Search found 8 matches

by aseaman
Mon Sep 14, 2020 8:44 am
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 164
Views: 7243

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

:doh: You're right, the caps for the OPL board were backwards. I flipped those but still no output. There's only one electrolytic cap on the main board and I verified that is oriented correctly (negative side facing the blue pill).
by aseaman
Sun Sep 13, 2020 10:16 am
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 164
Views: 7243

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

So I finished building this the other day however there is no output from either the audio jack or the clock output. The LEDs and the screen light up, I can use the various switches to navigate through the different modes, edit the different channels, change the BPM, etc. but no output. I verified t...
by aseaman
Sun Mar 22, 2020 11:31 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

The measurements were all DC and I just recently got a scope however I'm still learning the ins and outs of it.
by aseaman
Sat Mar 21, 2020 6:16 pm
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

I was finally able to loop back up on troubleshooting my Plaits module. Since last time, I inspected the various components around the DAC and noticed that the capacitors for C29 and C31 were actually oriented incorrectly -- they were vertical rather than horizontal. I've since placed them correctly...
by aseaman
Mon Feb 24, 2020 6:50 pm
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

I've been putting off getting a scope but this was all the convincing I needed -- it should be arriving on Wednesday. Until then, I'm not getting a negative voltage on pin 5, instead I'm getting 0.5v
by aseaman
Sun Feb 23, 2020 7:29 pm
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

That’s much too low - are you measuring with an oscilloscope? Post some photos of your board. These measurements were taken with a multimeter as I don't have access to an oscilloscope. When I measure the input into the DAC I get 3.3v -- I also get 3.3v on pin 8 which should be the the analog power ...
by aseaman
Sun Feb 23, 2020 12:53 pm
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

cnicht wrote:
Sun Feb 23, 2020 11:19 am
Are you getting signals out of the DAC?
I'm currently getting ~3.3mV out of pins 6 and 7 which according to the spec sheet should be the analog output.
by aseaman
Sun Feb 23, 2020 10:24 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3545
Views: 216370

Re: DIY Mutable Unsuccessful Builds

I'm building a Plaits module and am hoping someone can help shed some light on an issue I'm having. Flashing the firmware was successful as I can toggle the various modes as well as adjust the internal LPG and frequency range. The issue I'm having though is there is no audio out of the output jack. ...

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