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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
my cmos challenge thread
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trav



Joined: Sep 11, 2012
Posts: 71
Location: Auckland
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PostPosted: Wed Oct 03, 2012 12:39 pm    Post subject: my cmos challenge thread Reply with quote  Mark this post and the followings unread

Okay, here is my selection of chips:

4001 x 5 quad 2-input NOR
4011 x 1 quad 2-input NAND
4013 x 4 dual DFF with set/reset capability
4023 x 4 triple 3-input NAND
4051 x 1 8 channel analog multiplexer/demultiplexer
4082 x 2 dual 4-input AND
4093 x 3 quad 2-input NAND Schmitt Trigger
4518 x 5 dual BCD up counter

I am treating this as an opportunity to start a new modular from scratch, using banana jacks, and mounted on 3U rack panels which are ten bucks each from my local surplus. I figure I can fit between four and six modules on each panel.

More to follow.

Last edited by trav on Thu Oct 11, 2012 4:05 am; edited 1 time in total
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trav



Joined: Sep 11, 2012
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PostPosted: Wed Oct 03, 2012 12:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

okay, first module is the 4093: three audio-rate oscillators tuned to hi/med/low frequencies, each with an input for gating, plus an lfo. The lfo is the only one which is always on; the audio-rates have to be gated: there is a logical 1 output on the bottom left for convenience.

Oh, and a crappy mixer / power supply / quarter-inch audio out. The pots aren't even matched, so it's all a bit touchy feely right now; just enough to get myself going. Power comes from an old phone charger wall wart. I managed to melt the socket though, so working from breadboard supply for time being.

Next up, counters!


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trav



Joined: Sep 11, 2012
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PostPosted: Wed Oct 03, 2012 7:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

okay, next is the 4518 dual bcd counter. I wired the fourth output of each counter to its reset, so it just counts up to eight, gives me three octave-downs for each audio-rate clock. And I added some multiples.


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elmegil



Joined: Mar 20, 2012
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PostPosted: Wed Oct 03, 2012 9:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

How is it you have a panel already? I've barely started on my breadboard! Very Happy
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trav



Joined: Sep 11, 2012
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PostPosted: Mon Oct 08, 2012 8:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeah, I probably should have spent more time on the breadboard... I went back and changed the oscillator bank to a simpler four identical gated oscs. then I added a resistor ladder and two 4001s wired up as XOR pseudo-ringmods. next is some kind of melodygen, methinks.


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trav



Joined: Sep 11, 2012
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PostPosted: Thu Oct 11, 2012 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

well, I'm waiting on some pots for the melody generator. In the meantime I built a weird VCA thing based on ezekiel's schematic in the linear cmos thread. This thing takes a clock, 4 ins (CV or data) and 5 outs and everything affects everything else. Have a listen to a quick glitchy patch.


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RingMad



Joined: Jan 15, 2011
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PostPosted: Thu Oct 11, 2012 1:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm, that weird VCA in challenge_snippet_2.mp3 sounds pretty interesting. I'll put that circuit on my pile of things-to-try.

James.
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trav



Joined: Sep 11, 2012
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PostPosted: Fri Oct 12, 2012 3:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's a schematic for what I did. Pretty simple wire-the-chip-to-the-jacks type stuff. The secret is the data to pin 14 thru a pot for depth. I think I kind of understand how this circuit works but I'm not sure I could explain it.

edit: fixed resistor values, not that they're important


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trav



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PostPosted: Sat Oct 13, 2012 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've filled out the panel with a VCO-type thing. It's another 4093 quad oscillator with fixed low-value resistors and a CV in to the RC join. This thing filled up fast! mainly because I really ought to be writing a thesis instead of mucking around with cmos circuits... but I'm going to hold off on buying another panel until my school obligations are out of the way. So this is it for now, though maybe I'll post some more sounds in the meantime.

From left to right: 4093 quad gated osc, 4518 dual divider, 2x4001 XOR pseudo-ringmods, 4093 quad vco, 4001 weird VCA, 3-bit resistor ladder, multiples, 4-channel passive mixer, 5v power in, audio out, master volume.


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trav



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PostPosted: Fri Nov 02, 2012 8:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

found time for a quick little jam...


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trav



Joined: Sep 11, 2012
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PostPosted: Sun Nov 04, 2012 8:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

more VCA fun...


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