Peter, Looks OK to me (P channel fets excepted). You might want to add some sort or current limit protection in case something gets "stuck". - Series resistor with a capacitor bypassing it? Or just current limit the power supply? RP 2008/5/26 Peter Todd : > On Sun, May 25, 2008 at 07:39:57PM -0400, Peter Todd wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Just a sanity check before I spend a bunch of time building this... >> >> Attached is a circuit diagram I did up for a grid of bipolar >> electromagnetic indicators, also known as dot-flip displays, that I want >> to build. The attached grid is a 3x3, but what I will actually build >> will be 56*13 >> >> Electrically speaking you apply a roughly 12V pulse of a few ms in >> either direction. This magnetises two bits of ferrite which hold the >> colored dot in either orientation, yellow side up, or black side up. >> >> I just want to make sure my multiplexing scheme will actually work, and >> is the simplest possible solution, never done multiplexing before with >> anything other than leds. Of course, the high-side FETs will have to be >> PMOS, but other than that I can't think of any gotchas. > > The attachment... > > Also FWIW this is the project: > > http://petertodd.org/art/entropy-oscillator/ > > -- > http://petertodd.org 'peter'[:-1]@petertodd.org > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist