??? 05/05/10 01:39 Read: times |
#175688 - 25V is too coarse Responding to: ???'s previous message |
The first reason i avoid optos for ZCD is the coarseness, in this case its 25V which is roughly 10% of 240VAC.
Second,heating in the current limit resistors, for which one has to go for double the actual required wattage - increased cost and board space third, aging of the led in the opto. i am bending towards High value Resistor divider method which can sense close to 1.3 - 3.4 V, any rough drafts or designs available ? Once again Thanks for all the inputs and ideas. Regards, Arun |