Colorsound - Power Boost / Overdriver

[cpm]

...

[clintrubber]

Thanks for the pics'n'files!

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

[cpm]

so, can anybody tell the values of the components in the pictures? (previous page)

[cpm]

the colored cap looks like 47n?

[jamiefbolton]

is that a 6.4+ cap or a 64+ cap

[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.

[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

[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?

[analogguru]

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

[Electric Warrior]

uh
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!

[tatter]

Is there a major difference in the sound between the 3 versions? I've just built an Overdriver and love it.

[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..

[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.

[Electric Warrior]

another update. the smaller electrolytics in the later versions are 10µF, not 4,7µF

[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.



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.

[pf_fan]

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

[Aharon]

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.



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

[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

[Aharon]

Thanks Dr Tony.
Aharon

[.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:



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



Mike