Farhan - the SWR Bridge board I have has two small potentiometers for adjusting the output voltage of the forward and reflected readings. The detector diodes are 1N5711 schottky diodes. Looks like you have selected 1N63 Germanium diodes for the detection circuitry in the V2. It would not be difficult to for me to swap the 1N5711 diodes out with 1N34 Germanium diodes if the voltage vs power curve difference becomes an issue.
I see a potential issue with the digispark module in that it's USB bootloader has a 1.5K pull-up resistor on the ADC3 input pin. I may need to have a #define in the Arduino code to change the ADC input from ADC3 to ADC1 if a digispark is being used. The other option would be to remove the 1.5K pull-up resistor from the board, and install one in a USB extender cable that's dedicated to programming the digispark. I'm not expecting that it will need to be programmed all that frequently, but the capability to do so needs to be maintained.
73; Steve, N3SB
