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Help on driving CS8190 Driver

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Ehsoon

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hi dears.
I'm a bit new in Electronic, and now want to make a tachometer. I designed protection and supply circuit according to CS8190 datasheet and another tachometer's PCB. I've produced the 8.9v DC voltage for pin8 of CS8190 and a square wave to pin3. but now I can't see any thing in pin2. Can any one guess where the problem can be?
 

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    Ehsoon

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yes Frank,I am. And my last problem has been solved :grin: , now I'm trying to calibrate the tacho according the given data. I calculated C4 and Rt(mentioned in cherry datasheet) for 5KHz Max freq. and 278deg, 0.47uF and 17.37Kohm(using a 20K potentiometer), but i think they're not properly calculated, because the needle didn't work right :?:
 

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