EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: gtr on March 27, 2019, 01:24:04 pm
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Hello everyone,
Lately I bought this voltage generator https://www.amazon.com/QW-MS3010D-Adjustable-Stabilizer-Supply-Standard/dp/B07GCLK1R2 (https://www.amazon.com/QW-MS3010D-Adjustable-Stabilizer-Supply-Standard/dp/B07GCLK1R2) thinking to use it to replace 1.5V and 9V batteries on fixtures .
Unfortunately here is what gives to the oscilloscope with the generator on 9V in the first image and in the second with a 9V battery.
Does anyone have the same problem with this QW-MS3010D?
What can I do to remedy this noise?
Thank you! :-)
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I'm pretty sure it's a switching power supply. I have a similar unit. It's very cheap, but supplies 10A. It has pretty high ripple and switching noise. Use the scope to measure the power supply directly. You'll see the noise from the power supply. You should use a linear supply. Something like this one:
https://www.amazon.com/Tekpower-TP3005P-Programmable-Variable-Regulated/dp/B06XCQN82X/ref=sr_1_4?crid=OKVALYGDUIMV&keywords=linear+power+supply&qid=1553695249&s=electronics&sprefix=linear+power%2Celectronics%2C130&sr=1-4 (https://www.amazon.com/Tekpower-TP3005P-Programmable-Variable-Regulated/dp/B06XCQN82X/ref=sr_1_4?crid=OKVALYGDUIMV&keywords=linear+power+supply&qid=1553695249&s=electronics&sprefix=linear+power%2Celectronics%2C130&sr=1-4)
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do you have any inductors and capacitors laying around? You could construct a Pi filter on the powerline, and reduce the noise that way.
https://electronics.stackexchange.com/questions/302052/best-way-to-filter-dc-dc-output-noise
https://electronicscoach.com/pi-filter.html
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Hello,
Thank you both for your response. The problem is only with the oscilloscope because the generator works well apart from that. If I connect my probe to another place in the mount, the signal to the oscilloscope is much better and virtually no noise.
I'm going to do so for now while waiting to buy another linear voltage generator.
Thank you! :-)