Dunlop Rotovibe schematic

[evening]

Anyone have one? I've searched the usual places...
I'm looking to mod the pedal to provide more gain.

thx

jmw

[John G]

Hi,
I'm sure I saw a schemo over at DIY Stompboxes site a couple of weeks ago.............could be wrong though.
John

[evening]

Thanks for the heads up!

I missed that on diystompboxes last night.

[Enzo]

Here's one in a pdf file

[evening]

Hmmm - looks like I have a rev. D board... schem says rev E

Thought this would be an easy resistor swap - change R21 to a larger value and get some more gain. - ha

Comparing my pedal to the schematic shows that I have a different board.
TL074's instead of TL062, other component designations seem different as well. I'm beyond my present skill level.

Any suggestions on how to proceed? just looking to add a little boost to the circuit.

jmw

[Enzo]

There are more than one version of this model. This is the only schematic I have, sorry it is the same one.

[evening]

No problem Enzo,

Just another (somewhat annoying) learning opportunity for me.
I emailed Dunlop but they have a "no schematics, no help with mods" policy.
Which is understandable, at least from a business perspective.

[John G]

Hi,
If you can find the equivalent resistor to "R36" on your unit, I think ?? that by bridging it with another reistor of say 100K (to start with, go higher or lower if too much or too little ) may do the trick of increasing gain............not sure what it will do to the filter though.
John

[John G]

Hi,
I have just seen a reply to your post over at DIY forum, and the reply there is a better way than what I have suggested, so the 5K trimmer is the way to go at the output replacing the two fixed resistors.
I didn't see the voltage divider when I first looked at the schemo.
Another way to achieve control would be to lift either end of R44 and insert (in series) a fixed or variable resistor.
John

[evening]

thanks - i'll look into that.

[gladosz123]

Thought this would be an easy resistor swap - change R21 to a larger value and get some more gain. - ha

Comparing my pedal to the schematic shows that I have a different board.
TL074's instead of TL062, other component designations seem different as well. I'm beyond my present skill level.

Any suggestions on how to proceed? just looking to add a little boost to the circuit.

jmw

TL062 nehmen wenig strom

Tl062 vs Tl074 = mA < mA

Sound ist gleich

[wozlaser]

swap the resistor out with a pot and experiment! get fearless! be a modder, don't look back! I've never not made any of my pedals better somehow, and I learned as I did it.