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Littelfuse or Coto Technology. You'll find them on Mouser, Digikey etc. I wouldn't trust any electronic component from Amazon or any other site that doesn't specify the manufacturer and part number, with a datasheet available. NC reeds are extremely uncommon. I think you'd be better off...

This switch style ought to be jerry-riggable into a self contained low profile reed switch contraption. A little PCB with a reed on it instead of the original body, some plunger with a magnet inside, reuse the X (or rather Y) clips for fastening, and behold! A new pedal part is born. I've been...

I wonder how this last one installs in a pedal. Looks like it needs a huge hole for the plastic piece, but allows LED lighting. Intriguing...

I bought mine from the link I posted above (Banzai Music in Germany). They're about 2 Euros a pop and shipping to Canada is around 9 Euros. I didn't find that expensive at all, but I did buy a couple dozen, so shipping became negligible.

Get an actuator as below, add a tiny magnet to the plunger, and put a NC reed switch underneath: https://www.banzaimusic.com/Switch-Actuator.html I posted a thread some time ago about making low profile footswitches, you might want to find it and take a look. EDIT: here's the old thread i was...

^ yup, quiescent current can be an issue. I found out the hard way that an LM7805 can easily draw 3mA by itself with no load, which is huge for battery-powered stuff. If you're really trying to save power, you probably want to consider a switching regulator, not linear. But switchers tend to...

For extra confusion, KiCad places pots by default with pin 3 down. Those... bastards!

Some voltage regulators are lower noise than others. It's one of the parameters to look for in the datasheet if the noise level is important. Zener are easy enough to denoise with a parallel elcap. In any case, if this is about a PT2399 circuit, I won't worry about it. The chip itself has lots...

A lower dropout won't make it any more efficient. It will just insure it can still put out the rated voltage when the input voltage is not much above that. Say, 6V at input and you want 5V out. A 7805 will struggle to maintain 5V in this case, but an LDO will be fine. When you go down from 9V to...

PT2399 max current draw is about 40mA. If there was no Zener and you have a 9V supply, you'd have to drop 4V across the series resistor to supply 5V to the PT2399. R=V/I, so R = 4/0.04, or 100 Ohms. I'd go a bit lower, maybe 82 ohms, to have a bit of a margin if the 9V supply dips a bit. Use a...

Cap right across the Zener. And make sure you correctly size the series resistor before the Zener.

A zener should work fine. Bypass it with a cap though, maybe 100uF or so, to get rid of the noise. Zeners are great white noise generators.

It's OK to use Vref as signal ground, even in a more complex circuit with multiple Vref nodes, if it's properly buffered by an op amp or dedicated rail splitter IC. In one of my most complex circuits I couldn't make up my mind if I should use Vref or the negative rail as ground for a group of 3...

Here are my favorite low power op amps for guitar stuff, from lowest noise to lowest power (and price): OPAx205 OPAx196 OPAx990 The last one works fine even at 3V or less (single CR2032).

Design the circuit for low current draw. There are good dual op amps amps drawing 0.2 to 0.3mA (as in, at least as good as TL072) but they're SMD-only.

11M? That's not even a cromulent value! Who the hack uses 11M? Booo!

Cool! The rest of the noise you're getting could probably be fixed by shielding your circuit. Try a sheet of aluminium foil under the breadboard (make sure you ground it). Maybe put a sheet of paper between them to avoid any shorts. I use this method a lot when I measure my circuits, so the...

Yeah, the parallel 100nF is more of a "good practice" than anything. Nothing beats a simple resistor followed by a chonky elcap.

Set your meter to mA DC and (somehow) insert it in series with the power supply. OR: If your pedal already has a series resistor (such as 100 ohm, or 22 ohm or whatever) right after the DC input jack, you can measure the voltage across this resistor (V) and compute the current using Ohm's...

A 100 ohm resistor followed by 100uF (or more) to ground (maybe in parallel with a 100nF, which works better at higher frequencies) would kill all but the most egregious noise coming from a power supply. Just as long as your pedal doesn't draw a lot of current, in which case the 100 Ohm resistor...