Hi,
I want to build my own RFM69/HW 433Mhz module. I have very little space on my board and a default module is to big.
I found the RF69v1.3 datasheet. Figure 42 shows the schematic of the 433Hz module.
However the default HW board have also a N83 and G4C chip on board. Why is this?
I have the KiCad schematic ready based on the datasheet. However the 2 chips have to land (or not) somewhere.
Any clues?
Thanks
The N83 is a transistor and G4C is a RF switch. They are needed when you want a HW or HCW configuration. The datasheet has a schematic for the 20dBm that includes the RF switch. For W/CW you can go without as can be seen on those modules.
IMO the effort required to make the module is far higher than its worth trying to fit a 16x16mm on your board, ex the RFMHCW.
Quote from: Felix on March 07, 2021, 03:55:24 PM
The N83 is a transistor and G4C is a RF switch. They are needed when you want a HW or HCW configuration. The datasheet has a schematic for the 20dBm that includes the RF switch.
Found the datasheet for the G4C. The N83 not yet. Now I have to reverse engineering the connections of the G4C and N83.
Is the N83 a special transistor for RF? I only found one from atmel. But that one is for higher voltages (80V and higher).
Quote from: Felix on March 07, 2021, 03:55:24 PM
IMO the effort required to make the module is far higher than its worth trying to fit a 16x16mm on your board, ex the RFMHCW.
Yes it is some extra work. But on the other hand I have flexibility to place my components.
If I have my Kicad schematic ready I will place it heren.
The N83 is just a generic BJT, drives the rf switch.