Help with my 4018s!!

[Usedtobe]

so i bought these 4018s hoping they would be as easy to hook up as mosc said in this post

http://electro-music.com/forum/viewtopic.php?highlight=4018&t=23896


and they're toootally not, noob i think they call it


any tips on these guys? the clip is what i got out of it today, which sounds really rad but not at all what i'm going for. i've read all the posts on this forum containing "4018" and i still pretty much got nothin. keep thinking "ohhh i get it!" then going to the breadboard and getting immediately stumped again.

thanks guys!

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4018 fail.mp3
Description:	nasty!	Download
Filename:	4018 fail.mp3
Filesize:	1.05 MB
Downloaded:	193 Time(s)

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[sizone]

What is it you're going for anyway? You're not going to be getting 24bit 96khz effects from simple cmos designs.
If you want something that goes "beep beep beep" in a little melodic pattern that can be done. Start with the basics, breadboard a couple of Schmitt trigger audio oscillators (sounds like you already have), a couple of clock frequency oscillators and a couple of very slow oscillators to send to the control inputs. Throw together a 4017/4051 melody generator (schematic's up on this thread somewhere) it's fool-proof and study that to figure out what's going on.
Basic principle of "lunetta" sequencing is this:
You start with a clock frequency. This gets divided in one of two ways.
1:In serial: One division is made at a time in sequence using a programmable counter/divider, ie. with a clock frequency of 4000hz
1/10............1/5.............1/2
400hz 800hz 2000hz
Your control pulses are used to set the division.
2: In parallel: A bunch of different divisions are made of the clock frequency simultaneously, you then use a multiplexer to select which one gets routed to the audio output at any given time. The control signals in this case switch which one of the inputs goes to the output.

[Usedtobe]

appreciate the info but i'm definitely not that much of a newby, i just don't understand this particular chip. Mosc's explanation wasn't enough for me to understand so i was wondering if anyone knew an easy way to hook this bad boy up.

thanks!

[DGTom]

That clip sounds great! thats the thing about lunettas... sometimes you just need to accept what comes out.

From that other thread;

[knittingram]

sounds rad to me.. way better than beep beep boop

[RF]

I think you've pretty much got it.
I'd be pleased to have those sounds moving in and out of my Lunetta patches.

As you come up with new ways to use this chip I hope you'll post them.

bruce

[mosc]

Sorry you are having trouble with these chips. I must confess I've never used these myself as my Lunetta building days we before CMOS logic was around. We used TTL or even RTL. But the principle of operation is the same.

There is an input, an output, and 4 control inputs. The control inputs are a binary number that tells the chip which number to divide by. So, in Lunetta terms, the modulo N divider is really a melody generator.

In this particular chip, 4018, I would try this first. Put a relatively high frequency square wave, like 10 KHz or something, into the clk input. Tie the Preset Enable pin high, pin 10. Listen to the highest of the Q output pins.

If I'm not mistaken, as you change the number on the Jam pins, the pitch of the output will change. If you leave the jam pins unconnected, I'm not sure what will happen. Hopefully, the pins will default to low. If not, you can solve that problem by connecting a large resistor to ground, something like 1 meg might be a good choice. The highest value that will work is what you are looking for.

I hope this helps. If not, please let us know here and we will keep trying with you. This is too good a circuit to miss. It's probably the most valuable circuit in any Lunetta synth.

[mosc]

I've been looking over the CMOS chip data sheets and maybe a better choice would be the 4029. It might be easier to use, but 4018 should be usable too.