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To say this plainly, this needs a part that uses 90% of it's resistive scale values between 100K and 1Meg ohms. The xvibe has 90% of it's usable scale between 1 and 5000 ohms … not helpful when in parallel with a 220K resistor.

ok - quick summary of the xvibe part : 1 mA (low light) into the LED allows ~5k ohms … at 40 mA (bright light) into the LED brings the resistance to 1.5 ohms. Zero light from the LED is ~10 megohms resistance. This is my fault, for assuming the xvibe part had the correct values internally...

OK … so I have the new CDXL "rev.2" board. I built it with exact value components, wired it into a case, and … nope. It passes audio thru the tl072 just fine, but no quack. So, I replaced the tl072 and xvibe with spares, and went again. Still no quack. I put a red LED in place of the xvibe...

Did your friend's new board work after building it ? Did you use an Xvive brand optocoupler ? -- Asking for my guitar

Belton Brick uses three, at slightly different VCO speeds, to simulate real springs.

Some of us use the clones here as a launching point for doing mods, it's faster to start with a board ready-made. It's also fun to make combinations of the boards here, in larger pedal boxes. BTW, a shame about PPP doing the 25 minimum thing. I will peel their sticker off my car. .

Thanks for the input, everyone. I will start looking at the items you listed.

Do any of the PPcb projects use a PT2399 ? - just curious - and if not, why ?

I'm doing something with an external microprocessor called Teensy (Arduino-based) that takes over the pots, the switches, and the master clock. It can mute or reset the fv-1, monitor the audio signal and clipping, switch effect eeproms on the fly, tap tempos, and remember your settings as a...

PedalPCB- are you folks still working on tap-tempo ? Are you using an external cpu to calculate, or an fv-1 eeprom program ? Will we see it for sale soon ? (love the idea)

May I suggest, insert a regular red LED in the holes without soldering, to test the VACTROL orientation for actual functionality. This is how I discovered I had a bad board in the first place.

*** Is there an easy way to determine if these are indeed the earlier boards ? *** If so, I bought two of 'em, and would enjoy having the corrected boards sent to me : Order #27399 was placed on October 9, 2019 and is currently Completed. If you want to throw in a couple of Arachnid boards...

I put a red led in place of the vactrol to see how sensitive the input is on the CDXL circuit. Well, the answer seems to be "zero" - no LED flashes at all. The LED dimmed with the "range" knob, but never flashed. I removed the 4.7 uF cap from the board, and measured - pin one of the tl072 is...

Can we post schematics from other places ? I believe this is very, very close to what you want. Use Xvive Audio VTL5C3/2 Dual Element Opto-Coupler.

THAT is a VERY important question ! What are the dimensions of the switch-mounted eeprom board ? Must it occupy space near the stomp switch where there is no PCB above it ? What is the height of the socket-mounted onboard assembly ? What keeps it firmly mounted to the DIP-8 socket ? PPCB...

Chuck, how did you wire the expression pedal onto the arachnid ? Is it part of one of the three effect knobs ? I've thought about doing this, and would like to hear your ideas.

I watched the same video, and thought "what a crappy way to demo a keyboard effect" (using a guitar).

I looked and listened on YouTube. My vote goes for the SpinCycle pedal from Experimental Noize. It's a bit larger footprint than the boards I see here, possibly it could be adapted to a smaller size. It seems to use a combo of analog distortion, digital LFO effecting both volume and phase...

I'd say option two, because when you use I2C (SDA, SCL) between two chips, it's best practice to keep all connections as short as possible, and not to run the 2-wire signal through physical disconnects; sockets introduce problems, as do separate ground planes. Even at the protocol's lowest...

Whichever choice, make sure to leave enough vertical space for an 8pin dip socket on one side (or both), so we can swap eeprom chips as you make new sounds available. I'm certain I'm not the only person who sockets their eeprom chips here ?