
Step 5: Install the Pololu voltage regulator (optional)
Because there is a chance that the flight controller’s onboard BEC will not always provide
enough power for the video transmitter, we are going to install a
parallel with the flight controller’s 5v rail. This is usually not required when running 2s but can
reduce the chance of video loss when running 3s.
Use three small (20-24 awg) wires. In our model, we used yellow, black,
and green. Identify the three pin holes on the Pololu. When looking at the
front (the side with the components) and with the pin holes on the bottom,
the pin holes are, from left to right, Vin, GND, and Vout. Tin each pin hole
and strip and tin each wire. Solder the yellow wire to the Vin pin hole,
GND to the middle pin hole, and green to the right pin hole.
Next, tin the B+ pad, the B- pad, and the 5v+ pin hole on the flight
controller. Solder the yellow Vin Wire to the B+ pad. Solder the black GND wire to the B- pad,
and solder the green Vout wire to the 5v+ pin hole.
The Pololu regulator will now ensure steady power to the 5v rail on the flight controller that is
powering the FPV system.
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