Ah ha (great band)! Zener diodes! That was the only component in my kit I was unfamiliar with (aside from the various ICs), very cool tech.
Another question:I have 5v and 9v vrms, and obviously I need 3.3v; given that a vrm guarantees a fixed voltage regardless of current draw, can I use a downstream resistor to step the voltage down to 3.3v? Or is that also gonna cause problems?
Lol. My bench is usually a lot tidier than this, but I have a couple projects on the go, and no where to put them.
So, what’s the special sauce in a vrm that allows it to compensate like that? How does it “know” what the target voltage is? Do you need a reference voltage? I still haven’t read the docs
Yes I have vrms. I used the resistor because I was super excited to see if the stuff worked, so I haven’t read the docs for them yet.
My current set up is an old Motorola phone charger soldered (poorly, but I don’t leave it plugged in) onto DuPont connectors which provides about 5.3v to the power bus on the bread board. I don’t plan on subjecting my esp32s to this set up until I have a little more practice with power delivery. While the esp32s are cheap, there not that cheap.
Yep, I already ran into this stepping down the 5.3v to ~3v.
I knew that they’d likely be a little rough, but they were cheap and available ($80), so i decided that I could make whatever showed up at my door work. I’m just happy that I haven’t found any DOA components yet
Thanks for the detailed advice on manual trimming, that’s great to have as a reference!
Kit also includes trim pots!
Oh, right. Brainfart. Thank you.
Man. These have all been very detail answers. thank you so much for your time and knowledge. Very helpful. I think I’ll try to build a vrm (for fun, not for my esp32) with this info.