Subject: Re: MXR Distortion +
Organization: The University of New Brunswick
Date: Tue, 6 Oct 1992 22:30:15 GMT
In article <Bvnp44.J05@dcs.glasgow.ac.uk> dam@dcs.glasgow.ac.uk (David Morning) writes:
>
>This it?
>
> +9v---|1meg|----|1meg|----> Gnd
> | |
> |----||---
> - + 1uf
> 1meg | |
> | |
> -
> |
> 10nf | | \ 741
>In ----||---|10k|----|+ \ + 1uF
> | | >-------||----|10k|-----
> - -|- / | |
> - 1nf | | / - |
> | | | | 1meg |
> | | - -
> | -----------| | |
> | | 10k| |<----- Out
> | - 47nF | |
> | - -
> | | |
> | - |
> | | |4k7 |
> | - |
> | ----------| |
> | | | |
> | -------- - 500k |
> | | | | |<- |
> | 1N270 - 1N270--- | | | |
> | \ / / \ - | |
> | --- - |--- |
> | | | | |
> ------------------------------------------------------------------Gnd
>
>Dave
>
>--
>.
>.
Just about.
The diodes are connected between the input to the "OUTPUT" volume
control, not the input to the "DRIVE/DISTORTION" control, and
ground. In response to queries sent to me, let me note that the +
terminal of the battery (i.e., +9vdc) is connected to pin 7 on the
op-amp, and the - terminal of the battery goes to pin 4 and ground.
Not all readers are aware of these implicit details. My apology for
ommitting them.
Mark Hammer
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Newsgroups: alt.guitar
From: dnj@kauai.verity.com (Dave Johansen)
Subject: Re: Tube sound fuzz
Organization: Verity, Inc. 1550 Plymouth Ave, Mt. View, CA 94043
Date: Mon, 25 Jan 93 19:09:49 GMT
A word of note: Hendrix' Purple Haze was done with
a Fuzz Face, and a Roger Mayer Octavia (on the solo,
and outro solo) thru of course a Marshall 100w Super
Lead....
PS you can buy all the Roger Mayer products from
North Star Audio, in Charlotte NC....
-dnj
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Newsgroups: alt.guitar
From: s0477311@let.rug.nl (M. Verhoef)
Subject: RAT schematics
Date: Wed, 6 Apr 1994 08:55:52 GMT
Organization: Faculteit der Letteren, Rijksuniversiteit Groningen, NL
Hi All,
it took a long time but here it is.........
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