PNP Transistor Array : Why does it not exist?

[evandude]

***deleted***

 

[panic mode]

i think you are complicating too much. if all you need is just to drive
few LEDs from 12V source and original outputs are not strong enough
for that, just add two CMOS chips (hex buffers or inverters).
two HEX4049 chips, 10 LEDs and one 10x 470Ohm resistor array is
all you need. If you get LEDs in array as well total number of
components is 4 and price for whole thing is ca. $1-2.

 

[Roff]

i think you are complicating too much. if all you need is just to drive
few LEDs from 12V source and original outputs are not strong enough
for that, just add two CMOS chips (hex buffers or inverters).
two HEX4049 chips, 10 LEDs and one 10x 470Ohm resistor array is
all you need. If you get LEDs in array as well total number of
components is 4 and price for whole thing is ca. $1-2.

And you need to return your LEDs to +12v instead of GND.

 

[panic mode]

Thanx Ron,

That's correct (I did mention inverters...).
Should go to GND if using buffers.

 

[Roff]

Thanx Ron,

That's correct (I did mention inverters...).
Should go to GND if using buffers.

The problem with most (all?) CMOS buffers and inverters is that their source current capability is quite a bit less than their sink capability. Driving 25ma to GND may not be possible.

 

[panic mode]

I guess I'll have to avoid short posts meant to give ideas and
only provide complete solution or Ron will come after me...

8)

 

[Roff]

I guess I'll have to avoid short posts meant to give ideas and
only provide complete solution or Ron will come after me...

8)

Hey, I'm not pickin' on you. I just don't want guys (or gals) to get led down the garden path due to incomplete info.