Spin semiconductor fv-1

[MetalGuy]

Sean, did you see my layout yet, should help getting started with this chip as a pedal.

Good job on that one. If I remember this is the encoder that goes with it:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=GH3074-ND

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=948-0431&SEARCH=&MPN=25LB22%2DH&DESC=25LB22%2DH&R=948%2D0431&sid=480E7C0046DFE17F

[SeanCostello]

Sean, did you see my layout yet, should help getting started with this chip as a pedal.

COOL! Are you going to have boards available for this project? I will try making one of these next week.

Is there any room on the board for output buffers? Or, do you think that a dual-ganged pot could mix input and output in the analog realm without too much loss?

Again, very exciting!

Sean

[Fp-www.Tonepad.com]

i'd definitely try the dual ganged pot mix.

I didn't want to add too much to it because there's always going to be a long list of features to add, i kept it really simple. Besides, there's two buffers on the board, you can use one of them for input an the other one for output. For mono use, the inputs should be tied together, which frees that extra buffer for output.

[MarcoMike]

Hi guys! I'm a total newbie about digital stuff, but I saw this new project at Francisco's and thought this may be my first digital experience...

reading the datasheet I couldn't understand how you select the programs... it seems pins 16,17,18 are the ones... but on the proto-board it looks like there is a sort of pot to select the program... well, how does it work?!? 

thank you!

[octfrank]

The device on the dev board for program selection is a rotary encoder, not a pot. It is a digital output device so it connects to the program selection pins to drive them high/low to select the program.

[Fp-www.Tonepad.com]

or you can use spst switches instead, even jumpers would work.

Look at the datasheet for program assignments.

[MetalGuy]

External free programs found on Spin's website are much more interesting by the way.
The other way to select programs is to use an ordinary rotary encoder in combination with a small MCU /like PIC16F629 for example/.

[MarcoMike]

Thank you guys! I think the three swithes array suits me better..

now it seems my problem is to find the chip 

[puretube]

US: small bear
EU: pro fusion

up to you, to check the shipping costs... (  )

[MarcoMike]

It's quite funny... shipping costs within europe are double the price of the chip...

[Fp-www.Tonepad.com]

Get some more stuff, that way the chip/ship ratio will improve.

[amz-fx]

I posted a short mod on the Spin forum (and in my blog) on how to double the amount of user-programmable memory for the FV-1.

Enjoy!

-Jack

[scratch]

I was thinking of replacing the pots with 8-bit DACs, driven by up/down binary counters, each program would have it's own set of counters (with CMOS I might even be able to save the counter info with battery backup) ... I've got a whole tube of 7-segment displays, I figure I could use these to monitor the outputs of the counters ...

BUT, I can't find a display driver that will do hex! The closest I've found are displays made by Avago with built-in decode/driver, but at $23.00(ish) per digit, not going to happen.

Anybody ever come across a solution other than Micro-controllers ?

Thanks,

[octfrank]

Solutions off the top of my head:

DM9368 from Fairchild if you can find any
Programmable logic (i.e 22V10, cheap FPGA)
EEPROM (inputs to address lines, outputs to 7-segment)

Frank
OCT Distribution

[scratch]

Octfrank,

been unable to find the DM9368 (would have been the best solution, and surprising that it didn't catch on!)

the 22V10/CPLD is cheaper, but I then have to invest in a programmer, and some code generation.

EEPROM, more expensive, same footprint as 22v10, but way easier to implement, I might just pursue this avenue,

thanks for the ideas!

[amz-fx]

Does anyone know of a commercially available box using the FV-1 chip?  I want to buy one for experimentation purposes.

Thanks, Jack

[tiges_ tendres]

Does anyone know of a commercially available box using the FV-1 chip?  I want to buy one for experimentation purposes.

Thanks, Jack

I think the EHX Holy Stain uses one.

[amz-fx]

I think the EHX Holy Stain uses one.

Thanks. Anyone here have one that can confirm that?

regards, Jack

[eddieod]

Hi all,

I've got two fv-1's but I just can't get them to work! Power supply is ok, everything is connected as it's supposed to be but no sound coming out of it....any ideas? Are these devices ultra sensitive to static and/or heat during soldering?

Any help will very much be appreciated...

Edwin

[octfrank]

Edwin,

Email or post on the Spin website forum a full description and pdfs of the schematic and board layout.