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Any suggestion to interface 5V to 3.3V signal

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5 v to 3.3 converter

For data or signal application, I would suggest using a transistor or optocoupler to do the converter switching.
**broken link removed**

For power supply conversion application, I would recommend
LM2575-adj, LM2576-adj, LM2575-3.3, LM2576-3.3
**broken link removed**

from:
Siong Boon
 

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