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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Yet another sequencer ((edit: answered) question) thread
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Lysol



Joined: Mar 06, 2012
Posts: 12
Location: PA

PostPosted: Sat Aug 01, 2020 12:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

I gave this schem a go on the breadboard as well, which I believe is basically the same principle for cascading them as seen in the 4017 manual.

However though, i'm still left with a similar problem. It will cycle through all 16 steps just fine, but I can't seem to find a configuration using the reset pins to have control over how many steps it cycles through.

Ultimately, I'm trying to get a 16 step sequencer that has the same toggles as seen in the "Little Gate."

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Lysol



Joined: Mar 06, 2012
Posts: 12
Location: PA

PostPosted: Sat Aug 01, 2020 12:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Quote:
Or, to get the functionality that I want would it be more wise to just attempt cascading them as outlined in fig. 19 in the manual? (via an AND gate?).

Although the version in the datasheet is different it works somewhat similar and I don't think it would be muich of an improvement.


Yes, this appears to be the situation I found myself in. Same issue using a transistor AND gate to cascade - reset doesn't work.

PHOBoS wrote:
a much better solution for more steps would be to use a binary counter (4040, 4029, 4520) and a binary to decimal decoder (4514) or a mux (4067) instead of 2 4017s.

I did check and it does appear as though I have a 4040 and a 4051
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Sat Aug 01, 2020 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

a single 4051 will only get you 8 steps, but there are ways of cascading them.

For 2 muxes it is not very complicated and to do this you use 3 outputs of the binary counter
for the A,B,C inputs of both muxes and use another output of the counter to control the INH pin
which has to be inverted for 1 of the muxes.

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