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schmidt trigger

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trigger

New Member
can someone please tell me if you use a schmidt trigger sn74ls14 with a 6v input through a 1n4005 diode , will the max output be 5v. I am hooking it up to a sst89c54 microcontoller chip and don't want to blow the port. The signal is coming off a speedometer. Any help with the calculations to find the speed to display on an lcd will be appreciated
 

kinjalgp

Active Member
You can use opto-coupler for added safety or simply use the circuit attached below. The zener will protect your port even if input voltage is greater than 6V.
 

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Sebi

Active Member
In this case You can omit the serial diode, because the zener also protected against reverse voltage.
 
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