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Avr drives PNP transistor

 
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amirf

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Joined: 25 Aug 2009
Posts: 154

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PostPosted: Fri Aug 10, 2012 11:08 am    Post subject: Avr drives PNP transistor Reply with quote
Hallo All ,
yes avr pin can drive npn transistor (like tip41) via 120 ohm resistor , but i am no luck driving pnp transistor (like TIP42C) using avr pin , any ideas how to drives PNP transistor using avr pin ?
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six1

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Joined: 27 Feb 2009
Posts: 553

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PostPosted: Fri Aug 10, 2012 1:01 pm    Post subject: Reply with quote
PNP -> R between Emitter and Basis (4K7) this is for getting high impedance between Collector Emitter

additional NPN Transistor. Emitter to Ground, Base with 1K to Port Pin and Collector with 2K2 to Basis PNP

those values are only for testing 5-12V ... you have to optimize them!




If you need more Power, you can google for "mosfet high side switch".


best, Michael
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amirf

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Joined: 25 Aug 2009
Posts: 154

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PostPosted: Sat Aug 11, 2012 2:49 am    Post subject: Reply with quote
Thanks Michael for Great Info
Best Regards
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