Thanks for all the reply's!
the shift register L9822E looks interesting but as far as I understand
it needs a serial input which is a bit too hard for me, specially with PWM, I think.
Thanks for the pnp npn story, I understand that much better now.
The 2N7000 looks very good, specially the dual-in-line version.
But I think what might be slightly better is the ULN2803
. An advice of
a Dutch guy.. He also advised me a 100nF capacitor between the power and the ic's.
Tomorrow I want to update my circuit with this new information, I'll post it when I'm done!
The reason I want to use the tlc5940
is that I indeed want
to use PWM. We want to make the organ a bit special and
we think the sound is interesting you get when opening
air holes very slowly...
The reason I want to make a PCB
is that I made one circuit on a
strip board before and I used 2 tlc's (only the half of the second)
to control lego motors. I soldered first to use 2 lego motors and
it worked great, then I soldered the rest I completely got lost in
an enormous amount of wires ( I also needed to use resistors,
a lot of diodes, L298ne's etc). It ended up in a big Italian meal with
solder sauce were nothing worked anymore. (I finished the project
by start all over again and make it work for only 4 motors, without
tlc's...) I expect this project to have at least the same amount of
wires....I really don't
want this wire nightmare again