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Hi,
It was measurement error I was using standard ground clip for grounding the oscilloscope probe and it was picking up noise. Then I changed to the spring type and could make the proper measurement.
I would still like to get suggestions on improving my design so I am including bottom PCB...
Hello,
I am designing a magneto resistive encoder. For the magneto resistive sensor I am using KMXP5000 sensor, for further signal processing I took IC-TW8 interpolator. The problem I have is the noise in power supply, the noise is only there when IC-TW8 interpolation IC is running, if I reset...
Hi, I have toroidal transformer with two secondary windings. I want to connect these windings in parallel for greater power output. But I dont know if I do it before rectifying or after. Transformer will be used for driving stepper motors. This is the transformer that I will use.
Thanks.
The module has two differential inputs called MIC-P and MIC-N. I too tought that the noise is because breadboard and did build preamp on PCB but was the same story. I found another differential amplifier decided to breadboard it and it works the noise is gone finally. The sound was not high...
Module have built-in preamp with selectable gain, but over 10 m cable the signal gets too weak. I did record a noise and it is attached. Is it normal that this noise appears when I connect negative input MIC-N to gnd ? I tried to connect laptop headphone output to the module and the sound was...
Hello, I used electret microphone. If I connect it directly there is no noise and evryting works fine. Preamplifier that I used is just LM358N preamp for microphones. The noise appears when I connect module and preamp. When I disconnect preamp and module there is no noise on preamp even if I...
Hello, I am using sim900 GSM module. To the module I would like to connect microphone over 10 meter long cable. If I use basic microphone preamp I hear noise when I make a call. If I disconnect preamp and module there is no noise. I think that is because ground connection. Than I decided to...
Hello, I would like to connect audio signal from pc sound card to SIM900 GSM module. I am using simple breakout board from Itead studio, I connected the grounds together and signal form sound card to board input. Only thing that I can hear is noise. If I connect microphone I am able to hear...
Hello, can anyone tell me what symbol FR1 represents on attached document.
Thanks
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I was too fast it is motor protector. You can delete this.
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