StripLed Blu PWM

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salve tutti ragazzi,
per prima cosa mi complimento del fantastico forum da voi supportato.
passo subito alla mia domanda.
ho realizzato un circuito che "dovrebbe"(ndr) :smiley-red: controllare in pwm una strip led da 12v.
la lunghezza della stripled รจ di 2m.
ho abbozzato questo skematico:

n.b. non prendete in considerazione il sensore pir  ]:)
fin qui tutto bene... quando ho realizzato il circuito vero e proprio ho notato che il transistor npn(tip120) (datasheet: http://www.datasheetcatalog.com/datasheets_pdf/t/i/p/1/tip120.shtml) si scalda parecchio e led rimangono accesi anche quando non vado ad "eccitare" la base con la 5v.

tengo precisare che la mia alimentazione esterna fornisce 12v e 3.33a
ragazzi vi prego aiutatemi... necessito urgentemente di risolvere questo problema...
vi ringrazio ancora

ragazzi nessuno mi sa aiutare perfavore?  =(


Arduino Forum > International > Italiano > Generale (Moderator: leo72) > StripLed Blu PWM


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