Newbie Looking to Drive (real!) Pipes
Hey everyone! First post here.
I have a III/20 (3 manual, 20 rank) pipe organ that I have been building in my home over the past couple years.
organ "chamber"
My plan is to have three 64 note drivers for each of the three 61 note manuals, a 32 note driver for the pedal, and possibly a driver for the 59 stops (including couplers). Ideally, I would like to have the drawknobs and coupler tabs move, so I would need two 64 note drivers; one for the "on" solenoids and one for the "off" so
Trevor,
On the ULN2803, the com pin connects to the positive 12 vdc supply and the driver in the chip connects the load connected to the output pin to ground. The common of all of your magnets is connected to 12vdc rather then ground.
On the UDN 2981, the common or ground pin connects to ground and the 12vdc supply connects to VS on the chip. In this case, the UDN is switching DC positive voltage to the high side of the magnets. One side of all of the magnets are connected together and to