Interested in OCT Distribution SKRM / Spin FV1 DSP Adapter?

[Neutron7]

I am going to have a few of these boards made for myself, I was wondering if anyone else will be interested. they would be around $15 - $25 depending on how many people want them.

This is an adapter to use Spin semiconductor FV-1 DSP "SKRM" effects board in a modular.

There are 3 different boards all identical but pre loaded with different effects. the effects are very clean and reverbs can have a long and quite nice decay (although it probably would not beat out a Bricasti M7)

http://www.oct-distribution.com/

those SKRM boards are $27.50 each and they will sell small quantities.

Functions:
Attenuate/limit the inputs with variable controls and clipping indicator.

Boost the output back to +-5v

Switch between the 8 effects. with Grayhill mechanical rotary binary switch,( or you could use 3 toggle switches to save money.)

Each effect can have 3 controls depending how it is programmed, these are the 3 pots on the right

Jacks are in1 in2 (normalled to 1) , out 1 , out 2. extra 4 jacks are a multiple.

Will work on Bridechamber "oops" 2u MOTM panels. or you can buy a blank MU and drill it or whatever, the board is also small enough to use on euro/frac, and I could have both pot spacings on there.

Final board would be double sided with plated through holes, have .com and MOTM connectors, (when using MOTM power the .com connector will have the 5v avaliable for other modules)
maybe small format power as well? i haven't looked in to that. the circuit will have no trouble working at +-12v anyways.

prototype.




Also you can get a FV-1 dev board for $200 or so and write your own effects, and there is an "unofficial, but disclosed by the manufacturer" trick to load them right on to the SKRM EEPROM with the pin header that is already in place.

[DGTom]

Sign me up

I've looked at those chips on the oct-distro site abit & they look like the ducks nuts.

In theory it'd be pretty easy to add VC over pretty much all the controls as well... it would add something like 16 op-amps.... but it should be doable.

This looks like a great way to get some FX in teh modules for cheap tho

[Neutron7]

voltage control of the pot voltage would be easy, however they told me that the voltage is only polled 10 times a second so you could not do audio rate changing of effect values(shame!)
on the good side, when i was listening to it and turning the knobs, i did not hear steppiness.

anyways, I can add voltage control of pot values to the board, and maybe voltage controlled wet/dry mix as well

[SepticUnderground]

mmm tasty....too bad I dont do DIY myself, but a fully build module sure seems interesting. Never can have enuf effects imo.


would be nice to have a 3 boards in 3 modules or even 3 in one module with a select switch etc.

[DGTom]

yeah, I'm thinking 3 modules, one of each FX board, yum

voltage control of the pot voltage would be easy, however they told me that the voltage is only polled 10 times a second so you could not do audio rate changing of effect values(shame!)

For the reverbs (my main interest) that'd be fine I'd say - I'm mostly thinking of the ability to dynamically control decay time etc. for differant sections - something like the makenoise PP or CGS proggrammer or a very slow sequencer / LFO.

on the good side, when i was listening to it and turning the knobs, i did not hear steppiness.

Awesome!!

anyways, I can add voltage control of pot values to the board, and maybe voltage controlled wet/dry mix as well

That would be fantastic!!! I think VC over the preset would be great - but of limited appeal, I'm betting _that_ really would result in clicks.

[Neutron7]

Well i spent the afternoon playing with this, and have noted a few things.

There are no clicks when you speed up and slow down delays, it just warps the sound out of tune until it catches up with itself, like analog

There are no clicks when changing programs so one could change programs with voltage control with an lm3915 and a priority encoder, or some other way to make a 3 bit ADC . (i can add that as an option if the board has enough space)

So far on 2 of the boards, there is no wet/dry mix assigned internally, so the wet/dry can be voltage controlled, as well as "external feedback" (although a lot of programs have internal feedback as well, so things could get a bit hairy if you had both turned up)

Provisionally, I have decided to this to save on panel space, and still be versatile.

2 control voltage bus inputs each with 0-10v or -5+5 switch
each control has 2 switches which enable voltage control from either or both of the control busses.

controllable things
control1
control2
control3
feedback
wet/dry
program change? maybe.



Do people even DIY Euro and Frac? should i bother trying to keep this small enough?

[Neutron7]

oops delete!

[oozitron]

I do DIY Frac! For me, size is rarely an issue. I make most of my modules 6" wide.

This sounds really interesting. I would buy (at least) one

Drew

[DGTom]

At this point Frac is mostly DIY I think. Apart from Blacet, a few one offs & BugBrand (which doesn't count really) we _have_ to DIY.

Size isn't really an issue here either.

Great news about the lack of clicks!
tbh an ADC would add alot to the board & maybe not everyone would use it?

VC wet / dry is awesome tho

[Neutron7]

At this point Frac is mostly DIY I think. Apart from Blacet, a few one offs & BugBrand (which doesn't count really) we _have_ to DIY.

Size isn't really an issue here either.

Great news about the lack of clicks!
tbh an ADC would add alot to the board & maybe not everyone would use it?

:

I will see if i can do it cheaper, those LM3915s are expensive.
If i cant do it cheap with current chips and 2 ICs or less i wont bother.

[emergencyofstate]

Sign me up too!

[clarke68]

Thanks for diving in to this...I'd be interested in 2 or 3 boards, depending on price.

I already have one of their boards...the SKRM-C8-G01...I was going to do something similar to this on protoboard, but I'd love having it done for me!

Switch between the 8 effects. with Grayhill mechanical rotary binary switch,( or you could use 3 toggle switches to save money.)

This can be done very cheaply with a $1 rotary pot from Futurlec and a 74HC148N (see their schematics if you haven't already)...is that how you have it set up?

[tragedybysyntax]

I'm in like flynt!

[a100user]

Very interested.

Any chance of some audio with the control inputs and whilst switching between programs?

[fonik]

i have one already sitting one on my desk, waiting to get utilized...

[glacial23]

I'm in for one of these.

[Neutron7]

Very interested.

Any chance of some audio with the control inputs and whilst switching between programs?

I am just breadboarding and testing the control voltage part before i commit it to the board, It will be a few days, barring stupidity/bugs/need to order parts..ok maybe a bit longer

[mckenic]

Wow!

This looks cool (and not too costly!) - interested if I could shoehorn into me euro

Dave

[Ebolatone]

Very interesting. There's always a need for good delays.

[janvanvolt]

Count me in (one) :-)

[tragedybysyntax]

And don't forget, this guy can make panels for everyone!

[scozbor]

hell yes i would buy at least one

[Dave Kendall]

Hi.

I'd be interested in one or two, particularly if all 3 POT parameters could be voltage - controlled. The CGS programmer or similar could do wonders in that department. If the CV circuitry isn't too complex, maybe have all 3 CV buffers on the PCB, and people could choose how many CV ins made it to the front panel.

Nice Project BTW 8_)

cheers,
Dave

[Luka]

Im semi interested.
So what your offering is just a pcb which routed outputs to panel mount jacks?

I just want a multi-effect stomp box that can handle modular levels and has cv inputs.

[wenzel]

I'm very interested, sign me up for one!