Can you explain how to find the capacitor value?You need a much larger value for C1 - it needs to be about 15uF (and R2, R3 and R4 need to be much smaller).
Can you explain how to find the capacitor value?You need a much larger value for C1 - it needs to be about 15uF (and R2, R3 and R4 need to be much smaller).
What happen if i add 33v zener diode parallel to the led? Will the current change?In the most simple version I do not have a filter cap but you can add one. In the plot the voltage across the 10 LEDs is about 33 volts. (green trace) The current is 120 or 100hz pulses averaging about 150mA. (blue trace)
I want the zener diode to act as a voltage regulator.Ask yourself what you want the Zener to do.
Why do you want it?
as ronsimpson explain before, adding zener diode creates a constant voltage circuit.The circuit was designed by some one that does not understand the operation of the supply. The 2.2uF 400V cap limits the current into the load. So a constant current was changed to a constant voltage by a Zener
by Jake Hertz
by Jake Hertz
by Duane Benson