EEPROM Builder…I’m sorry if this is dumb…

itstimtime

itstimtime

Member
…but the algorithms I choose, does the chip come to me with those installed on it, or after purchase am I given code that I somehow upload to the chip after I receive it?

Again, sorry if this dumb (I didn’t see a direct answer in the forums and I haven’t heard back via email yet). I’ve been building clones & kits for friends for a couple years, but didn’t realize this was a thing. It got me very excited and curious as to what I could come up with.

Thank you,
Tim
 
Ordered one lol now I’ve just gotta dig through here to find momentary switch diagrams…assuming an fv-1 needs more than the normal hooking of up lugs 2 & 3 to whichever pot you wanna control.
 
itstimtime said:
Ordered one lol now I’ve just gotta dig through here to find momentary switch diagrams…assuming an fv-1 needs more than the normal hooking of up lugs 2 & 3 to whichever pot you wanna control.
Click to expand...
No comment here - I used the arachnid and spatialist PCBs as-is which work great
 
itstimtime said:
Ordered one lol now I’ve just gotta dig through here to find momentary switch diagrams…assuming an fv-1 needs more than the normal hooking of up lugs 2 & 3 to whichever pot you wanna control.
Click to expand...
It's a 0-3.3v control That's what the L78L33 is for. 3.3v source.
 
jwin615 said:
It's a 0-3.3v control That's what the L78L33 is for. 3.3v source.
Click to expand...
Excuse my ignorance, but this 3.3v source…is that a module I’d need for the switch to work or a spot on the board I’d need to find? My background is BYOC builds and just modding them with momentary switches as I described earlier. I can hardly read a schematic, but I’m addicted to YouTube tutorials I suppose. Thank you for any guidance you have!

-Tim
 
itstimtime said:
Excuse my ignorance, but this 3.3v source…is that a module I’d need for the switch to work or a spot on the board I’d need to find? My background is BYOC builds and just modding them with momentary switches as I described earlier. I can hardly read a schematic, but I’m addicted to YouTube tutorials I suppose. Thank you for any guidance you have!

-Tim
Click to expand...
I think it will be better if you start with explaining what you are trying to accomplish? Do you have a PCB with an fv-1?
Typical FV-1 circuits have up to 4 controls(pots) that are wired as voltage dividers to a 3.3v source. In 1, out 2 ground 3 I believe.
Each divider output feeds a control pin input on the fv-1, giving it a range of 0-3.3 volts as you sweep the pot.
You can use switched or buttons(momentary switches) or rotary switches with a bank of resistors IF the program(on the eeprom) is written to look for a binary or stepped input.
 
itstimtime said:
I have successfully finished a leprechaun and a circulator from PCB so far though 🤷🏻‍♂️
Click to expand...
Your eeprom won't work in either of those.
The leprechaun uses the fv-1 internal programs only.
If using 8 programs via eeprom, as mentioned before, go with the arachnid.
The madbean headtrip is also another good option. Bean is releasing an updated version in the coming weeks/days.
 
jwin615 said:
I think it will be better if you start with explaining what you are trying to accomplish? Do you have a PCB with an fv-1?
Typical FV-1 circuits have up to 4 controls(pots) that are wired as voltage dividers to a 3.3v source. In 1, out 2 ground 3 I believe.
Each divider output feeds a control pin input on the fv-1, giving it a range of 0-3.3 volts as you sweep the pot.
You can use switched or buttons(momentary switches) or rotary switches with a bank of resistors IF the program(on the eeprom) is written to look for a binary or stepped input.
Click to expand...
My first thought when I realized the EEPROM was a thing, was a Pythagoras circuit with let’s say delay, reverb, and chorus. Off the top of my head, I believe control 2 for all three effects is feedback & depth. I would like momentary there for quick oscillations, large reverb bursts, and trippy chorus on the fly.
 
jwin615 said:
Your eeprom won't work in either of those.
The leprechaun uses the fv-1 internal programs only.
If using 8 programs via eeprom, as mentioned before, go with the arachnid.
The madbean headtrip is also another good option. Bean is releasing an updated version in the coming weeks/days.
Click to expand...
Oh no, I wasn’t trying to mod anything in those 2 pedals. Was just stating I had some small experience with the fv-1 and having to source parts, etc
 
itstimtime said:
My first thought when I realized the EEPROM was a thing, was a Pythagoras circuit with let’s say delay, reverb, and chorus. Off the top of my head, I believe control 2 for all three effects is feedback & depth. I would like momentary there for quick oscillations, large reverb bursts, and trippy chorus on the fly.
Click to expand...
The Pythagoras comes with its own eeprom and that board only supports 3 FX. If you want 8 and are building a custom eeprom(with 8), go arachnid.
Use a spdt(on/on) momentary and an additional pot.
Then you can switch between two different pot setting momentarily.
Note, I had leg 3 and 1 flipped in previous comment.
Wire leg 3 of both pots to the leg 3 PCB pad of the pot you want to switch. Both leg 1s to the ground (leg 1 on pcb)
Switch the wiper from each pot with the footswitch.
That will give you a "normal" pot and a switch setting. It's a little more versatile that 100% only and really only adds 1 more part.
There are variations on this concept but this idea is usually reserved for audio.
Since we are dealing with DC, we can just flip the outputs of the dividers.
You could even use a 4pdt and flip between two "presets" of pots.

E

Thread 'Using a 4PDT to switch two pots'

I think it can be done, but I’m struggling to wrap my head around it.

I built a RAH clone from here and love it, I leave it on all the time. What I’d like to do is use a footswitch so that I can have a preset option.

The switch would change from the stock volume and gain pots to a different set of pots set up for more drive and lower volume. This could be done either with trim pots or full size pots

Any clue on if this is doable with a 4pdt switch?
 
jwin615 said:
The Pythagoras comes with its own eeprom and that board only supports 3 FX. If you want 8 and are building a custom eeprom(with 8), go arachnid.
Use a spdt(on/on) momentary and an additional pot.
Then you can switch between two different pot setting momentarily.
Note, I had leg 3 and 1 flipped in previous comment.
Wire leg 3 of both pots to the leg 3 PCB pad of the pot you want to switch. Both leg 1s to the ground (leg 1 on pcb)
Switch the wiper from each pot with the footswitch.
That will give you a "normal" pot and a switch setting. It's a little more versatile that 100% only and really only adds 1 more part.
There are variations on this concept but this idea is usually reserved for audio.
Since we are dealing with DC, we can just flip the outputs of the dividers.
You could even use a 4pdt and flip between two "presets" of pots.

E

Thread 'Using a 4PDT to switch two pots'

I think it can be done, but I’m struggling to wrap my head around it.

I built a RAH clone from here and love it, I leave it on all the time. What I’d like to do is use a footswitch so that I can have a preset option.

The switch would change from the stock volume and gain pots to a different set of pots set up for more drive and lower volume. This could be done either with trim pots or full size pots

Any clue on if this is doable with a 4pdt switch?
Click to expand...
Hmmm. I guess in my head I was thinking I could just have one side of the momentary run to pin 21 of the FV (POT1 input/feedback/dwell control) and the other side with a resistor to ground…would that not change the resistance seen to pin 21 on the FV
 
itstimtime said:
Hmmm. I guess in my head I was thinking I could just have one side of the momentary run to pin 21 of the FV (POT1 input/feedback/dwell control) and the other side with a resistor to ground…would that not change the resistance seen to pin 21 on the FV
Click to expand...
There's a few way to do that. I could see a few of them causing issues.
One, you could be switching a resistor in series or parallel with the pot, causing non-repeatable results. You could also potentially over current the 3.3 regulator, again. Depending on execution method.
You want to switch the voltage divider (pot)out for another voltage divider. Wther it's a pair of resistors or another pot or trimmer.
 
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