Purple Chorus (Analog Bi Chorus) board for sale anywhere?

cooder

cooder

Well-known member
Hi there, has anyone a Purple Chorus (Analog Bi Chorus) board for sale or knows where I could get one please?
Thanks in advance!
 
cooder said:
Looks awesome @Cybercow I wish I had been aware about these earlier. Very tragic with Cees passing, way too early.
Click to expand...
Thanks. And yes, Cees was taken quite early.

Just before he released his Purple Chorus, I had worked up a dual/stereo chorus of my own. Using two heavily modified Small Clone clone PCBs from GuitarPCB, I managed to create the 'Stereophonic Gizmotronic Symphonic Harmonic Perambulator Dual Chorus'. While Cees' Purple Chorus uses a single MN3207 BBD chip, mine uses two of either the MN3007 or MN3207 BBD chips one on each of the two PCBs.

Dual-Chorus_2_Done_01.jpg Dual-Chorus_2_Gutshot_Done_00.jpg

If you want to build up one of these, I can provide more details and put you in touch with Spencer at AmplifyFun to get a finished, printed enclosure if you like.
 
Looks very cool too @Cybercow ! I'll keep it in mind, thanks for offer! I'll still see if someone has a spare Purple Chorus board for now.
And I would do my own enclosure graphics since shipping from US costs an arm and a leg to down here.
 
Cybercow said:
Thanks. And yes, Cees was taken quite early.

Just before he released his Purple Chorus, I had worked up a dual/stereo chorus of my own. Using two heavily modified Small Clone clone PCBs from GuitarPCB, I managed to create the 'Stereophonic Gizmotronic Symphonic Harmonic Perambulator Dual Chorus'. While Cees' Purple Chorus uses a single MN3207 BBD chip, mine uses two of either the MN3007 or MN3207 BBD chips one on each of the two PCBs.

View attachment 77712 View attachment 77713

If you want to build up one of these, I can provide more details and put you in touch with Spencer at AmplifyFun to get a finished, printed enclosure if you like.
Click to expand...
I would like to build one of these.
 
Me too.

I got an IG-message from Cees just before he passed; he was going to send me the files.
Alas, I'm not on IG much and didn't see the request for my email address in time.

I don't know how others feel about it, but I think it would be a tribute to his legacy to fab up some new boards and build them in tribute.
 
@Cybercow Do you still have board and build documents for your project? I’ve been interested in the the “Purple” but doesn’t seem a layout or pcb exists. I bout a used Ibanez BC-9 bi mode chorus but they ranges were a little wild and they chorus didn’t blend well together. It was noisy as well.
 
bluedmc777 said:
@Cybercow Do you still have board and build documents for your project? I’ve been interested in the the “Purple” but doesn’t seem a layout or pcb exists. I bout a used Ibanez BC-9 bi mode chorus but they ranges were a little wild and they chorus didn’t blend well together. It was noisy as well.
Click to expand...
Never got the Purple PCB from Cees. But the build docs can be found -> here <-
 
Cybercow said:
Never got the Purple PCB from Cees. But the build docs can be found -> here <-
Click to expand...
@Cybercow Yea I’ve seen the build docs. Thats what led me on a wild goose chase to find a cob. A shame there’s no pcb available but maybe one day we will see one. I’m not advance enough to create a proper layout.

I’m not familiar with Skidmark Pedals story except that he passed. My deepest sympathy to his family and all that knew him. From the sounds I heard on his demo, even on compressed YouTube recording, he must’ve really known what he was doing. The pedal sounded absolutely killer.
 
I got the circuit duplicated in KiCAD and paused midway through the layout (got distracted), but it's on my list to get it laid out soon. I've been working my way through all the skidmark pedals with public documentation. Once it's laid out and validated I'll share the Gerber with a Creative Commons license. Likely 1-2 months.
 
It took longer than I'd have liked, but I have the PCB mostly laid out. However, it looks like Cees laid out all the bypass footswitch wiring and jack wiring on the PCB itself, which I'd prefer to avoid (PPCB style). I've got a basic question.

Right now I do have the footswitch laid out as a reference following the pad layout on the build doc - you can see it's crowded.

1749107609070.png

In terms of traces that are actually going to the circuit and not just wiring pins or jacks together, there are four: IN, OUT, INVOUT, and MILC. IN/OUT are obvious, and this particular pedal has an inverted output, which is INVOUT. But I can't figure out what the heck MILC is or what it's doing on the footswitch! The layout has all the LEDs on the PCB.

Here's the relevant part of the circuit from Cees' build doc. It's part of the power section.
1749107749716.png

Any thoughts?

1749108000120.png
 
rwl said:
View attachment 96772

In terms of traces that are actually going to the circuit and not just wiring pins or jacks together, there are four: IN, OUT, INVOUT, and MILC. IN/OUT are obvious, and this particular pedal has an inverted output, which is INVOUT. But I can't figure out what the heck MILC is or what it's doing on the footswitch! The layout has all the LEDs on the PCB.

Here's the relevant part of the circuit from Cees' build doc. It's part of the power section.
View attachment 96773

Any thoughts?
Click to expand...
Not sure what "MILC" means, but looking at it, it appears to be just Cees' way of implementing the bypass LED. IMO, the 2N7000 is a bit of overkill with regard to driving the LED and his bypass switch wiring seems a bit unconventional is all.
 
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