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by cnicht
Sat Feb 27, 2021 12:34 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

It looks like the resist but not the copper track is damaged.

Check for shorted tracks nevertheless.
by cnicht
Fri Feb 26, 2021 2:25 pm
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54577

Re: performer (or is it per|former?) sequencer build

Photos might be the next step
by cnicht
Fri Feb 26, 2021 2:24 pm
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54577

Re: performer (or is it per|former?) sequencer build

Photos might be the next step
by cnicht
Fri Feb 26, 2021 10:14 am
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54577

Re: performer (or is it per|former?) sequencer build

It depends on the control signals applied to it
by cnicht
Fri Feb 26, 2021 7:17 am
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54577

Re: performer (or is it per|former?) sequencer build

The display has 5 signal connections to the microcontroller.

I’d check the integrity of these.
by cnicht
Thu Feb 25, 2021 2:22 am
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Hi guys, I built this and when I plugged it in the screen lit up, but resistor R60 started smoking. I suspected a short between 3.3v and ground somewhere, but checking continuity several times at every possible place this could happen, I didn’t see any. I then decided to just turn it on for a few s...
by cnicht
Thu Feb 25, 2021 2:21 am
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Are the components around the op amp driving this output the correct value? Good call considering my last problem. Haha I'll check that first when I get home from work. Update: Decided to triple check my solder joints and found that I completely missed a few pins on U3 and U4. Everything is all cal...
by cnicht
Wed Feb 24, 2021 11:03 am
Forum: Music Tech DIY
Topic: Haible Trapezoid - Works too well!
Replies: 0
Views: 101

Haible Trapezoid - Works too well!

I’ve built a stripboard version of the Haible Trapezoid generator and it constantly cycles irrespective of the setting of the ‘OFF’ pot. The controls all work and the manual trigger functions if the cycle is in an off phase to trigger the output waveform. I’ve tried changing some of the bias resisto...
by cnicht
Mon Feb 22, 2021 1:05 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Are the components around the op amp driving this output the correct value?
by cnicht
Sun Feb 21, 2021 7:01 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Excellent
by cnicht
Sun Feb 21, 2021 6:20 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Is R60 ok?

Check it’s soldered correctly and is the correct value.
by cnicht
Sun Feb 21, 2021 6:00 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Looks good.

What are the voltages on IC6 wrt GND?
by cnicht
Sun Feb 21, 2021 5:40 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Use middle pins of JP1 as GND reference.
by cnicht
Sun Feb 21, 2021 5:22 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

With respect to - connect common of DVM to GND and probe voltages with the other lead.
by cnicht
Sun Feb 21, 2021 5:05 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Measure wrt GND
by cnicht
Sun Feb 21, 2021 4:38 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

What voltages are you getting on the pins of D7?
by cnicht
Sun Feb 21, 2021 4:04 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Is anything getting hot?

Also do you have D7 soldered the correct way round?
by cnicht
Sun Feb 21, 2021 4:01 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Is anything getting hot?
by cnicht
Sun Feb 21, 2021 5:11 am
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

Check the voltage rails, especially the 5V supply
by cnicht
Thu Feb 18, 2021 7:27 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3736
Views: 243301

Re: DIY Mutable Unsuccessful Builds

Do all the potentiometers and inputs work correctly?

Are the op amps, which condition the input signals, producing the correct range of voltages?
by cnicht
Tue Feb 16, 2021 6:56 am
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 411
Views: 51122

Re: uO_c 8hp ornament and crime.

I’m not connected to this company in any way but I’ve always had good service/products from https://www.buydisplay.com/
by cnicht
Mon Feb 15, 2021 4:33 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3736
Views: 243301

Re: DIY Mutable Unsuccessful Builds

Are the files you’re programming it with too large to fit in the flash memory?

I had a few issues with this.

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