I couldn't find an explanation on the forum, so please forgive me if calculations for a circuit such as this were already explained.

Please refer to Figure 1.

Simply ... ( or so I thought) - I want to find the current thru R-1.

If I eliminate D-1, I can follow the advise in the forum articles, using 8.2 volts (subtracting the 1.8 from the +10 VDC source) and calculate the resistance of R-1 and R-3 in parallel to find the total current thru R-1 ... BUT,

What is the method to use for this circuit and circuits like it, when the voltages are different across the parallel paths due to different type leds, batteries, etc., or similar devices with fixed voltages or voltage drops in those paths ?.

Thanks,

Bill