1. D

    3.3V Microcontroller pin protection circuit.

    Hey all! :) I was looking for a solution to protect the analog pins of the ESP32 microcontroller. My circuit can produce voltages up to 5V and the analog pins of the ESP32 can only withstand 3.3V max. I found a solution online (picture attached) but I don't understand how the circuit works. I...
  2. K

    Trouble with overheating LDOs

    I am designing a custom pcb with a 3.3V and 5V LDO power regulator that converts 24V DC input to 3.3 and 5V to power a microcontroler , ethernet modbus transcievers, and some sensors. The whole system drawns maximum 200mA of current during operation 5V LDO = L78M05ABDT-TR 3.3V LDO=...
  3. E

    Voltage regulator for battery powered microcontroller

    Hi folks, I think what I have is a fairly simple question, yet I've spent so much time Googling, that I've completely lost track of what is what. I'm looking for an affordable voltage regulator to power an ESP32 from a number of AA or AAA batteries. I have bought a pair of these (Dutch...
  4. Randomaker

    Does the CD4051 Analog Multiplexer work with 3.3v?

    I need an analog multiplexer that I can use with a 3.3v NodeMCU. Someone suggested the CD4051. I am just checking to make sure this works with 3.3v? Thanks!