0

No effect when pots turned, keyboard mode not working
Moderators: altitude, adafruit_support_bill, adafruit, hamburgers, phono

Please be positive and constructive with your questions and comments.

No effect when pots turned, keyboard mode not working

by Guest on Thu Jun 23, 2005 1:35 pm

Got it built but the decay and accent knobs have no effect at all, and yes I have put accents in the pattern! Pattern edit and playback seem fine but keyboard mode does not seem to work. Any ideas? :cry:
Guest
 

by Guest on Thu Jun 23, 2005 3:37 pm

Also I have just noticed there seems to be a problem with the vca not shutting completely as you can still hear the last note sounded in the background. I was very careful when building it (have built a whole modular before as well as tons of other stuff) and all the IC's are socketed, the transistors and diodes are all orientated correctly.

Any ideas?
Guest
 

by Guest on Thu Jun 23, 2005 6:24 pm

it sounds like the microcontroller is acting up
try reloading the firmware

also check that the accent is being told to go on and off
it sounds like accent might be stuck on
check ic12
1. put in keyboard play mode
2. turn accent off
3. check voltage on pin5 of ic12 it should be 0 volts
4. turn accent on
5. check voltage on pin5 of ic12 it should be 12volts

also if you post in the making x0x forum you might get more replies
Guest
 

by Guest on Fri Jun 24, 2005 2:26 pm

Hmm, I have all the IC's socketed, so I unplugged the 4066 (IC12) completely from the socket, then I powered it up and it still does exactly the same thing (ie works but with the original problems) so this would indicate a duff ic? What do you think?

I have checked the socket and it is fine, so duff IC or something else?

Thanks for the lead!
Guest
 

by Guest on Fri Jun 24, 2005 2:28 pm

Is there any pins on the socket I can probe with my meter to establish if the switches on the 4066 are being fired?
Guest
 

by Guest on Fri Jun 24, 2005 3:19 pm

if the decay knob still has no effect with ic12 removed
the ic is not the problem

how long is the filter decay currently

does the env mod pot work as it should
Guest
 

by Guest on Fri Jun 24, 2005 4:16 pm

filter decay is fully open, env mod seems inverted?
Guest
 

by Guest on Fri Jun 24, 2005 5:53 pm

you should check out the posts under the title
working sort of

your envelope generator could be bad
Guest
 

Please be positive and constructive with your questions and comments.