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 Post subject: Re: ECM-1240 counter questions
PostPosted: Wed Aug 04, 2010 9:05 pm 

Joined: Fri Jun 04, 2010 11:11 am
Posts: 127
Looks like you have a valid pulse going to the input of the divider (pin1). I would suspect that power supply noise might be causing problems. Do you have any capacitors at your disposal? Something in the range of 10uF to 100 uF? If so, try installing it between pin 7 and pin 14 (Vdd & Gnd) of the IC ..... remember to observe the polarity of the capacitor.

If you do not have a capacitor, then I would suggest using three 1.5V batteries in series as your power source.


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 Post subject: Re: ECM-1240 counter questions
PostPosted: Wed Aug 04, 2010 9:29 pm 

Joined: Sat Jul 10, 2010 11:06 am
Posts: 38
I will give those ideas a try.

Are you saying replace the .1uF cap that is currently between pin 7 and 14 with a 10uF or 100uF cap? Does it matter what kind? Your original diagram said to use a ceramic capacitor but I was only able to find a multi-layer ceramic cap. Does that make any difference? Also, I couldn't find any polarity indicator on the .1uF caps I have.

Thanks,
Ira


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 Post subject: Re: ECM-1240 counter questions
PostPosted: Wed Aug 04, 2010 11:00 pm 

Joined: Fri Jun 04, 2010 11:11 am
Posts: 127
Leave the current .1uF in the circuit. There is no polarity on those caps. The large cap values are polarized.


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