Bring out yer Diptrace
- Thread starter Grubb
- Start date
Silver Blues
Well-known member
So, if I'm understanding this correctly, one can press the footswitch a "normal" duration to toggle the first relay (e.g. a bypass), and then press and hold the switch to toggle the second relay (e.g. a channel switch), but then go right back to a short press to toggle the first relay?
szukalski
Well-known member
You can set it up as you want, short press for both channels, or short for pedal and long for hold, or any mix you want. But what you described is my default coding.
Silver Blues
Well-known member
szukalski
Well-known member
Sure thing, just need some down time to work on the code. Interested if there are particular use-cases you're looking at.
I might be in for a couple of these when they're available!
My initial thoughts are the following modes:
- Two independent channels with a footswitch each. Hold to temporarily change state whilst you keep the switch down.
- Two channels with one footswitch. Hold to turn on/off second channel. (Good for boost or voicing).
- Two channels with one footswitch. Hold to change channel.
- Two channels with one footswitch. Double tap to turn on/off second channel. Hold to temporarily change state.
Big Monk
Well-known member
The two ideas I’ve had are a Fuzz Face with switchable octave up and a Tone Bender MK I with a switchable fixed wah circuit.
Silver Blues
Well-known member
Yeah I'm sort of imagining a two channels with one footswitch kind of deal for a far-away project idea, and the more I think about it the more it might make sense to have short press to change channels and long press to bypass, that would be cool. No hurry at all, I'm just spitballing here!
finebyfine
Well-known member
quick little one for the sunn buzz pedal
finebyfine
Well-known member
bring out yer diptrace schematic edition - distort-o-matic 2 from boscorelli's stompbox cookbook
finebyfine
Well-known member
Does anyone have tips for laying out IC heavy designs? I feel so much more challenged by them than transistor based ones.
szukalski
Well-known member
I am by no means tenured, but I have found the following useful:
- Use dual opamps over quad. Just easier to place stuff.
- Place your non-movable components first (IO/pots).
- Follow the schematic and group components in logical modules before placing movable components. Treat the module as a single unit for placement, then optimise. For example, in your schematic above, C1/R1/C2 would be a module (In -> opamp), R2/R3/C3/C4 would be the next, C5/R4, D2/R6, D1/R5/C6.. and so on.
- I like to place my opamps PPCB style, tab high, so I place them (usually in the center so I get a nice channel in the middle for vertical traces) and then see which modules can go on which sides, and which need the center (because they span sides).
- Once I have a rough placement, then I decide whether components are better vertically or horizontally. I try to get traces going into ICs/transistors as short as possible. Vertical placement can be nice when there's a lot going in the feedback loop (like the Wise Sheep above).
- Then optimise for shortest traces and practicality (can't solder a pot when you can't get the iron to the pads because it's got e-caps all round it..
finebyfine
Well-known member
thank you so much @szukalski !! will hopefully have a nice layout to show off because of all of your advice 
szukalski
Well-known member
Happy to pay it forward. Only got into DipTrace because you shared your handy little pot template. Still use that on every build and can’t find a realistic improvement!thank you so much @szukalski !! will hopefully have a nice layout to show off because of all of your advice
finebyfine
Well-known member
If you think of anything please lemme know - the only thing I've changed on mine is making it bigger so that the corner standoffs are less likely to bump into pots.
Also here's a rough attempt of the schem I posted! Not super satisfying of a layout but might reach the threshold of tolerable enough to get fabbed
szukalski
Well-known member
I like the diode footprint
Nice layout, only things I could mention:
- The 1u film cap footprint is only 2.5mm, maybe want 4.5mm unless you have tiny 1u caps.
- You could look at moving the charge pump into it's own corner. I didn't mention it earlier, but I "try" to keep all the power supply stuff isolated from the rest of the circuit where possible. That goes double for charge pumps.
finebyfine
Well-known member
I like the diode footprint
Nice layout, only things I could mention:
- The 1u film cap footprint is only 2.5mm, maybe want 4.5mm unless you have tiny 1u caps.
- You could look at moving the charge pump into it's own corner. I didn't mention it earlier, but I "try" to keep all the power supply stuff isolated from the rest of the circuit where possible. That goes double for charge pumps.
Thank you! Good idea about the charge pump and good catch on the film cap, wish I had caught it before I sent it off! Guess I'm using MLCC or gonna make a film cap look like its on stilts!
szukalski
Well-known member
I love how the footswitch fits. Would you be willing to share the DipTrace component/footprint? I prefer the "other" way, but that's just damn hot.
By the way, if the price of the relay is painful (I see them around €2.50-€3 each and end of life), then the FTR-B3CA4.5Z is $0.71 from LCSC. Different footprint though.. but profit margins..
Big Monk
Well-known member
Yup. I’ll share the switch footprint and dimensions for the board cutout sometime tonight when I’m home.
I’ll look up that relay as well.
