Keyboard Mode // ENV triggering problem // LOW C

Discuss x0x construction and related issues

Moderators: altitude, adafruit_support_bill, adafruit, phono, hamburgers

Please be positive and constructive with your questions and comments.
Locked
sequentialmood
 
Posts: 29
Joined: Tue Apr 23, 2013 5:52 pm

Keyboard Mode // ENV triggering problem // LOW C

Post by sequentialmood »

Hi guys,
i've just succeed in outputting sound from my xoxbox, but the keyboard mode seems to behave strangely:

- when i press a key on the keyboard, a note is triggered with its own pitch and envelope.
each new pressed key triggers its own envelope except for the Low C key...

in this case an envelope is triggered once, and if i press other keys then, the env is not retrigged.
I've to wait few secondes for the C low note to finish to be enable to retrigg an env again.

Help is appreciate! thanks! :)

User avatar
mmm
 
Posts: 517
Joined: Tue Apr 24, 2012 1:51 am

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by mmm »

Please measure the voltage on IC18 pin 3 when pressing and releasing "low C"; do the same for pin 4 for "D".

sequentialmood
 
Posts: 29
Joined: Tue Apr 23, 2013 5:52 pm

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by sequentialmood »

Hi,

on IC18:
4.95 V on pin 3, when "low C" pressed.
same on pin 4, when a D is pressed.

thanks!

User avatar
mmm
 
Posts: 517
Joined: Tue Apr 24, 2012 1:51 am

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by mmm »

Does the voltage fall back to 0V upon release of the note button? This would be normal behaviour and indicate that IC18 is faulty.

sequentialmood
 
Posts: 29
Joined: Tue Apr 23, 2013 5:52 pm

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by sequentialmood »

on release, voltage is dropping from 4,95V to 0V on pin 3 of IC 18.

User avatar
mmm
 
Posts: 517
Joined: Tue Apr 24, 2012 1:51 am

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by mmm »

This means that most likely IC18 is faulty. I've seen this particular fault (for IC16 to IC18) several times in the past.

sequentialmood
 
Posts: 29
Joined: Tue Apr 23, 2013 5:52 pm

Re: Keyboard Mode // ENV triggering problem // LOW C

Post by sequentialmood »

I've changed IC 16 to IC 18, now i've a got normal envelope on the C note.

Thanks again MMM! :)

Now, let's create a new post: MIDI IN / MIDI OUT and USB stuff seems not to work.. :/

Locked
Please be positive and constructive with your questions and comments.

Return to “Making x0x”