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Originally Posted by michael
Excuse me I correct my purpose was -4.5 V.
the size is 174 Kb, and tried every thing; renaming .. and other trickes, didn't work.
Ecxact now, my EE friend called and told he has input frequency up to 4N35 and after that has no output to 555 he has done every thing. He told there is a point or problem and has no info of 4N35 features. If you lead us what should have done will be appreciated.
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Try a resistor (10k..47k) from pin6 (4N35) to -4.5v.
Good luck