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January 26, 2015, 01:03:55 PM

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DIYstompboxes.com
|  DIY
Stompboxes  |  Building
your own stompbox  |  better
compressor pedal??

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Topic: better compressor pedal??  (Read 29699 times)

Fuzz
Aldryn

Posts: 197

Re:
better compressor pedal??

« Reply #100 on:
April 16, 2012, 09:05:36 AM »

Hi,

there's definitely a
need for a schematic: In case I wanna use a
electrolytic cap for c4 and c5 which orientation
should they have? Without a schem its nearly
impossible to say that without too much effort!

Thx!

Helge

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merlinb

Posts: 1226

Merlin, Lancashire
UK

Re:
better compressor pedal??

« Reply #101 on:
April 16, 2012, 09:58:57 AM »

Quote
from: Fuzz Aldryn on April 16, 2012, 09:05:36
AM

In case I wanna use a
electrolytic cap for c4 and c5 which orientation
should they have? Without a schem its nearly
impossible to say that without too much effort!

It's not impossible- in fact
its very easy! You can see that those capacitors
connect to ground (just follow the back lines...)
so that end of the caps must be
negative.

Logged

merlinb

Posts: 1226

Merlin, Lancashire
UK

Re:
better compressor pedal??

« Reply #102 on:
April 17, 2012, 08:00:19 AM »

Here is a quick sound clip. The
first half is clean signal that I recorded in. The
second half is the same track played back through
the compressor.
http://dl.dropbox.com/u/57831278/engineersthumb.mp3

A
lot of the hiss you hear is from the original
recording, being amplified by the compressor,
rather than coming from the compressor itself.
Some of the transients did also clip my sound
card, but it's not too bad.
Here's a picture of
the original and compressed tracks:

Logged

liquids

Posts: 1021

Matthew

Re:
better compressor pedal??

« Reply #103 on:
April 17, 2012, 08:36:17 AM »

Merlin - obviously this is a
good compressor!

However, it's also nice to
hear DIYers who have a bit of chops to play
some music with the guitar and
effects/circuit chops, too.     Nicely done.

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Breadboard
it!

mr_deadmaxxx

Posts: 150

Don -
Phil.

Re:
better compressor pedal??

« Reply #104 on:
April 17, 2012, 08:42:35 AM »

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Le
québécois

Posts: 123

Charles D.

Re:
better compressor pedal??

« Reply #105 on:
April 17, 2012, 10:35:26 AM »

Wow, very nice sound. Now I want
to build it!
I've realized that I have all the
part rigth here except the 13700. Will it work
with 13600?

congratulation

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merlinb

Posts: 1226

Merlin, Lancashire
UK

Re:
better compressor pedal??

« Reply #106 on:
April 17, 2012, 02:10:54 PM »

Quote
from: Le québécois on April 17, 2012, 10:35:26
AM

Will it work with
13600

I haven't tried, but AFAIK it
should work- they're the same OTA inside, only the
darlington pair is different, but that's not used
in my circuit. You could always build it with
13600 and then buy a 13700 later on.

Logged

merlinb

Posts: 1226

Merlin, Lancashire
UK

The
Engineer's Thumb

« Reply #107 on:
April 21, 2012, 08:26:31 AM »

New thread started!
http://www.diystompboxes.com/smfforum/index.php?topic=97123.0

Logged

GFR

Posts: 383

Re:
better compressor pedal??

« Reply #108 on:
April 21, 2012, 03:43:40 PM »

I designed this with a friend of
mine round 1990:

ps. there's an error in the
drawing, U9A + and - pins are
swapped

Precision FWR from input,
controlling a variable resistor in the feedback
loop of an opamp (got the idea from an eti
magazine project).
But, unlike the ETI project,
we didn't use an OTA.

Q2 and comparator
U3A are a sawtooth oscillator (around 400kHz
IIRC). This sawtooth is compared to the FWR output
and so we have a PWM signal proportional to the
input envelope. We use this to control some cmos
switches that vary the amount of signal that is
fed back around the opamp.

With a good,
clean power supply, there's no strange noises. I
think with a good layout (we only tested on
protoboard) it can be less pricky about the power
supply.

If you have a large transient,
during the attack time the output of a limiter is
larger than the set threshold, so even in the
feedback loop an OTA input can be overdriven
during a short time. Also if the ratio is not
infinite you can overdrive the OTA. We designed
this switched limiter to try to eliminate this
distortion.

The circuit can be simplified,
for example the FWR is overkill - it is way too
fast.

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roseblood11

Posts: 483

Re:
better compressor pedal??

« Reply #109 on:
May 01, 2012, 01:41:54 PM »

Two other interesting
compressors are mictester's "Really Cheap
Compressor" and "Compression Sustainer", both
posted at the other forum.
This one looks very
interesting as well: http://www.hexeguitar.com/diy-tadek_e
I
think Fuzz Aldryn has built it, maybe he can
report.

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Photography
Layouts & Pedal
Porn

liquids

Posts: 1021

Matthew

Re:
better compressor pedal??

« Reply #110 on:
May 02, 2012, 07:13:20 AM »

Quote
from: roseblood11 on May 01, 2012, 01:41:54
PM

Two other interesting
compressors are mictester's "Really Cheap
Compressor" and "Compression Sustainer", both
posted at the other forum.
This one looks very
interesting as well: http://www.hexeguitar.com/diy-tadek_e
I
think Fuzz Aldryn has built it, maybe he can
report.

Yeah, I do like the look of
that design.  In fact I like most of what
I've seen from Hexe, schematics and pedals
alike.

I mean, that chip is more or
less a 8-pin single VCA that can function as a
power amp, or a 1W power amp that can be used as a
VCA or simple voltage controlled volume....pretty
useful, though maybe I'm easily amused

Would love to compare
noise under high squash settings.  Right now
I'm using a THAT 2159/2180 type in a circuit, but
I kinda wish I ordered one of those chips with my
last order....gotta put it on the parts list for
next time.

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merlinb

Posts: 1226

Merlin, Lancashire
UK

Re:
better compressor pedal??

« Reply #111 on:
May 02, 2012, 07:20:14 AM »

Quote
from: liquids on May 02, 2012, 07:13:20
AM

Would love to compare noise
under high squash settings.  Right now I'm
using a THAT 2159/2180 type in a circuit, but I
kinda wish I ordered one of those chips with my
last order....gotta put it on the parts list for
next time.

The TDA7052A is a noisy
device, just check the data sheet! At max gain it
reaches an alarming 650uV output noise... no
better than an OTA, ala dynacomp.

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liquids

Posts: 1021

Matthew

Re:
better compressor pedal??

« Reply #112 on:
May 02, 2012, 09:01:35 AM »

Thanks for the heads up!
Obviously, I had not read the datasheet too
thoroughly...

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Breadboard
it!

JohnForeman

Posts:
113

Re:
better compressor pedal??

« Reply #113 on:
May 03, 2012, 05:09:32 AM »

Quote
from: roseblood11 on May 01, 2012, 01:41:54
PM

Two other interesting
compressors are mictester's "Really Cheap
Compressor" and "Compression Sustainer", both
posted at the other forum.
This one looks very
interesting as well: http://www.hexeguitar.com/diy-tadek_e
I
think Fuzz Aldryn has built it, maybe he can
report.

I'm new here so I'll ask,
what is the "other forum"

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pedalgrinder

Posts:
91

Re:
better compressor pedal??

« Reply #114 on:
May 06, 2012, 06:22:42 AM »

the other forum is
freeestompboxes oops take out one e you can judge
the politics for yourself. On the other forum
there is the  Rothwell Love Squeeze
sensational unit. Sabrotone has a vero of it on
his site if you want to have a look. One of the
best and easiest compressors to get going you only
have to read the reviews on it that say it all.
Thats what i reckon anyhow.

« Last
Edit: May 06, 2012, 06:24:44 AM by
pedalgrinder »

Logged

Xavier

Posts: 525

Xavier
M.

Re:
better compressor pedal??

« Reply #115 on:
May 08, 2012, 02:21:43 AM »

I've had / built quite a few
compressors and have been a faithful CS3 user for
20 years..............and then I built the Diamond
compressor as per Sabro's layout.

Compared
to a "standard" Dynacomp:

- It's way less
noisier
- It has WAY more output
- The
compression range is (imho) far more usable, with
less artifacts. It can be really subtle or squishy
as hell
- It is WAY cleaner . very low
background noise
- The switchable eq knob goes
from pretty warm to quite bright

I guess i
can say that (to me) is waaaay ahead of any other
compressor I have tried (dynacomp, keeley,
squeezer and the Rothwell, which I found rather
disappointing and lacking any character).  I
think it does both the
"so-transparent-you-don't-know-it's-on" thing as
good as the chicken' pickin'............I highly
recommend trying it

FWIW, here's a song I
made using a clon of a Demeter Compulator, which
is also an optocoupler based compressor, but it's
way too subtle for me (and the Diamond does it
with the comp knob at 1/3 of its range !!!)

&lt;iframe
width="640" height="385"
src="//www.youtube.com/embed/wGzRo94TvlQ?fs=1&amp;start="
frameborder="0"
allowfullscreen&gt;&lt;/iframe&gt;

« Last
Edit: May 08, 2012, 02:26:27 AM by Xavier »

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pedalgrinder

Posts:
91

Re:
better compressor pedal??

« Reply #116 on:
May 10, 2012, 02:27:23 AM »

yeah i agree the diamond
compressor is a nice one. What has been annoying
me is the guitar one is there but the bass diamond
compressor no one knows what has changed in it. I
want the bass one not the guitar one. If i start
looking at that one i will start modding it to try
and get it to work better with bass wishing i had
the exact recipe of the bass diamond compressor. I
think thats what has put me off building
one.

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