A simple RF power indicator that consists by a high pass filter a rectifier and an LED array scale constructed by a few transistors and the most important part...figuring the zeners values that correspond to the scale. It's rather complex to precisely calculate the values because you have to take into account various factors like voltage drop from every semiconductor component the output power that corresponds to the given values etc.
-1st LED - 90mW/50ohms/3Vpk-pk
-2nd LED - 250mW/50ohms/5Vpk-pk
-3rd LED - 490mW/50ohms/7Vpk-pk
-4th LED - 800mW/50ohms/9Vpk-pk
-5th LED - 1.2W/50ohms/11Vpk-pk
