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DCC / Model Railroad

Started by ChrZeb, Dec 07 2012 04:44 PM

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#21 Clunis

Clunis

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Posted 20 July 2014 - 10:52 AM

Hi, I'm trying to use a TIP122 for my cause, but i have some trouble... Or I don't understood something.
I connected my pwm output to the B through 2.2k resistor, E to gnd and C to +VCC (5V) through RL resistor (1kOhm).
I have a 0.5V loss Vpp, but my logical signal 0 is -1.92V and 1 2.56V. why i'm getting negative voltages?
Thanks
_________________________
 
My fault, my probe was on AC Coupling -.-' Sorry guys... I need some practice with my oscilloscope...  :P

Edited by Clunis, 20 July 2014 - 02:36 PM.

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