A low power AM transmitter kit from AliExpress caught my interest. It was AU$30 and is crystal locked to 21MHz.
The board is good quality and went together easily.
Component values are marked on the board, which is handy because the supplied documentation is a bit different to the actual board. One ceramic capacitor and 4x 47uF electrolytic capacitors were missing but easily found in the junk box. There was a handful of extra small value components along for the ride.
It does work but sounds a bit rough.
I'll update this post at a later date with some measurements.
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