Alternative PCB for Pythagoras circuit at PCBWay.com

[Paul.Ruby]

I screwed up the thread title. Meant to say "... at PCBWay.com"

In order to embed reverb into a combo pedal, I've made a PCB in small format. My intent is to install an always-on reverb into a combo pedal and use trim pots to "set it and forget it." Here's one with alpha pots used for testing. It's almost identical to the Pythagoras with some minor exceptions. The LED is hooked to the clipping indicator from the FV-1. The output capacitor is increased to 2.2uf as I was getting some low end loss. I used SMD chips since I had to solder the FV-1 anyway. Easy to do on a hot plate with some solder paste on the pads.


Eeprom and jumpers on the back for easy access. (I know the flux needs some clean up.)

Interactive BOM:

Interactive BOM for KiCAD

PCBWay link to the project (might not be live yet). I have a few left if anyone wants a PCB in the US. I will likely only use 5 of the 10 ordered. There is a BOM at this link as well with mouser links to all the parts. The links to POTs point to 12-turn trimmer pots that will fit but the footprint is for alpha 9mm vertical pots.

Spin FV-1 Embedded Project Board - Share Project - PCBWay

This is a smaller version of the Pythagoras from PedalPCB.com for creating Reverb, Delay, Flange or Chorus effects. The intent is to make it as small as possible for embedding into a combo-pedal forma...

www.pcbway.com

 

[Paul.Ruby]

Built one of these into a stand-alone, always-on reverb in a tiny case for my current pedal board. Also shown... My power amp with XLR out on the left and the all-in-one combo pedal on the right.

 

[Paul.Ruby]

FYI... The board is 2.5x1.75". I squeezed the one above into a 1590G but it was very tight on the sides to fit the jacks and I had to cut a hole in the base plate for the jumpers and eeprom to stick through a bit (but it gives me access to them easily). This case is only 1" tall. If you leave out the eeprom and jumpers to just pick an internal program then it fits fine in the 1" height. The 1590G2 is 1.3" tall, which would be better and it's probably the smallest case that can be used for a stand-alone unit with the jumpers and eeprom on the back.

Of course, the real purpose of this is as one module in a larger combo pedal case like I've done here:

Combo build for pedal board core: Pre-boost, Clean/drive channel, cabsim, noise-gate, post boost.

I've spent an inordinate amount of time creating a combo build with 3 footswitches in a 1590DD case. The picture tells most of the story. I'm happy to share info about it if anyone is interested... I'm wondering if anyone else has any interest in such a thing.... To make this all fit, I had to...

forum.pedalpcb.com

 

[Paul.Ruby]

Had to make some tweaks to mine for signal levels. The clipping LED was on all the time, so signal was too hot into the FV-1. And then the signal out of the FV1 was hot and hard to only add a small amount of reverb. These changes might be needed for others. First get input signal adjusted to avoid hard clipping. Then further reduce output signal if it's still too hot to mix into the output signal.