Hi,
I'm doing a project where I attach an FPV camera (camera and video transmitter) to an existing quadcopter powered by a 3.7V lipo battery. I want to use the battery as power for the FPV camera.
The motors are brushed and very noisy, ripple voltages are around 0.3V and varies in frequency with motor rpm. The FPV camera blacks out when the propellers start spinning, even though the voltage never goes below 3.0V (but very, very near), and I've tested the FPV camera so I know it functions down to right about 3.0V.
I have replaced the capacitors across the motors, they were 22nF and I put in 100nF. I put a filter cap 47uF tantalum across battery leads. This all helped very much, the ripple is just 1/3 now but FPV camera still blacks out, so I think I need a voltage regulator.
Weight is really important here, so I can't use a module, and I prefer no inductors or very large caps. I increased the weight from 12.5 grams to 13.01 grams by adding the camera and the flight time was halved... Not sure how the existing electronics are powered from this noisy source, I don't see a voltage regulator on the board so maybe they are 1.8V capable and a zener diode as regulator maybe.
Appreciate any help, thank you.
I'm doing a project where I attach an FPV camera (camera and video transmitter) to an existing quadcopter powered by a 3.7V lipo battery. I want to use the battery as power for the FPV camera.
The motors are brushed and very noisy, ripple voltages are around 0.3V and varies in frequency with motor rpm. The FPV camera blacks out when the propellers start spinning, even though the voltage never goes below 3.0V (but very, very near), and I've tested the FPV camera so I know it functions down to right about 3.0V.
I have replaced the capacitors across the motors, they were 22nF and I put in 100nF. I put a filter cap 47uF tantalum across battery leads. This all helped very much, the ripple is just 1/3 now but FPV camera still blacks out, so I think I need a voltage regulator.
Weight is really important here, so I can't use a module, and I prefer no inductors or very large caps. I increased the weight from 12.5 grams to 13.01 grams by adding the camera and the flight time was halved... Not sure how the existing electronics are powered from this noisy source, I don't see a voltage regulator on the board so maybe they are 1.8V capable and a zener diode as regulator maybe.
Appreciate any help, thank you.
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