dout w/darlingtons

Design Concepts
1

Does anyboy make a dout board that includes the darlingtons?

2

Hi,

Well, for interfacing DOUT with darlingtons, see MIDIO128 page: http://www.ucapps.de/midio128.html

There’s schematics example for connecting ULN2803 darlington array to DOUT.

Bye, Moebius

3

I have read that. What I want to know is if anyone is offering boards or kits for the darlington arrays or possibly a dout board that includes the darlington arrays on the same board.

4

Sorry.. - No boards or kits offered - I haven’t even seen a ready made pcb layout for that. Maybe someone working midification projects has done it.

But the circuit is pretty simple, so it’s easy top build on so called “veroboard” (board with holes in raster and copper strips)

Bye, Moebius

5

hi,

Thanks. I think the whole dout with the darlington array could be wire wrapped fairly easily. Just thought if there was a PC board available it would look neater.

Bill H

6

Hello again,

While on the subject of the dout module, I notice that there are 220 ohm resistors in series with each output. I assume they are there for current limiting and probably not necessary if the 74HC595’s are connected to the darlington arrays. Is this correct?

Thanks,

bill h

7

As in an example schematics on MIDIO128 page - the one you’ve already read - yes :wink:

Bye, Moebius