Colorsound - Power Boost / Overdriver

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: Colorsound - Power Boost / Overdriver

Postby sonicvi » 09 Apr 2009, 09:19

You can get Sprague caps in 25uF, but 22uF works just fine.
sonicvi
Solder Soldier
 
Posts: 160
Joined: 30 Dec 2007, 08:17
Has thanked: 0 time
Have thanks: 12 times

Re: Colorsound - Power Boost / Overdriver

Postby controller700 » 09 Apr 2009, 09:48

Okay, thanks! I´ll try the 22uF.

I also found that layout:
Image

There is C13 in parallel to the bass pot, and that is also shown in the Colorsound Schematic, but the Prescription pedal doesn´t have it... So what would you recommend? Add C13, or leave it?

For the Transistors my plan is to test 2N3904 (like Prescription uses), BC547C (alternative for BC184) and BC549B (alternative for BC169). Good idea? :hmmm:
User avatar
controller700
Breadboard Brother
 
Posts: 67
Joined: 29 Dec 2008, 16:49
Location: Germany
Has thanked: 3 times
Have thanks: 0 time

Re: Colorsound - Power Boost / Overdriver

Postby clintrubber » 09 Apr 2009, 16:13

I stumbled on the Colorsound Overdriver and thought it'd be a pretty straightforward build.
It will still be, but I was nevertheless surprised by the amount of circuit-variations (-errors ?) around.
I assume these originate from variations in original pedals over the years.

For instance:

* the transistors: while their exact name won't matter too much I guess (BC109/184/169/2N2222 etc),
I do expect a somewhat bigger (to even large) influence of the additions: -B or -C types (reflecting the current gain).

Have their been 'preferred current gains' around ? I know that this matters more for Ge-type FuzzFace circuits, but expect that for a Si-version it's still an issue as well (and that's what this is: a variation on the FuzzFace-topology plus EQ)
OK, 'adjust to taste' will be the approach, but starting from a decent set of values would be nice. Who knows more here?

* the 500 pF capacitor is 200 pF in the original old 1971 Colorsound schematic

* various resistors have different values


Bye,

Peter
User avatar
clintrubber
Breadboard Brother
 
Posts: 94
Joined: 08 Oct 2008, 20:21
Location: The Netherlands
Has thanked: 13 times
Have thanks: 4 times

Re: Colorsound - Power Boost / Overdriver

Postby clintrubber » 09 Apr 2009, 16:16

controller700 wrote:Okay, thanks! I´ll try the 22uF.
For the Transistors my plan is to test 2N3904 (like Prescription uses), BC547C (alternative for BC184) and BC549B (alternative for BC169). Good idea? :hmmm:


Hi,

If you go BC547C or BC549B you could also try BC550C or BC550B for potentially a bit lower noise (at least guaranteed by spec).

Bye,

Peter
User avatar
clintrubber
Breadboard Brother
 
Posts: 94
Joined: 08 Oct 2008, 20:21
Location: The Netherlands
Has thanked: 13 times
Have thanks: 4 times

Re: Colorsound - Power Boost / Overdriver

Postby sonicvi » 09 Apr 2009, 17:25

I tried BC109, BC184L,BC184C,BC169B, and 2n3904 in my clone and honestly I couldn't hear a significant difference between any of them.
sonicvi
Solder Soldier
 
Posts: 160
Joined: 30 Dec 2007, 08:17
Has thanked: 0 time
Have thanks: 12 times

Re: Colorsound - Power Boost / Overdriver

Postby clintrubber » 09 Apr 2009, 17:39

Perfect, less transistor-swapping, more playing ! :D
User avatar
clintrubber
Breadboard Brother
 
Posts: 94
Joined: 08 Oct 2008, 20:21
Location: The Netherlands
Has thanked: 13 times
Have thanks: 4 times

Re: Colorsound - Power Boost / Overdriver

Postby RnFR » 15 Apr 2009, 19:09

clintrubber wrote:I stumbled on the Colorsound Overdriver and thought it'd be a pretty straightforward build.
It will still be, but I was nevertheless surprised by the amount of circuit-variations (-errors ?) around.
I assume these originate from variations in original pedals over the years.

For instance:

* the transistors: while their exact name won't matter too much I guess (BC109/184/169/2N2222 etc),
I do expect a somewhat bigger (to even large) influence of the additions: -B or -C types (reflecting the current gain).

Have their been 'preferred current gains' around ? I know that this matters more for Ge-type FuzzFace circuits, but expect that for a Si-version it's still an issue as well (and that's what this is: a variation on the FuzzFace-topology plus EQ)
OK, 'adjust to taste' will be the approach, but starting from a decent set of values would be nice. Who knows more here?

* the 500 pF capacitor is 200 pF in the original old 1971 Colorsound schematic

* various resistors have different values


Bye,

Peter

i built one up with 109Cs, and i thought it was rather misbiased sounding.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO
User avatar
RnFR
Old Solderhand
 
Posts: 5138
Joined: 09 Jan 2008, 07:02
Location: Inner Earth
Has thanked: 150 times
Have thanks: 174 times

Re: Colorsound - Power Boost / Overdriver

Postby clintrubber » 15 Apr 2009, 20:40

RnFR wrote:i built one up with 109Cs, and i thought it was rather misbiased sounding.


Thanks for sharing. Ehhhm, so high hFE is not the way to go. Which types did you end up with ?

Thanks
User avatar
clintrubber
Breadboard Brother
 
Posts: 94
Joined: 08 Oct 2008, 20:21
Location: The Netherlands
Has thanked: 13 times
Have thanks: 4 times

Re: Colorsound - Power Boost / Overdriver

Postby controller700 » 16 Apr 2009, 22:26

A friend will borrow me his Prescription Overdriver in the next days.

I will analyze it to the core, and if I like it´s sound I´ll maybe build a clone of the clone...

My report will come... :secret:
User avatar
controller700
Breadboard Brother
 
Posts: 67
Joined: 29 Dec 2008, 16:49
Location: Germany
Has thanked: 3 times
Have thanks: 0 time

Re: Colorsound - Power Boost / Overdriver

Postby cpm » 17 Apr 2009, 00:13

RnFR wrote:i built one up with 109Cs, and i thought it was rather misbiased sounding.


and....
did you get to bias it?

i put 109B and it sounded misbiased with stock values, but adjusting collector resistors got it right
User avatar
cpm
Resistor Ronker
 
Posts: 277
Joined: 29 Oct 2008, 10:55
Location: spain
Has thanked: 0 time
Have thanks: 51 times

Re: Colorsound - Power Boost / Overdriver

Postby JimiB » 17 Apr 2009, 23:43

so where are your voltages now on the C,B, and E of your trannies?
JimiB
Solder Soldier
 
Posts: 205
Joined: 31 Dec 2007, 03:57
Has thanked: 0 time
Have thanks: 5 times

Re: Colorsound - Power Boost / Overdriver

Postby cpm » 18 Apr 2009, 00:32

~5v on 2nd and 3rd transitors C
User avatar
cpm
Resistor Ronker
 
Posts: 277
Joined: 29 Oct 2008, 10:55
Location: spain
Has thanked: 0 time
Have thanks: 51 times

Re: Colorsound - Power Boost / Overdriver

Postby analogguru » 18 Apr 2009, 00:58

RnFR wrote:i built one up with 109Cs, and i thought it was rather misbiased sounding.

The (original) Power Boost was running on 18V while later the circuit was tweaked in the Overdriver to work on 9V only.

hfe shouldn´t have a big influence in this circuit (as long as it is not too low).

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
analogguru
Old Solderhand
 
Posts: 3285
Joined: 26 Jun 2007, 14:58
Has thanked: 0 time
Have thanks: 116 times

Re: Colorsound - Power Boost / Overdriver

Postby RnFR » 18 Apr 2009, 23:28

cpm wrote:
RnFR wrote:i built one up with 109Cs, and i thought it was rather misbiased sounding.


and....
did you get to bias it?

i put 109B and it sounded misbiased with stock values, but adjusting collector resistors got it right

yeah, i eventually rebiased and got it better, but it was a ways back and i never ended up boxing it up.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO
User avatar
RnFR
Old Solderhand
 
Posts: 5138
Joined: 09 Jan 2008, 07:02
Location: Inner Earth
Has thanked: 150 times
Have thanks: 174 times

Re: Colorsound - Power Boost / Overdriver

Postby Otto » 05 Jun 2009, 20:31

Has anyone converted this circuit to positive ground? I'd like to have a stereo jack acting as a switch on the input side. I could wire the ground from the DC-socket through the stereo jack, but the problem is that I'm using a metal housing for the circuit so the DC-socket is grounded with both jack sleeves all the time.
Otto
 
Posts: 1
Joined: 05 Jun 2009, 20:13
Has thanked: 0 time
Have thanks: 0 time

Re: Colorsound - Power Boost / Overdriver

Postby cpm » 17 Jun 2009, 13:13

i had the chance to open one ot the newer Overdriver, and took some shots
from memory, in a quick look, i saw 47uF axial for the caps (and one 15uF), will check later for more components values.
pots were 2k2 rev log for gain, both 100k for tones, and 10k volume
transistor BC1xx (158? 168?...)

is it ok to upload hig-res pictures for the insides? or better link from an external server?
should it go into the "modern" subforum, as its a newer reissue??
User avatar
cpm
Resistor Ronker
 
Posts: 277
Joined: 29 Oct 2008, 10:55
Location: spain
Has thanked: 0 time
Have thanks: 51 times

Re: Colorsound - Power Boost / Overdriver

Postby Bernardduur » 17 Jun 2009, 21:50

Would love to compare em to my '96 model of which the pics should be around here.
'No more....... loud music.......'
Bernardduur
Transistor Tuner
 
Posts: 1141
Joined: 24 Aug 2007, 08:36
Location: Losser.........
Has thanked: 87 times
Have thanks: 488 times

Re: Colorsound - Power Boost / Overdriver

Postby clintrubber » 18 Jun 2009, 00:02

cpm wrote:i had the chance to open one ot the newer Overdriver, and took some shots
from memory, in a quick look, i saw 47uF axial for the caps (and one 15uF), will check later for more components values.
pots were 2k2 rev log for gain, both 100k for tones, and 10k volume
transistor BC1xx (158? 168?...)

is it ok to upload hig-res pictures for the insides? or better link from an external server?
should it go into the "modern" subforum, as its a newer reissue??


Hi,

If you have the opportunity for an external link then that'd always be good, dunno about hi-res & attachment limitations here.

Thanks !
User avatar
clintrubber
Breadboard Brother
 
Posts: 94
Joined: 08 Oct 2008, 20:21
Location: The Netherlands
Has thanked: 13 times
Have thanks: 4 times

Re: Colorsound - Power Boost / Overdriver

Postby RnFR » 18 Jun 2009, 01:27

just keep it in this thread. we like to keep everything nice and simple here. well as simple as you can get with all of the subforums. :wink:
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO
User avatar
RnFR
Old Solderhand
 
Posts: 5138
Joined: 09 Jan 2008, 07:02
Location: Inner Earth
Has thanked: 150 times
Have thanks: 174 times

Re: Colorsound - Power Boost / Overdriver

Postby cpm » 19 Jun 2009, 00:14

I forgot to take photo of the box :slap:
also couldnt measure voltages, .. i hope the owner doesnt get to know how i disassembled his box :mrgreen:

This is what i got for the schematic. The board says "POWERBOOST 96"
Its basically the same schem as the one i already had for the powerboost, noted "issue 1 14-6-71", but many different values.
Notice the connection of that 12k feedback resistor now it goes right into the gain pot, not to the emitter of Q1 like the old schem.

Also there are three values that i cannot read from the photos, so please have a look yourselves
You do not have the required permissions to view the files attached to this post.

For this message the author cpm has received thanks:
skumberg (04 May 2011, 12:39)
User avatar
cpm
Resistor Ronker
 
Posts: 277
Joined: 29 Oct 2008, 10:55
Location: spain
Has thanked: 0 time
Have thanks: 51 times

PreviousNext

Return to Vintage Stompbox Corner ( ... - 1975)

Who is online

Users browsing this forum: No registered users and 4 guests