Re: Hacking the Si4734: two more PDFs
Wow! Nice bit of work Roy. I see you've drawn it sort of in the style that it's laid-out on the PCB. I'm a little confused by the circuit at Q1 and Q2, however. I think that those may be PNP transistors, which then makes some sense to me. They would be configured as common-collector stages, i.e. emitter-followers, buffering the high-impedance whip antenna.toggle quoted messageShow quoted text
The marking K16 matches these parts:
which are PNP "digital" transistors. I'm assuming these are surface-mount devices.
Thanks for drawing it all out! I love to learn about all the ways radio designers do front-end circuits.
--- In ultralightdx@..., "Roy" <roy.dyball@...> wrote: