manage 12V pulse and 5V pulse on the same pin

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ep.hobbyiest

Joined Aug 26, 2014
167
I have Atmel controller which requires a 12V pulse and 5V pulse during flashing. I have a 12V supply and derived 5V from it using a regulator. But I want to know how can I give the 12V pulse and 5V pulse on the same pin.
We can manage to give pulse single voltage level using NPN transistor but how to pulse of 12V and 5V based on the conditions.
 
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