- #1
Boltzman Oscillation
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- 26
- TL;DR Summary
- I do not see a modulator on this receiver. Can anyone let me know where it is?
I am trying my hands on building receivers and transmitters. For now I would like to build this receiver here:
now I see that the 500pH inductor in parallel witht he 200uH capacitor are in charge of filtering the unwanted frequencies. The top-left NPN is in my guess an emitter follower to prevent loading? I've no idea what the middle NPN is for. I also have no clue what the right-most NPN is for but my guess is as an amplifier simply because I assume every radio needs an amplifier of some sort (I am probably wrong). The demodulators I am used to seeing are the ones that use diodes. Now since BJTs are sort of like diodes then I assume that you can possibly use them for demodulation as well? I don't know really. Any help is appreciated.
now I see that the 500pH inductor in parallel witht he 200uH capacitor are in charge of filtering the unwanted frequencies. The top-left NPN is in my guess an emitter follower to prevent loading? I've no idea what the middle NPN is for. I also have no clue what the right-most NPN is for but my guess is as an amplifier simply because I assume every radio needs an amplifier of some sort (I am probably wrong). The demodulators I am used to seeing are the ones that use diodes. Now since BJTs are sort of like diodes then I assume that you can possibly use them for demodulation as well? I don't know really. Any help is appreciated.