johncouture
New Member
THE QUESTION:
Is there an inexpensive (<$2) DIP IC similar
to the ULN2803 that will allow me to SOURCE
15VDC on the top side, and switch that 15vdc
between four LED banks using a 5vdc pin from
a MCU?
PROBLEM:
I am trying to light up a 4" high, four digit,
7 segment common anode display using a
microcontroller (i.e. a PIC).
The BCEF segments have 5 LED's each
and the ADG segments have 4 LED's each.
Thus, they take more than the typical 5VDC.
SUCCESSFUL TEST:
I am currently successful with a ULN2803 for
the cathode segments but I have to use eight
transistors on the anode side to source the
15vdc to select the digits using a pin
from a MCU (max 5vdc, 20mA) pin.
What I am looking for is an IC that is an
array of transistors configured so that I
can SOURCE the 15vdc.
Schematic attached.
Is there an inexpensive (<$2) DIP IC similar
to the ULN2803 that will allow me to SOURCE
15VDC on the top side, and switch that 15vdc
between four LED banks using a 5vdc pin from
a MCU?
PROBLEM:
I am trying to light up a 4" high, four digit,
7 segment common anode display using a
microcontroller (i.e. a PIC).
The BCEF segments have 5 LED's each
and the ADG segments have 4 LED's each.
Thus, they take more than the typical 5VDC.
SUCCESSFUL TEST:
I am currently successful with a ULN2803 for
the cathode segments but I have to use eight
transistors on the anode side to source the
15vdc to select the digits using a pin
from a MCU (max 5vdc, 20mA) pin.
What I am looking for is an IC that is an
array of transistors configured so that I
can SOURCE the 15vdc.
Schematic attached.