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Re: Colorsound - Power Boost / Overdriver

Posted: 18 Jun 2009, 23:17
by cpm
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Re: Colorsound - Power Boost / Overdriver

Posted: 19 Jun 2009, 00:39
by clintrubber
Thanks for the pics'n'files!
cpm wrote: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.
Won't make much difference, the involved caps are DC-blocking, not toneshaping. The 12k is already 'DC-less' because of the caps @ its other side.

Bye

Re: Colorsound - Power Boost / Overdriver

Posted: 20 Jun 2009, 16:01
by cpm
so, can anybody tell the values of the components in the pictures? (previous page)

Re: Colorsound - Power Boost / Overdriver

Posted: 25 Jun 2009, 11:04
by cpm
the colored cap looks like 47n?

Re:

Posted: 28 Jul 2009, 05:02
by jamiefbolton
Image

is that a 6.4+ cap or a 64+ cap

Re: Colorsound - Power Boost / Overdriver

Posted: 28 Jul 2009, 10:59
by clintrubber
The one you indicated looks a 25uF, but you might want to know the other one connected to the collector of TR2 ? That one looks a 6.4 uF, looking at the number-spacing & the point-style they use at other components.

Re: Colorsound - Power Boost / Overdriver

Posted: 05 Aug 2009, 15:28
by Aharon
Some links expired /are missing so I thought I'd refresh the thread with this schem,you probably know this one.
http://www.schematicheaven.com/effects/ ... driver.pdf
Aharon

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 00:09
by Electric Warrior
I just fought myself through dozens of Power Boost and Overdriver gut shots. Here's some variations of the circuit:
PBODschmeatics.png
any mistakes?

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 01:26
by analogguru
Electric Warrior wrote: any mistakes?
Yes... after a quick view at least the 22µF (4µ7) from the collector of the third transistor shouldn´t connect to the base instead it should be connected to the junction 4k7/0,01µF (one row to the left).

analogguru

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 02:04
by Electric Warrior
uh :slap:
That one used to be right, but I had mistakenly used the symbol for a regular capacitor. must have happend when I "fixed" it.
thanks a lot for spotting it right away, AG!

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 09:02
by tatter
Is there a major difference in the sound between the 3 versions? I've just built an Overdriver and love it.

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 11:57
by Electric Warrior
no idea, I didn't build one yet. I just had a close look at the circuit to get an overview. I think I'll go for the second version of the power boost..

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 12:30
by tatter
I have the 90s reissue of the Power Boost, it is 9v and the gain pot is 2k2. I think there are a few other minor differences as well.

Image

Image

Re: Colorsound - Power Boost / Overdriver

Posted: 06 Aug 2009, 22:04
by Electric Warrior
another update. the smaller electrolytics in the later versions are 10µF, not 4,7µF

Re: Colorsound - Power Boost / Overdriver

Posted: 07 Aug 2009, 13:22
by Dr Tony Balls
I built one of these for a friend using BC109s. Came out sounding pretty damn good, and before sending it to him I added a master volume out the side upon request.

Image

he quoted "it's the best distortion I've ever had". I dont know if i'd go THAT far...but its a still a rad pedal.

Re: Colorsound - Power Boost / Overdriver

Posted: 07 Aug 2009, 18:03
by pf_fan
Electric Warrior wrote:I just fought myself through dozens of Power Boost and Overdriver gut shots. Here's some variations of the circuit:
I hope you'll find those pics useful as well :)
http://www.megaupload.com/?d=S3OUCL39

Re: Colorsound - Power Boost / Overdriver

Posted: 07 Aug 2009, 20:55
by Aharon
Dr Tony Balls wrote:I built one of these for a friend using BC109s. Came out sounding pretty damn good, and before sending it to him I added a master volume out the side upon request.

Image

he quoted "it's the best distortion I've ever had". I dont know if i'd go THAT far...but its a still a rad pedal.


Hey Dr Tony ,did you just stripboard it and which schem did you use...?
Thanks
Aharon

Re: Colorsound - Power Boost / Overdriver

Posted: 07 Aug 2009, 21:09
by Dr Tony Balls
yup!, used this vero layout, which checked out against the original schematic that you posted.

http://aronnelson.com/gallery/main.php/ ... d.jpg.html

Re: Colorsound - Power Boost / Overdriver

Posted: 07 Aug 2009, 23:44
by Aharon
Thanks Dr Tony.
Aharon

Re: Colorsound - Power Boost / Overdriver

Posted: 08 Aug 2009, 02:31
by .Mike
I plan on building one of these. Out of curiosity, I modeled the three circuits with the gain up all the way to check out the difference in waveforms. In case anyone is interested, here are the results:

Image

I'll probably do the frequency response later, and if anyone is interested, I'll post that if/when I get it done.

:)

Mike