As I'm starting off with FPV I didn't want to sacrifice my 'good' quad so I build a smaller one based upon the DJI330 frame.
This is how it looks like
It is a quick and maybe dirty solution but to learn FPV with low cost, it will certainly do.
The FPV setup is powered from a separate 1S lipo.
The TX I got here
The camera here
Overall weight about 12gr
Here is the schema:
Since the TX is a 3V3 version I used a small low drop regulator to handle the 4.2V of the lipo.
The range for the camera is from 3V to 6V so this one is powered straight from the battery.
The cloverleaf antenna was build out of silver plated copper wire 1mm.
The results are quite ok, taking into account that the camera is not high spec.
The goal of this setup was to have a cheap quad for learning FPV.