Colorsound - Tremolo

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Colorsound - Tremolo

Postby MoreCowbell » 12 Jan 2008, 03:39

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Postby soulsonic » 12 Jan 2008, 03:58

So, Q4 acts as a switch and shunts the signal to ground, and how much gets divided to ground is determined by the setting of the Depth pot? Clever. I wonder how it sounds compared to the LDR type. I expect it wouldn't have the same hysteresis effect that an LDR has because the on/off time constants would be faster. I wonder how it would sound if you used a FET for Q4? :hmmm:
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Postby R.G. » 12 Jan 2008, 04:20

Q4 is actually used in the variable collector-resistance region of it's characteristic. And inverted. Using transistors inverted (i.e. swapping collector for emitter) often produces better switch and variable resistance results in bipolars; an old trick from back when the only devices available for variable R and switching were bipolars.
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Postby dai h. » 12 Jan 2008, 12:02

that was one of the better (sounding) DIY'ed pedals I made from the mag(where the schematic is from). I tried to figure out how to get it to go faster but only had limited success (due to my own lack of technical understanding). Oh yeah, trying an R and C in series with the battery helped to make it sound a bit more "dimensional".
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Postby Stephengiles » 12 Jan 2008, 14:09

http://www.4shared.com/dir/5287188/698a ... sound.html

This is the circuit and parts placement on the Colorsound Tremolo I had - and sold for £100!
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Postby Stephengiles » 12 Jan 2008, 14:16

This is the circuit and parts placement on the Colorsound Tremolo I had - and sold for £100!

Image


Image
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Postby analogguru » 16 Jan 2008, 13:12

Pictures linked by more cowbell are not "vintage". They are from a 90´s reissue, which - like in many cases of colorsound "90´s-reissues" - hadn´t anything in common with the original boxes except the case... an example is the colorsound tonebender Reissue - a shame for the name Tonebender:

http://analogguru.an.ohost.de/001/schem ... der_RI.gif

THe graphics shown by stephen Giles represent a "pre-75" unit. The 77 -units had 4 transistors.

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Postby MoreCowbell » 16 Jan 2008, 16:28

Here you go AG... :)

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Postby analogguru » 16 Jan 2008, 16:56

That´s the 77 version ... to be exactly the pcb shown was produced on 10/12/77 :wink:

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Postby MoreCowbell » 16 Jan 2008, 17:06

I should go through my gut shots gallery and see what ones might be useful....
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Postby analogguru » 16 Jan 2008, 21:06

After retracing i have to say the schematic from stephen contains mistakes:

C and E of the "attenuation transistor" are reversed (as typically for this era). and the series resistor is 1k and not 4k7 - if it is correct in the tracing.

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Postby Stephengiles » 16 Jan 2008, 23:16

Possibly, but it's exactly as in the unit I had which worked :wink:
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Postby analogguru » 17 Jan 2008, 00:11

Stephengiles wrote:Possibly, but it's exactly as in the unit I had which worked :wink:


The part placement drawing or the schematic ?
They differ from each other.

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Postby Stephengiles » 17 Jan 2008, 09:20

analogguru wrote:
Stephengiles wrote:Possibly, but it's exactly as in the unit I had which worked :wink:


The part placement drawing or the schematic ?
They differ from each other.

analogguru


Part placement - mmmmmmmm thanks for noticing that!
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Re: Colorsound - Tremolo

Postby bootle » 11 Apr 2010, 14:45

THe graphics shown by stephen Giles represent a "pre-75" unit. The 77 -units had 4 transistors.


so just to clarify, the vintage pre-'75 unit had 3 trannies and the post '77 had 4?
is this the post '77 one?:
Image

how many were in the 90s re-issue and how did it compare to the earlier versions?

I read there was more of a volume drop on the 90s ones.
I just built a 3 tranny version from a dragonfly vero with a MPSA13 and two 2N5089s and it's sounds pretty good.
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Re: Colorsound - Tremolo

Postby pinio » 27 May 2011, 08:46

bootle wrote:
THe graphics shown by stephen Giles represent a "pre-75" unit. The 77 -units had 4 transistors.


so just to clarify, the vintage pre-'75 unit had 3 trannies and the post '77 had 4?
is this the post '77 one?:
Image

how many were in the 90s re-issue and how did it compare to the earlier versions?

I read there was more of a volume drop on the 90s ones.
I just built a 3 tranny version from a dragonfly vero with a MPSA13 and two 2N5089s and it's sounds pretty good.


Hello
I build simpler version this tremolo, but I'm not satisfied of his sound. Do You have printable PCB for "your" version?

I have few projects using KiCad. I will send on request :)
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Re: Colorsound - Tremolo

Postby lmkv15 » 02 Jun 2011, 09:57

Hi,
here are my version that i build. (3 trannys)
regards Uwe
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Re: Colorsound - Tremolo

Postby ansil » 02 Jun 2011, 12:36

have you seen the fulltone mods done on this pedal. i had mine traced out cause there was no way i was going to go crazy with this thing.

man way to many jumpers he had an unused board in this thing hadn't been populated. and built it i will have to show you the pics soon as my room mate gets up we can take some on his high res camera.

not a lot of mods on it did sub out a fet though instead one of the transistors
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Re: Colorsound - Tremolo

Postby uncleboko » 02 Jun 2011, 12:43

ansil wrote:have you seen the fulltone mods done on this pedal. i had mine traced out cause there was no way i was going to go crazy with this thing.

man way to many jumpers he had an unused board in this thing hadn't been populated. and built it i will have to show you the pics soon as my room mate gets up we can take some on his high res camera.

not a lot of mods on it did sub out a fet though instead one of the transistors


What exactly are you saying about jumpers? :roll: :roll: :roll:
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Re: Colorsound - Tremolo

Postby sonicvi » 02 Jun 2011, 15:54

Pic of the original I used to own, from '77.
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