Strange behaviour...

[goyousalukis]

Hi, I have completed my mbseq project, but I am having trouble troubleshooting a problem. Here goes:

If I load the MBSeq, I get all kinds of pot jitter. All the LEDs and Switches work fine, and the sequencer runs and outputs midi fine, but the screen flickers with the changing pot values.

If I load the AIN test program, and all the pots are at 0, there is no pot jitter. If I turn any one pot to around 10, it will oscillate between two values i.e. 10 & 11. If I turn the same pot to a higher value like 100, it will stay steady. When I start turning multiple pots up, I get the pot jitter.

I have tested the voltage at the extreme pots, and they all come up at 5.02. I have also checked, rechecked and checked again all the solder joints.

Anyone have any ideas? Thanks for your help..

Justin

[goyousalukis]

Well, Like clockwork! 20 min after posting to the forum, I found the fault: one of the leads to a pot was shorted to the can of another pot.

Now I just have to figure out how to use the sequencer...