digital logic - Is it possible to use a simple diode and pullup resistor to level shift down in one direction? - Electrical Engineering Stack Exchange
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Schottky Diode Bi-Directional Logic Level Conversion
5V to 3.3V logic level translation/conversion/shifting: how to interface a 5V output to a 3.3V input. – next-hack.com
level shifting - 5v clock feeding 3.3v microcontroller - resistor+zener acceptable? - Electrical Engineering Stack Exchange
IO Level Conversion 3.3V to 5V for ESP8266 | Circuits4you.com
Taking It To Another Level: Making 3.3V Speak With 5V | Hackaday
Making 3.3V, 5V Voltage Regulator Circuit with Diodes and Transistors | Homemade Circuit Projects
5V to 3.3V logic level translation/conversion/shifting: how to interface a 5V output to a 3.3V input. – next-hack.com
5v And 3.3v Level Signal Conversion Problems And Methods
Amazon.in: zener diode 3v 5v 6v 9v 12v
Taking It To Another Level: Making 3.3V Speak With 5V | Hackaday
XBee Level Shifting – Rob Faludi
How to interface a 3.3V output to a 5V input. – next-hack.com
Trying to understand this diode-based level shifter : r/AskElectronics
5V to 3V Regulator Using Diode - YouTube
Taking It To Another Level: Making 3.3V Speak With 5V | Hackaday
Level shifting 5V to 3.3V - can I just use a zener diode? - Electrical Engineering Stack Exchange
5v to 3.3v Converter Circuit and Module - Detail Schematics - SM Tech
Zener diode as voltage regulator - Electrical Engineering Stack Exchange
Designing a Simple Over-Voltage Protection Circuit using Zener Diodes
5V系・3.3V系信号レベル変換
