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 Forum index » Wanted, For Sale, Opportunities and Requests » Opportunities Wanted and Available
WANTED (paid): PCB debug help near Boston/Providence
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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Tue Dec 30, 2014 7:13 am    Post subject: WANTED (paid): PCB debug help near Boston/Providence Reply with quote  Mark this post and the followings unread

I am armed with a scope, a schematic and a HackMe Rockit synth that I've built. Most of it seems to work (the right lights blink when various buttons are pushed) but no sound.

I will happily pay for someone experienced to walk me through how to debug a project like this, I've hit a wall. I can come to you within a couple of hours of Providence, and I won't try to lowball your wait.

Hit me up!

loyd

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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Sun Jan 04, 2015 8:52 am    Post subject: Reply with quote  Mark this post and the followings unread

It has proven amazingly difficult to find someone near here. Bump. Sad
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elmegil



Joined: Mar 20, 2012
Posts: 2040
Location: Chicago
Audio files: 16

PostPosted: Sun Jan 04, 2015 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

It will probably continue to be so, but some of us might be able to help you remotely, for free even Smile.

Get the obvious questions out of the way first:

have you tried with the filter and vca all the way open?

If so, and still no sound, then you need to look for a signal; start at the output and work your way back in the audio chain -- which appears to be pretty simple based on this schematic:

http://hackmeopen.com/wp-content/uploads/2011/05/Rockit-Schematic.png

I would look for some signal with the scope on pin 18 of the atmega (be careful not to short pins together). If you have a signal there, then look to see if you're getting a CV output from pin 19 (will be a PWM signal, as you adjust the output volume you should see the duty cycle change).
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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Sun Jan 11, 2015 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Belated thanks for the offer, I've found a local EE that I'm working with who has gotten intrigued by the circuit. I'll update when I know more.
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elmegil



Joined: Mar 20, 2012
Posts: 2040
Location: Chicago
Audio files: 16

PostPosted: Sun Jan 11, 2015 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Excellent! Best of luck to you both.
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Shock_Hazard



Joined: Jul 17, 2015
Posts: 16
Location: Gwynedd

PostPosted: Fri Jul 17, 2015 5:35 am    Post subject: Reply with quote  Mark this post and the followings unread

If you still need any help with this, give me a call, or email or message or whatever Smile I'm only available through emails though as we're not on the same continent, but I'm an experienced synth engineer looking for work.
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