maxx11 Posted January 10, 2012 Report Share Posted January 10, 2012 I have a core and 2 DOUT modules to midify a band organ. When the core is powered up midi note 45 is always on ( LED shows 1|note C_2 Oo) With no midi input connected to the core the note is on, if I connect my midi file player and play a tune it will play all notes just fine BUT midi 45 will always be on. Any suggestions please? I'm stumped. Quote Link to comment Share on other sites More sharing options...
gomiboy99 Posted January 10, 2012 Report Share Posted January 10, 2012 I assume that the DOUT is connected to the organ so as to operate that key on the organ, in which case check the wiring. You could supply the DOUT with +5V and 0V without the core connected, this would help narrow down where the fault lies. Quote Link to comment Share on other sites More sharing options...
sparx Posted January 10, 2012 Report Share Posted January 10, 2012 What happens if you swap the 2 DOUT's around? Quote Link to comment Share on other sites More sharing options...
maxx11 Posted January 11, 2012 Author Report Share Posted January 11, 2012 looks like it might be a bad uln2803, new ones on order Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.