Tagged Questions

7
votes
1answer
192 views

Ground noise and voltage drop problem

I have an RC device powered by a 3.7V poly battery, which includes a motor and a 40KHz sonar. The voltage across the sonar sensor is amplified and then adc-ed. The motor is driven by a 2KHz PWM. When ...
2
votes
2answers
377 views

How to remove 20MHz SPI signal noise?

I did some SPI software configuration for my DSP board. Then I soldered several missing 0 ohm resistors onto the board so I can tapping the SPI signal from pin headers. Then I measured the SPI Chip ...
-1
votes
1answer
429 views

undervolting processor/mainboard to safely reduce fan speed [closed]

I would like to make my desktop pc less noisier. I do not wish to buy a new cooler, nor fan, nor motherboard. I do not care about decreasing computational performance. The loudest seems to be the ...
1
vote
3answers
459 views

LM317 Ripple Rejection

I've developed a circuit for my model aircraft, which requires 3.3V @ 100mA. My aircraft uses a 3S LiPoly, which ranges from 9V - 12.6V. When the motor is off, the 3.3V supply is good; very low ...