uO_c 8hp ornament and crime.

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Altitude909
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Re: uO_c 8hp ornament and crime.

Post by Altitude909 » Tue Jun 16, 2020 4:12 pm

half of U10 doesnt appear soldered and the top of U4 looks suspect

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Bartimaeus
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Re: uO_c 8hp ornament and crime.

Post by Bartimaeus » Tue Jun 23, 2020 12:10 pm

anyone in the usa got a spare pcb/panel set?

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emmaker
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Re: uO_c 8hp ornament and crime.

Post by emmaker » Tue Jun 23, 2020 4:49 pm

Bartimaeus wrote:
Tue Jun 23, 2020 12:10 pm
anyone in the usa got a spare pcb/panel set?
https://synthcube.com/cart/index.php?ro ... ption=true

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Faye
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Re: uO_c 8hp ornament and crime.

Post by Faye » Thu Jun 25, 2020 4:31 pm

Quick question regarding the version 1.1 PCB: In the diptrace file the capacitors C22, C25, C26 and C27 are 330pF, while in the BOM they are 560pF.
Which is correct?

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emmaker
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Re: uO_c 8hp ornament and crime.

Post by emmaker » Thu Jun 25, 2020 8:28 pm

Faye wrote:
Thu Jun 25, 2020 4:31 pm
Quick question regarding the version 1.1 PCB: In the diptrace file the capacitors C22, C25, C26 and C27 are 330pF, while in the BOM they are 560pF.
Which is correct?
Even though the O&C and uO&C are different either. Look at the original O&C schematics.

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Faye
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Re: uO_c 8hp ornament and crime.

Post by Faye » Fri Jun 26, 2020 1:02 am

Thx

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Faye
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Re: uO_c 8hp ornament and crime.

Post by Faye » Sat Jun 27, 2020 4:31 pm

So I just finished soldering most components on uO_c. Teensy, screen and hardware are not mounted yet.
First I want to measure some voltages. When I look at the schematics, I'm having a hard time to recognize what is supposed to be a reference voltage exactly. Is it only the voltages labeled with "Aref"? What about "3V3_A (powa)" and "3v3+D" as example? Should my multimeter read 3.3v too on these points at any time when the module is powered?

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emmaker
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Re: uO_c 8hp ornament and crime.

Post by emmaker » Sat Jun 27, 2020 5:38 pm

Faye wrote:
Sat Jun 27, 2020 4:31 pm
So I just finished soldering most components on uO_c. Teensy, screen and hardware are not mounted yet.
First I want to measure some voltages. When I look at the schematics, I'm having a hard time to recognize what is supposed to be a reference voltage exactly. Is it only the voltages labeled with "Aref"? What about "3V3_A (powa)" and "3v3+D" as example? Should my multimeter read 3.3v too on these points at any time when the module is powered?
Schematic isn't done well and sucks (or at least the one I have does). Looking at this saw the node of C20, C19 and R13 isn't connected to VREF_2v5 from U2.

When powered with out the Teensy you should be able to measure:
  • +/-12V, about +/-11.4 past the diode bridge.
    +5V
    3V3_A
    AREF_-5, this is from U6
You will not be able to measure:
  • 3V3+D - It comes from the Teensy, won't be there until the Teensy is plugged in. Don't forget to cut the power trace on the Teensy before you plug it in.
    V_bias - This will probably won't be there. It's unclear from the data sheet where VREF_2v5 comes from in the DAC8565 (U2). If it needs 3v3+D it won't be there.
Jay S.

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emmaker
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Re: uO_c 8hp ornament and crime.

Post by emmaker » Sat Jun 27, 2020 5:40 pm

emmaker wrote:
Sat Jun 27, 2020 5:38 pm
Faye wrote:
Sat Jun 27, 2020 4:31 pm
So I just finished soldering most components on uO_c. Teensy, screen and hardware are not mounted yet.
First I want to measure some voltages. When I look at the schematics, I'm having a hard time to recognize what is supposed to be a reference voltage exactly. Is it only the voltages labeled with "Aref"? What about "3V3_A (powa)" and "3v3+D" as example? Should my multimeter read 3.3v too on these points at any time when the module is powered?
Schematic isn't done well and sucks (or at least the one I have does). Looking at this saw the node of C20, C19 and R13 isn't connected to VREF_2v5 from U2.

When powered with out the Teensy you should be able to measure:
  • +/-12V, about +/-11.4 past the diode bridge.
  • +5V
  • 3V3_A
  • AREF_-5, this is from U6
You will not be able to measure:
  • 3V3+D - It comes from the Teensy, won't be there until the Teensy is plugged in. Don't forget to cut the power trace on the Teensy before you plug it in.
  • V_bias - This will probably won't be there. It's unclear from the data sheet where VREF_2v5 comes from in the DAC8565 (U2). If it needs 3v3+D it won't be there.
Jay S.

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Faye
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Re: uO_c 8hp ornament and crime.

Post by Faye » Sat Jun 27, 2020 7:40 pm

@emmaker thanks so much for the detailed reply. I'm so glad that I asked, instead of starting to look for bad soldering. In this case, everything is fine on my module and I can proceed with the build. :) Thank you!

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