Messages

Am I missing something?  i see no schematic or layout

How is the mix working out for you.  I haven't done the octagon but have don the DMD-2.  I found that with the mix at 12:00, the dry signal was lower than unity gain.  The signal is stronger coming from the FV-1 than from the first op amp.  I used a 150k resistor across legs 1 and 2 of the mix control to allow more clean signal pass and leave the FV-1 signal untouched.  I found this much more balanced.  I may drop the 150k just a tad, more, but to me this was much improved on balancing the levels

Do you get unity gain somewhere roughly around noon though? It could be pot tolerance. I'm getting ready to build the Octagon so I'm curious.

my mix pot measured at 96.7k. Keep in mind my comment is around the DMD2 although the topologies are similar. I get unity on my dry at 10:00 which doesn’t allow for much effect signal as the FV-1 signal is at 70k resistance at this point. That may be fine for some obscure algorithms but for most time based effects, the clean signal should be unity throughout the sweep and mix shoul introduce or remove effect signal. I cannot speak to the octagon but looking at the schematic it likely suffers from the same design flaw. Probably a fun pedal but not ideal for  serious studio or gigging use. I have since redesigned the mix so that clean is unity throughout and effect level is mixed in.  I think a generic topology is used for these boards but not ideal for all algorithms without  treaking.  I did the hypernova Reverb as well a it is honestly a noise pedal. Clean is processed through the FV-1 instead of mixed. The second half of the IC is configured for 6db gain boost only to have to turn down the 100kb volume to get unity. This adds unnecessary non-linear noise. I redid it for unity gain which significantly removed unessasarry noise but the noise floor is still evident especially with clean guitar signal. It can easily hide behind the noise floor of a stomp box ahead of it but overall both builds have left me underwhelmed. I feel like a vanilla dev board type schematic was used for these with no effort to optimize for the given effects

How is the mix working out for you.  I haven't done the octagon but have don the DMD-2.  I found that with the mix at 12:00, the dry signal was lower than unity gain.  The signal is stronger coming from the FV-1 than from the first op amp.  I used a 150k resistor across legs 1 and 2 of the mix control to allow more clean signal pass and leave the FV-1 signal untouched.  I found this much more balanced.  I may drop the 150k just a tad, more, but to me this was much improved on balancing the levels

Update.     

I typically don't expect much from opamp rolling, but the owner of a local surplus store gave me a few JRC4565D chips. He didn't know the exact use for them but knew they were used in stereo receivers and CD players.  These were NOS 1990 code.  At first I tried this on some OD pedals but they are not unity gain stable. I then tried it in the moodring and DBD delay. To my surprise these Opamps seem to bring out the best in PT2399 chips.  The opamp specs seem to indicate that they are capable of being a driver but not catagorized as a driver opamp. They are capable of 20v peak to peak at 400ohms. They draw a bit more current as well. In IC4 of the moodring they make the PT2399 considerable more lush and present. So right now I have an OPA2134 in IC1 and a JRC4565D in IC4. Also since I am using the long Reverb the dwell is almost to much and oscillates to easily if the mood or space are set too low. I dropped 100k across pins 1 and 3 of the dwell to modify its range and taper. So far, really loving this pedal

Yes. It's the 2018 board

Stuck to the schematics about 95% with just a few value changes. I used the long Reverb module and Burr Brown OPA2134 opamps. They send to offer the quietest and richest operation.