Re: ZN414 and TA7642 radios
Andrew2's test result matches my results, for the output of the chip with no amplification.
I have tested the Thai Future Kit (FK709). The 32 ohm speaker I was getting turned out to be the same diameter as an English 1p coin! Like that's going to sound powerful, so I soldered a jack to the output terminals and used some Sony headphones instead.
For power I was using a pair of re-chargeable AA's.
The external aerial wire was very short & I wound it around a screwdriver shaft to make a spiral. If you wanted a longer external aerial insert a wire into the coil , making a loose coupler.
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