2 diode clipper

Thread Starter

minh

Joined Nov 24, 2010
41
Dear all...
Assuming item in is working(please see photo thanks), please help me to know :
voltage and image at port 2 of chip tc4420 and 2 diode use for what??
Thank you in advance
minh
 

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crutschow

Joined Mar 14, 2008
34,455
The voltage at port 2 equals the input voltage until the voltage peaks near ground and/or +12V at which point the diodes start to clip and limit the peaks to about 0.7V below ground and 0.7V above +12V (12.7V). The diodes are to protect the input from over-voltage.
 

#12

Joined Nov 30, 2010
18,224
Yes, it's that simple. They are just protection diodes that don't do anything unless you try to apply too much voltage that would harm the chip.
 
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