Dual-Chorus 2 (GuitarPCB 'Mini-Me' x2 plus max mods)

[Cybercow]

Dual-Chorus 2 (Mini-Me x2 plus max mods)

With all the known mods available on this pair of Mini-Me circuits, plus an "LFO Sync" mod, this dual chorus is a delightful motion-wave machine. Based originally from the Small Clone, Barry's take on this classic chorus circuit does exceedingly well to capture and deliver a good strong chorus effect. The mods just add to the glory.

With two chorus circuits, this pedal can be wired for:
1. Mono-In to Mono-Out for the two circuits to work in series.
2. Mono-In to Stereo-Out (individual L/R mono-outs) for parallel operation.
3. Stereo-In (individual L/R mono-ins) to Stereo-Out (individual L/R mono-outs) for parallel operation.
4. Use either circuit by itself.

The mods are as a follows:
1. Depth Range extender – swaps out C18 with 3 different cap values. (Reaches into flanger territory.)
2. Rate Range – adds another 2µ2 cap to C21 to cut the Rate (LFO speed) in half.
3. LFO Rate LED – added this LED subterranean (beneath the waterslide) to have a more subtle rate indicator.
4. Independent or synchronized LFO toggle to allow different speeds from each chorus circuit. The switch is a custom-wired 4P2T toggle.

Details of the mods (in schematic form) and gutshot follow . . . .

[LaceSensor]

crazy cool.

[gordo]

Cybercow!!  Good to see you back in these parts and a very strong showing here.  Very tasty project and your usual killer enclosure work.

[Cybercow]

Cybercow!!  Good to see you back in these parts and a very strong showing here.  Very tasty project and your usual killer enclosure work.

Thanks Gordo. Been busy with a Rockman X100 revival. Developed a working sequential logic stompswitch circuit to cycle thru the MODE and FX options - no more reaching over to a switch by hand. We got some original X100 (rev 10) PCBs and have been hand-populating and building them out as a stompbox. Six of the prototypes are now in the wild and we're working on a v2 with mostly SMD components - except for the BBDs. We've also a v3 in the works to replace the BBDs with a pair of FV-1 DSPs for full stereo FX with a lot more options besides just the original "Chorus, Both & Echo" options.

Between the different X100 planning/building sessions, I squeeze in projects like this one.

[LaceSensor]

struggling to understand the first part and want to do something similar with vibrato...

With two chorus circuits, this pedal can be wired for:
1. Mono-In to Mono-Out for the two circuits to work in series.
2. Mono-In to Stereo-Out (individual L/R mono-outs) for parallel operation.
3. Stereo-In (individual L/R mono-ins) to Stereo-Out (individual L/R mono-outs) for parallel operation.
4. Use either circuit by itself.

are all these options present as you have it built? I cant see how....
OR just that you could in theory wire it as any of those? From what I can tell you have it wired so you can have either option (1) or (3). How are you getting option 2? thanks

[Cybercow]

struggling to understand the first part and want to do something similar with vibrato...

With two chorus circuits, this pedal can be wired for:
1. Mono-In to Mono-Out for the two circuits to work in series.
2. Mono-In to Stereo-Out (individual L/R mono-outs) for parallel operation.
3. Stereo-In (individual L/R mono-ins) to Stereo-Out (individual L/R mono-outs) for parallel operation.
4. Use either circuit by itself.

are all these options present as you have it built? I cant see how....
OR just that you could in theory wire it as any of those? From what I can tell you have it wired so you can have either option (1) or (3). How are you getting option 2? thanks

Yes, all the options are available on this build. Option 2 is achieved by by using the first Input jack, then taking the outs from the two output jacks. Note there is a switching-jack used at the 2nd input.

[jimilee]

That is fantastic inside and out!


Sent from my iPhone using Tapatalk

[LaceSensor]

struggling to understand the first part and want to do something similar with vibrato...

With two chorus circuits, this pedal can be wired for:
1. Mono-In to Mono-Out for the two circuits to work in series.
2. Mono-In to Stereo-Out (individual L/R mono-outs) for parallel operation.
3. Stereo-In (individual L/R mono-ins) to Stereo-Out (individual L/R mono-outs) for parallel operation.
4. Use either circuit by itself.

are all these options present as you have it built? I cant see how....
OR just that you could in theory wire it as any of those? From what I can tell you have it wired so you can have either option (1) or (3). How are you getting option 2? thanks

Yes, all the options are available on this build. Option 2 is achieved by by using the first Input jack, then taking the outs from the two output jacks. Note there is a switching-jack used at the 2nd input.

can you sketch how this is achieved at all ? I cant figure out how you do it without active splitting / buffering.
Just for the record I know how switching jacks work and I still can see how you only need one, too - surely you need one on the output as well as the inpt side for summing to mono / allowing independant use of the circuits?? thanks

[Cybercow]

can you sketch how this is achieved at all ? I cant figure out how you do it without active splitting / buffering.
Just for the record I know how switching jacks work and I still can see how you only need one, too - surely you need one on the output as well as the inpt side for summing to mono / allowing independant use of the circuits?? thanks

The signal of the first circuit simply feeds into the second circuit. By taking the first out to one amp and the second out to a second amp, there is a "pseudo-stereo" (psycho-acoustic) output via the two outs. Both circuits have to be engaged. I never drew up a formal wiring diagram. I just thought of what I wanted it to do and wired it accordingly.

Inserting another signal plug into the second input breaks the feed-thru from the first circuit and creates two separate chorus circuits.

Tho I suppose with another switch one could easily re-route the first input to both chorus circuits instead of having both circuits in series for the stereo.

[Thewintersoldier]

This is really neat from a conceptual and execution standpoint. It's like an analogman bi-chorus but built by lovetone! outstanding.