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Built a Chinese dac... Distortion and power issues..?
Built a Chinese dac... Distortion and power issues..?
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Old 26th November 2017, 12:35 PM   #11
Wungun is offline Wungun  Canada
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Weird issue is I need to flex the pcb
It's a simple board... Layer on top, layer on bottom.
How did you fix it?
Can you heat and solder the via joints?
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Old 26th November 2017, 03:24 PM   #12
Wungun is offline Wungun  Canada
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Would this be a likely point of complete audio output failure?
The lcd display, however, doesn't unlock from signal at all when the board flexes and output is lost, so....
Maybe not entire power to dac chip is loss?

Inkeds-l1600_LI.jpg
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Old 26th November 2017, 03:58 PM   #13
Wungun is offline Wungun  Canada
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Also, 30.6VDC at single opamps, but 31.4VDC (same output V as my PSU) at the dual Burson's...
Could this be the reason for the output distortion?
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Old 26th November 2017, 05:21 PM   #14
davada is offline davada  Canada
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It could be a mild short. If you're hearing power supply hum, ripple on the dac output. Flexing the board might resolve partial a short. Measure the current from the power supply and see if is unordinarily high. Check for large amounts of power supply ripple.
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Old 26th November 2017, 05:25 PM   #15
HumbleDeer is offline HumbleDeer  Belgium
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a short can be indicated by excess hum on your supply if it's linear (like a toroidal or EI)
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Old 26th November 2017, 06:05 PM   #16
Wungun is offline Wungun  Canada
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Quote:
Originally Posted by davada View Post
It could be a mild short. If you're hearing power supply hum, ripple on the dac output. Flexing the board might resolve partial a short. Measure the current from the power supply and see if is unordinarily high. Check for large amounts of power supply ripple.
No, the audio output is very "black" and silent in the background... No hum or buzz or static... Just mildly but perceivably distorted.
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Old 26th November 2017, 06:07 PM   #17
Wungun is offline Wungun  Canada
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Quote:
Originally Posted by HumbleDeer View Post
a short can be indicated by excess hum on your supply if it's linear (like a toroidal or EI)
I think not a short but rather a disconnect...? Like a supply ground lifting or something.
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Old 26th November 2017, 06:13 PM   #18
Wungun is offline Wungun  Canada
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Quote:
Originally Posted by davada View Post
Check for large amounts of power supply ripple.
Not sure how...
Do I need a scope or can it show on a multimeter.?
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Old 26th November 2017, 06:44 PM   #19
Mark Whitney is offline Mark Whitney  Netherlands
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Looking at the photo in post 1. Many of the through hole solder joints look really bad. The solder should have a nice shiny surface that connects the leads/pins on both sides of the board.
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Old 26th November 2017, 06:55 PM   #20
Wungun is offline Wungun  Canada
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Quote:
Originally Posted by Mark Whitney View Post
Looking at the photo in post 1. Many of the through hole solder joints look really bad. The solder should have a nice shiny surface that connects the leads/pins on both sides of the board.
They're shiny on the bottom side, where I soldered them. I'm always concerned about overheating components and maybe that's why the top side looks shitty?
Do these thru-hole solder points attach the component to different planes??
I can reheat the top sides of most of those joints I think....
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