Jangle Switch on a Tonepad Ross Comp?

[mipo]

I have a Tonepad Ross comp (http://www.tonepad.com/getFile.asp?id=9) clone I build several years ago and, since I understand that the Janglebox compressor is a modified Ross/Dynacomp compressor, I'd like to add a jangle switch to it. Is this possible?

[R.G.]

Maybe, at some level. One way is to wire a switch that replaces the whole Ross compressor circuit with the janglebox. If one knew exactly what a Ross and a Janglebox were in detail (that is, had the schematics) one could rig some number of switches to make the changeover.

If one had the two schematics.

[JustinFun]

All you need to do (I believe) is make the 1nf cap parallel with the 150k resistor (just before Q2) switchable.

When I did it, I used an on-off-on with a 1nf (classic) and 470-ish-pf (bright) to give 3 modes - the jangle mod does give some extra hiss so this way you get another bright but less noisy option thrown in.

Just thinking - could you use a pot to sweep between the 1nf and no cap? might give some more flexibility?

[mipo]

Maybe, at some level. One way is to wire a switch that replaces the whole Ross compressor circuit with the janglebox. If one knew exactly what a Ross and a Janglebox were in detail (that is, had the schematics) one could rig some number of switches to make the changeover.

If one had the two schematics.

Point taken. 

[mipo]

All you need to do (I believe) is make the 1nf cap parallel with the 150k resistor (just before Q2) switchable.

Ah, so that's the one. Cool, thanks.

When I did it, I used an on-off-on with a 1nf (classic) and 470-ish-pf (bright) to give 3 modes - the jangle mod does give some extra hiss so this way you get another bright but less noisy option thrown in.

What does the middle/off mode give you or sound like?

Just thinking - could you use a pot to sweep between the 1nf and no cap? might give some more flexibility?

Perhaps; I'm a bit crammed for space in the enclosure as it is, though, but maybe. Would each cap have one leg on pot lug 2, then the remaining on 1 and 3, respectively?

[JustinFun]

The 'off' position is the 'jangle box' mode, the 470pf (experiment with values - not sure what I used now) is a 'brighter than stock but less bright than jangle' mode). As f

[JustinFun]

Sorry - finger slipped!

As for the pot I'm not sure - but I think you could pan between the 2 caps by connecting leg 1 of cap 1 to lug 1 of the pot, leg 1 of cap 2 to lug 3 of the pot, then run a wire from lug 2 to one of the cap holes on the pcb, and another wire from leg 2 of both caps to the other hole on the pcb.

Alternatively you might be able to wire a pot as a variable resistor in series with the 1nf cap? I don't know, others here are much better at that sort of thing than me.

[mipo]

As for the pot I'm not sure - but I think you could pan between the 2 caps by connecting leg 1 of cap 1 to lug 1 of the pot, leg 1 of cap 2 to lug 3 of the pot, then run a wire from lug 2 to one of the cap holes on the pcb, and another wire from leg 2 of both caps to the other hole on the pcb.

Alternatively you might be able to wire a pot as a variable resistor in series with the 1nf cap? I don't know, others here are much better at that sort of thing than me.

I may experiment with that before I re-box it just to see what happens; thanks.

[Mustachio]

I built a dynacomp with the jangle mod on vero a while back , one of my favorites too!

Here's the vero I used theres a lil discussion under it that might help.

I'd suggest looking at what the jangle switch connects to on the vero and which components coincide with from the tonepad layout.

[Mustachio]

haha oops forgot to link it

http://www.sabrotone.com/?attachment_id=601