- #1
Vatech
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- TL;DR Summary
- A dc-dc converter causes high ripple that affects the Speech Recognition function . Suggested solutions?
Into a project I am working is use 12Vdc SMPS to power an audio amplifier and some more components. We have no “noise” on that stage.
Then I use a step down converter to convert the 12V to 5V and power a mic preamplifier (Respeaker – usb Mic array) and a development board. There is a lot of background noise, probably caused by the high frequency ripple of the step-down converter.
If I power the preamp directly from a cheap 5v power supply, or a usb port the noise disappears. The problem is that I only have one power source, the 12v, so I need a solution.
Unfortunately, I don’t have oscilloscope. I tried to add 105(1μF) capacitor with 1000μF electrolytic capacitor with no improvement at all.
Should I implement a Capacitance Multiplier
Thank you
Then I use a step down converter to convert the 12V to 5V and power a mic preamplifier (Respeaker – usb Mic array) and a development board. There is a lot of background noise, probably caused by the high frequency ripple of the step-down converter.
If I power the preamp directly from a cheap 5v power supply, or a usb port the noise disappears. The problem is that I only have one power source, the 12v, so I need a solution.
Unfortunately, I don’t have oscilloscope. I tried to add 105(1μF) capacitor with 1000μF electrolytic capacitor with no improvement at all.
Should I implement a Capacitance Multiplier
Thank you