e-licktronic Forum

I have completed the yocto and am waiting for an atmega chip with the OS before I can call it 100% finished. I'm noticing a few odd things Id like to get everybody's opinion on.
edit: I'd also like to add that LED's 1-4 a very dim.
From what I understand when you power on with a blank atmega chip the the only thing that happens is all of the leds on the step buttons light up. I only have this happening sometimes. Sometimes none of the lights will turn on, other times half of them, sometimes all but 1 or maybe even all but 3. Is this and indication of an issue? If I've powered it on and off it quick succession I can almost guarantee no leds on the step buttons will light up. Only after I've left it unplugged for a few minutes will it give me the possibility of turning on with any of the step buttons lit.

The other thing I've noticed is when I am plugged into the output and flip the switches on the congas/toms, what ever I've just switched to triggers very quietly. I hear nothing with the hand clap. The most concerning thing is when I engage the rimshot switch I hear a loud popping/cracking sound. i can also hear what sounds like a hollow high pitched sound...almost like the tail end of a sound that has been affected with reverb when the volume is turned up.

any ideas or help is greatly appreciated

Check all the ics in the sequencer section to make sure they're all soldered properly and in the right direction. That's probably a good starting point.

*edit* Just saw your other post with the same advice.

Thanks for the tip. A good friend told me I should have socketed all the IC's and I brushed him off...big mistake...Really wish I would have done that. Lesson learned. I know it would increase the cost of the kit and isn't necessary to get the yocto to work but I think it would be a good idea to mention it in the build instructions for motivated but unexperienced diyers of projects of this scale(like me!). Dont' get me wrong, I find some sort of sadistic pleasure having to go through everything to find the fault(s). I learn a lot more about electronics then if it would have fired up instantly.

Is there a good way to test the sequencer Ic's to see if they are fried? I have gone back through and reflowed the solder on the Ic's and it still isn't working. It seems like something is resetting because after I have powered up using 1,3, and 5 to boot into sysex mode. If I press the step buttons again after a minute or two the steps lights will flash twice just like when i powered it on...I'm not sure if this is normal or something that points me into the direction of the problem?

Hurray! 75% of my issues have been sorted out. Ic4 wasn't completed seated against the circuit board. I desoldered it and added a socket and reseated the chip. Presto, when I went into sysex mode and dumped the firmware I saw flashing lights. Firmware has been burned! OHH is working properly and leds are all lit.I definitely need to tune some of the voices. The only thing that doesn't seem to be working is the clap.