12v common cathode LED strip help

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i trying control strip of leds run @ 12v share ground.

at use have 3 tip42 pnp transistors. , 2 darlington driver 8-channel uln2803 dip, far transistors go.

i thought away using pnp's work leds it's not working. can recommend schametic work? arduino have have same ground led or can power leds 12v source , arduino usb or other power source?

you can use separate power supplies, gnds need shared. on tip42:

+12v -> e pin on tip42
arduino pin -> 270ohm ->base pin
c pin on tip42 -> load(the +12v pin on led strip) ->gnd


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