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My periodic ON-OFF timer don't work. They are two CD4541.

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tong

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I don't know why my periodic ON-OFF timer don't work. They are two CD4541.

I don't know how Master Reset (MR) pin work.

LOW -> HIGH = stop oscillator, output unchange ?
HIGH -> LOW = start oscilator, reset counter, output change ?

I test by install only the Right chip.
The output remain HIGH all the time.
I try to reset by apply V+ to MR pin, the output still HIGH.
I remove V+ from MR pin, the output still HIGH.

The Right chip do set "Auto Reset" when power on.
The Left chip don't set "Auto Reset".
 

tong

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C on pin 2 has a pole ?
My 0.1uF tantalum has a pole.
 

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