Speaking of MAX7221/7219- has anyone had success using them to drive higher voltage/current lamps? They have an application note on it here: Mixed-signal and digital signal processing ICs | Analog Devices
I tried it last year and wasn't able to get it to work. I had some helpful correspondence with a Maxim engineer and some other folks but I may not have been using the the right mosfet for the circuit. (read: out of my depth).
--Roy
Hi!
Don´t know if this can help you but I think this person had the same problem as you:
Take a look at http://campingsex.org/ click on the top of the side on "8x8" and then on "3d rendering of 8×8". there you can see his project.
And this image http://campingsex.org/8x8/media/lamp_schematic.gif shows the schematic. there are also many information on the side, so perhaps you should take a look.
Poldi
Thanks so much for this! I wouldn't have found it. Trying to make sense of the schematic now.
--Roy
