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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
latching logic puzzle
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synaesthesia



Joined: May 27, 2014
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PostPosted: Mon Apr 09, 2018 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread
This is how I did it. You can play with it here: http://tinyurl.com/ydz4g9w7
In the simulation I added two 10K pull-down resistors in the input that you won't need if you feed it logic signals. The 100K resistor and the two diodes are for the wired-OR gate.

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Steveg



Joined: Apr 23, 2015
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PostPosted: Mon Apr 09, 2018 4:02 pm    Post subject: Reply with quote  Mark this post and the followings unread
Heh! I didn't notice I could get rid of the NOTs by taking the other output. Well done.
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Steveg



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PostPosted: Wed Apr 11, 2018 1:15 am    Post subject: Reply with quote  Mark this post and the followings unread
It occurs to me that you could probably also do the circuit as I have drawn it below. The feedback resister needs to be a little larger that the input resistors to ensure the 40106 flicks over. The A & B inputs need to run straight back to a gate with no intervening resistors otherwise the voltage balance will get messed up.
Enjoy!

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mike page



Joined: Sep 26, 2016
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PostPosted: Wed Apr 11, 2018 2:57 am    Post subject: Reply with quote  Mark this post and the followings unread
Steveg wrote:
It occurs to me that you could probably also do the circuit as I have drawn it below. The feedback resister needs to be a little larger that the input resistors to ensure the 40106 flicks over. The A & B inputs need to run straight back to a gate with no intervening resistors otherwise the voltage balance will get messed up.
Enjoy!


would a single non-inverting buffer do the same? (4050)
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Steveg



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PostPosted: Wed Apr 11, 2018 3:21 am    Post subject: Reply with quote  Mark this post and the followings unread
Possibly, but it is a lot easier with a schmitt trigger which the 4050 isn't. You'll need the feedback resistor to be just a little more than half the value of each input resistor. But to tell the truth I've never abused non-schmitt trigger gates like that so I can't be sure it will work. If there is any noise you could get a false transition.
If that sounds odd it is because the behaviour of a normal gate isn't defined near half voltage. It might switch it might not depending on the exact design or even the batch. A schmitt trigger chip is required to have defined behavior for slow transitions.
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mike page



Joined: Sep 26, 2016
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PostPosted: Wed Apr 11, 2018 5:58 am    Post subject: Reply with quote  Mark this post and the followings unread
ah ha thanks, I get it
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Steveg



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PostPosted: Wed Apr 11, 2018 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread
If you need a bunch of these gates it is worth breadboarding a 4050 and seeing if it works.
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mike page



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PostPosted: Wed Apr 11, 2018 6:36 am    Post subject: Reply with quote  Mark this post and the followings unread
I was just curious really. I think I'm going to use the 4051 one just because its a funky use for a mux Smile
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Wed Apr 11, 2018 10:36 am    Post subject: Reply with quote  Mark this post and the followings unread
nice one steveg Very Happy

Somewhere on this forum there is a post (which I am probably unable to find now) using a similar
technique for gates. So thanks for reminding me, as it is something I always forget about.

edit: found it
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Steveg



Joined: Apr 23, 2015
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Location: Perth, Australia
PostPosted: Thu Apr 12, 2018 3:45 am    Post subject: Reply with quote  Mark this post and the followings unread
I don't think I've seen that post but it a technique that pops up every so often and I'm sure I've seen it elsewhere in this forum. I'm glad you liked it Very Happy
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elektrouwe



Joined: May 27, 2012
Posts: 143
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PostPosted: Thu Apr 12, 2018 12:41 pm    Post subject: Reply with quote  Mark this post and the followings unread
Steveg wrote:
Possibly, but it is a lot easier with a schmitt trigger which the 4050 isn't..

A 4050 or any noninverting gate with a feed forward resistor IS a Schmitt-Trigger. I'm sure it will be fine too with proper dimensioned Rs
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