Author Topic: FV-24. FV-1 based pedal.  (Read 968 times)

deadastronaut

Re: FV-24. FV-1 based pedal.
« Reply #20 on: February 16, 2021, 12:49:25 PM »
^ cool, cheers alex, so a couple of 1n5817's should be ok then...


: marc, hmmmm....maybe, i'll have to see how i go, i'm not a coder by any means, im just using spincad, then exporting a hex file to programme the epproms with pickit2.

but yeah, you never know...

https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

Ice-9

Re: FV-24. FV-1 based pedal.
« Reply #21 on: February 16, 2021, 12:50:58 PM »
Hi Deadastro- The Fv-24 is looking really nice and sounds very nice as well. Congrats on getting it all built and working the way you wanted.

Regards the clamping diodes on the inputs of the FV-1 for p-p protection, I used to use BAT42 Schottky diodes but later pedal designs I ended up just not putting them in on newer designs as they are not really needed.

www.stanleyfx.co.uk

It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

stallik

Re: FV-24. FV-1 based pedal.
« Reply #22 on: February 16, 2021, 01:08:38 PM »
Really nice Rob. Do I need one? No. Will I build one anyway? Most likely :)
Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

Digital Larry

Re: FV-24. FV-1 based pedal.
« Reply #23 on: February 16, 2021, 01:30:19 PM »
Regards the clamping diodes on the inputs of the FV-1 for p-p protection, I used to use BAT42 Schottky diodes but later pedal designs I ended up just not putting them in on newer designs as they are not really needed.
The FV-1 reference schematic shows a 1k resistor in series with the inputs.  This may well serve to limit the potential of "large" input signals to destroy or lock up the chip.  It's just a guess.  I know it's also part of some LPF at the input.
Digital Larry
DSP tinkerer and former transistor twister

ElectricDruid

Re: FV-24. FV-1 based pedal.
« Reply #24 on: February 16, 2021, 02:04:59 PM »
Regards the clamping diodes on the inputs of the FV-1 for p-p protection, I used to use BAT42 Schottky diodes but later pedal designs I ended up just not putting them in on newer designs as they are not really needed.
The FV-1 reference schematic shows a 1k resistor in series with the inputs.  This may well serve to limit the potential of "large" input signals to destroy or lock up the chip.  It's just a guess.  I know it's also part of some LPF at the input.

Yeah, this makes sense too. The VCDO chip that I did used a 4K7 resistor in series like this to protect the ADC inputs. It limits the current that can flow through the *internal* protection diodes to a safe level, and thereby negates the need for *external* diodes. And (like in the FV-1 schematic) if you've got a resistor there, you might as well add a cap to ground and get some lowpass filtering to help remove any out-of-band noise.


bluebunny

Re: FV-24. FV-1 based pedal.
« Reply #25 on: February 16, 2021, 05:15:02 PM »
Really nice Rob. Do I need one? No. Will I build one anyway? Most likely :)

^ this     <sigh>
  • SUPPORTER
Ohm's Law - much like Coles Law, but with less cabbage...

Digital Larry

Re: FV-24. FV-1 based pedal.
« Reply #26 on: February 16, 2021, 05:57:58 PM »
Don't sigh!  I think of FV-1 projects as "solder once, tweak endlessly in code".  It's the final frontier and all that.   :icon_mrgreen:
Digital Larry
DSP tinkerer and former transistor twister

jonny.reckless

Re: FV-24. FV-1 based pedal.
« Reply #27 on: February 17, 2021, 03:32:40 AM »
Fantastic. I love those ambient sounds from around 7:30 onward and again around 9:35. So good.
It would be fabulous to have trails when switching presets.
« Last Edit: February 17, 2021, 03:43:45 AM by jonny.reckless »

bluebunny

Re: FV-24. FV-1 based pedal.
« Reply #28 on: February 17, 2021, 03:43:45 AM »
Don't sigh!  I think of FV-1 projects as "solder once, tweak endlessly in code".  It's the final frontier and all that.   :icon_mrgreen:

I was afraid of that...  Software is my day job, so coding isn't necessarily my idea of fun.  Having said that, I downloaded SpinCAD yesterday and had it up and running on Linux in no time...  Must.  Resist.  . . .
  • SUPPORTER
Ohm's Law - much like Coles Law, but with less cabbage...

deadastronaut

Re: FV-24. FV-1 based pedal.
« Reply #29 on: February 17, 2021, 05:08:13 AM »
^ cool , yeah its great that you can use spincad with just a wave file....

excellent for previewing/ testing patches..

i use a guitar wave with staccato and long chordy stuff...
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

Digital Larry

Re: FV-24. FV-1 based pedal.
« Reply #30 on: February 17, 2021, 09:39:20 AM »
It would be fabulous to have trails when switching presets.
Can't be done with a single FV-1.
Digital Larry
DSP tinkerer and former transistor twister

stallik

Re: FV-24. FV-1 based pedal.
« Reply #31 on: February 17, 2021, 01:56:22 PM »
Yup. Decided I definitely won’t be going down this rabbit hole.
.
.
.
No hurry with my order Rob ::)
Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

deadastronaut

Re: FV-24. FV-1 based pedal.
« Reply #32 on: February 17, 2021, 03:12:44 PM »
^  aha...its a good rabbit hole though.... :icon_mrgreen:

Will pop in post ...  8)
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

stallik

Re: FV-24. FV-1 based pedal.
« Reply #33 on: February 19, 2021, 04:51:41 AM »
That was quick Rob, lovely looking board
Insanity: doing the same thing over and over again and expecting different results. Albert Einstein