koolguy
Active Member
Hello Here,
I was using TIP 122 for Led sign, it was working as usual i.e. fine.
The emitter to gnd and base to pic micro controller via 4.7K TIP was npn no problem.
but now Tip 127 is pnp so, Emitter to +24V and collector to output so, base via 4.7K to pic out put for switching on/off as a switch.
when emitter is connected to +5V then the output is fine problem come when emitter is at 24V to collector remain at 24V not goes turn off why??
so, what to do?
I was using TIP 122 for Led sign, it was working as usual i.e. fine.
The emitter to gnd and base to pic micro controller via 4.7K TIP was npn no problem.
but now Tip 127 is pnp so, Emitter to +24V and collector to output so, base via 4.7K to pic out put for switching on/off as a switch.
when emitter is connected to +5V then the output is fine problem come when emitter is at 24V to collector remain at 24V not goes turn off why??
so, what to do?