Electronics > Projects, Designs, and Technical Stuff
Zener for voltage limit
<< < (3/4) > >>
beanflying:
These are a good option. 3 & 5 V nominal, charger and BMS cutout in a battery holder for Arduino/Wemos etc  https://www.aliexpress.com/item/ESP32-ESP32S-For-Wemos-For-Raspberry-Pi-18650-Battery-Charge-Shield-Board-V3-Micro-USB-Port/32843629344.html Plenty of other sellers too.

panoss:
This is good! But it doesn't have a 3.3V output, it has 3V!
Ok, my ICs work with 3V but I don't know if Lora 's range (crucial for the project) is reduced due to lower voltage.
beanflying:
When it doubt consult the oracle  ;) Andreas's channel is well worth a very careful look at if you want to play with Lora in particular. It is his fault I brought 6 of them to have in the stash.

guimtl:
I'm curious if the buck/boost will not create noise that could potentially harm the lora operation.
I think either great Scott or the guy with the Swiss accent mentioned it in one of their video.
beanflying:
I don't have anything in particular to test one of these on but loaded one up to have a look at the Regulator Noise. First screen capture is simply probe as shown in the photo with the DUT producing 5V @ 500mA

Approximately 500mA on the 5V rail for testing and a 300mA load (10 ohm Resistor) on the 3V rail with the 5V unloaded for the other. Looks like the 5V Boost is a bit more rough than the 3V. Easy fix to drop the noise is if you are running Lora or other noise more noise sensitive gear and only need 3V then cut the power to the 5V Boost.

Little to no science was used in these tests and no bandwidth filtering was used on the scope. For really low noise apps then Linear all the way for charging and regulation but for a simple solution these work great.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod