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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
cd 4040 reset pin
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jean bender



Joined: Feb 21, 2010
Posts: 133
Location: france

PostPosted: Mon Nov 18, 2013 5:32 am    Post subject: cd 4040 reset pin Reply with quote  Mark this post and the followings unread

Hello !

Well, i don't really see what happens when i'm tweaking with the reset pin of my cd4040. I mean, if i wire it to ground or to the 4096 division pin, i can't see a real difference...

I'm runing it by a 40106 lfo ( 10uf cap).. What should happen when the cd4040 resets ? Is there something noticeable ?

thanks for any help !

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analog_backlash



Joined: Sep 04, 2012
Posts: 387
Location: Aldershot, UK
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PostPosted: Mon Nov 18, 2013 6:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi jean bender.

The answer is no, you're not going to see much difference! If the reset pin is grounded and your LFO (frequency f) is connected to pin 10 of the 4040, you will get outputs at Q1 to Q12 which are at f/2 (Q1), f/4 (Q2)... f/4096 (Q12). All that will happen if you connect Q12 to reset is that there will be no f/4096 output here, as it will reset all outputs to zero as soon as it goes high. If you connect it to a lower output (say Q4), then you will only get outputs at Q1 to Q3, which will still be f/2, f/4 and f/8.

You might be thinking "what's the point of even having a reset pin then?". Well, if you're just using the 4040 as a simple frequency divider, it reallly isn't needed and is normally grounded. For more sophisticated logic uses (for which the 4040 was originally designed) there may well be a good reason for all the outputs to go to zero after a certain event has occurred, hence the need for a reset pin.

I hope that this helps,

Gary
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jean bender



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Posts: 133
Location: france

PostPosted: Mon Nov 18, 2013 7:11 am    Post subject: Reply with quote  Mark this post and the followings unread

ok !! Well, after 1h researches... i thought a bit like what you are explainig ! Thanks a lot !!!
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