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| jarrin > Interests > Electronics > Motorized Armchair | |
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Smokin! 4/20/2006 10:55 AM
So then I decided (without bothering to do a unit test on the low-side NPN transistors) to breadboard an entire H-Bridge circuit (without the microcontroller) to see if I could get the motor to turn by supply the appropriate logic levels to the corresponding pins. Unfortuantely, when I turned on the power the motor didn't spin and some of the little magic smoke escaped. After a minor set-back like this I like to slow down, write up my findings and re-think things. My next tasks will be: disassemble the circuit, test all the components & replace the metled ones, unit test the NPN transistors (I'm trying to get away without a two-stage transistor on the low side of the bridge but this might be a bad idea, this unit test should let me know), re-build the circuit more carefully and try it again (with the multimeter in place of the motor). I think I'm going to have to place another Jameco order pretty soon. Why did I only buy 8 TIP transistors? They're only $.50. I should have bought 80! |
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