Ah, I think I've found why one of my boards isn't presenting a USB device on boot. This sits between the USB connector and the RP2350...
I don't have anything fine enough to try to fix that by hand, which is a shame.
Anyway registered a quality issue, so will see what happens.
When you knock over an open bottle of superglue, catching it in your hands to save the workshop floor is about as, if not more, stupid than catching a hot soldering iron!
DAMHIKT
Acetone worked to unglue my wedding ring though, but the rest of my hands are really 'crusty' now.
@diyelectromusic @quixoticgeek
#MakerFail was a little more active back in the Twitter days.
It could do with a revival.
@mike @MakersHour @[email protected] I think we learn as much from each others #MakerFail s as we do from the successes!
It's good that you've written it up :)
Damn, for a brief hour or two this evening, I thought I'd made a breakthrough with the DX100.
But it turns out I get a really neat and crips data signal when I plug in a blank ROM by mistake :)
Still I think I've ruled out the ROM, RAM, sound generator, and probably the ADC...
So that really is pointing back to the display I think...
I've written up the latest minor increment forward here.
But fundamentally it still isn't working :)
https://diyelectromusic.com/2025/07/08/diagnosing-and-attempting-to-fix-a-yamaha-dx100-part-4/
I've just tried to program a new ROM for my DX100 to rule that out and as far as I can see that has had no effect.
I've updated my last post on the topic anyway, but I might have to admit defeat with this one as I'm not sure I've got it in me to be desoldering RAM chips or the Yamaha sound generator...
I'm still wondering if there is a simpler explanation I'm just not seeing at the moment.
https://diyelectromusic.com/2025/04/16/diagnosing-and-attempting-to-fix-a-yamaha-dx100-part-3/
And immediately followed by a simpler version, thanks to the observation by @bytex64 that the originals wouldn't have used ADCs at all! :)
https://diyelectromusic.com/2025/06/22/atari-2600-controller-shield-pcb-revisited-part-3/
Just goes to show that sometimes we can't "see the wood for the trees" in some of these things! And we are spoiled by our modern tools.
Was this a #MakerFail ? Not sure. Certainly some learning going on there though :)
Haha. Whilst messing around with this for its proper purpose this morning, I've realised I've used values in the PWM filter much more suited to audio frequencies than a CV!
That will teach me to properly think about my requirement for a circuit rather than paste in a previous one :)
diyelectromusic
Alfred Chow - Maker of Things
MakersHourQuestions
