Joined: Mar 29, 2012 Posts: 47 Location: Malvern, Ohio
Posted: Sun May 13, 2012 4:44 pm Post subject:
I just finished my module for this. Of course after I put it in the case it didn't work right, but after troubleshooting it all day, it's finally done!
I ended up making a module with 2 of the original circuits minus the clock. I also added a switch so the clock input into the 4040 & 4006 could be the same clock (like in the original) or 2 different clocks.
I'll try to post a picture when I can.
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The weird thing is - I tried to breadboard this again tonight and now I can't get it to work. The only change is I changed the 40106 osc for a 4046 VCO.
I just get the base note and it rises and lowers slightly in volume.
Did anyone else have any issues getting this to work? _________________ JacobWatters.com
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Mon May 14, 2012 11:42 pm Post subject:
Cynosure wrote:
i got it. remove the resistor from pin 3 to the output on the 4006 and make sure the clock runs VERY high.
great, and that makes sense. I allready removed that resistor since it only added the source frequency
(which is high). Add a resistor to the data input of the 4006/output 4040 instead. a 4046 VCO is on
my list of things to try or maybe a simple 555 VCO.
I'm now working out which connections between the 4015, 4040 and oscillators sounds best,
to see how I want to hardwire some switches. But I should finish up another circuit first to get some
more breadboard space.
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Tue May 15, 2012 9:44 am Post subject:
4015 Stepped Wave generator Lunetta module
ok here's an idea for a versatile 4015 Stepped Wave generator Lunetta module. It's setup as a dual
4-stage 'wavegenerator' , but I added some switches so it can be used as an 8- stage aswell. (all 3 switches closed).
My first idea was to use the switches to select either a seperate input signal or link the 2 together,
but I decided to add some diodes so you can do some weird modulations aswell.
The opamps are configured as a voltage follower and act as a buffer. And because of the high impedance inputs
I changed the resistors to 100K which reduces the current draw. I'm not sure which opamp would be usefull,
a single power rail to rail makes sense, but not I'm sure, I 'll have to do some tests to see what works.
The 4040 is not included since there are many ways to patch it and it deserves it's own module anyway.
just as the oscillators. I also didn't include the caps for sine and spiked outputs, they can be added
but probably have to be smaller because of the 100K resistors, it also depends on the frequency
you use it for, so experiment!
some extra options:
- wire all the outputs of the 4015 to the panel
- add switches between the ouputs of the 4015 and the resistors
- use pots
btw this is only meant as a LUNETTA module,. not as a synth module (yeah I know a Lunetta is a synth too).
In that case i would add comparators for each input and some extra opamps to get a 10Vpp (or whatever
you like) output signal.
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Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Tue May 15, 2012 2:01 pm Post subject:
4051 Sawtooth generator
You can also make a sawtooth* wave with it.
You could leave the resistor attached to pin 2 in place (so you can do this with the lunetta module),
the amplitude will just be a bit lower.
hmm, just got another
so there migth be another schematic coming up (if it's possible)
*I thought it was called a ramp and the other way around a saw, but according to wikipedia that's called an inverse saw
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Stepped Sawtooth wave with a 4015
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You're on fire, PHOBoS! I still have yet to write here about some observations. A more pressing project required attention. Thanks for sharing your schematics.
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Wed May 16, 2012 5:27 pm Post subject:
Saw with stepswitch Subject description: 1,2,5 step
ok here's kinda what I was thinking about yesterday, which is using a switch to control the number of steps.
My initial idea was to switch the reset to different outputs, but offcourse this changes the frequency and
with all the resistors in place the amplitude. It is possible to keep the amplitude the same but that
involved a 7x7 switch (or something like that). Allthough there are probably ways to do it, maybe
with opamps or more logic.
I did manage to do it but only with 3 settings: 1-step (square), 2-step and 5-step. all with the same
frequency and amplitude. So here's a schematic of that in case anyone is interested.
For a standalone device I'm just gonna add switches between all the resistors which gives more options.
And probably a 4520 instead of a 4040, which is a dual 4 bit counter but you can use it as an 8 bit aswell.
I also did a quick test with an inverter as shown by Nardu, with a switch to select triangle or saw. If you
use a DPDT switch and add a 4040 or 4520 or flipflop or anything else that divides by 2, you can keep
the same frequency. (I can draw a schematic for this if it's not clear how to do it)
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Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Thu May 17, 2012 3:14 am Post subject:
Cynosure wrote:
2 x 4066 = 8x8 switch
and nice work
you need a little more then that. With 7x7 I mean like a rotary switch with 7 switches with 7 poitions each.
something like this
but with 7 'decks'
. with the 4066 you do have control over every switch so you can wire it in a different way than with a
mechanical switch, and can probably get away with 4 or maybe only 3 chips
Nardu, that's interesting stuff about the Walsh functions. I notice something strange with the schematics / simulations you posted... IC1 seems to be
labelled a 4016, which is a bilateral switch. Shouldn't this be a 4015 shift register, which is what it looks and behaves like?
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
Posted: Thu May 17, 2012 7:09 pm Post subject:
LFO test
I made a little testboard to save some breadboard space and I added a dipswitch so I don't have to keep
pulling out/adding resistors. (and no more dodgy connections). For the opamps I tested a TL082, uA741, and
LM358 (= 1/2 LM324). That last one worked ok so I didn't test any other ones. I did need to add an extra
pulldown resistor else the signal clipped. 100K for each set of 4 works nice, but instead of just a resistor
I added a pot. (one side to the resistors, other side to GND, wiper to opamp) which makes it possible to
adjust the amplitude of the wave.
This allready proved to be very usefull when doing some tests with it used as an LFO to control 2 VCO's. Because
I can adjust the amplitude I can also control the voltage of the steps, so I tuned it untill I had a nice sequence.
I did record somes sounds but have to edit the file first, So I'll post some later.
Here's a schematic of how I used it as an LFO, I did change it a bit while I was playing with it so i added some
switches to show what I think are the different connections I made.
and a picture of the testboard
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waveshaper setup for LFO test
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4015 waveshaper testboard =)
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Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Fri May 18, 2012 1:36 am Post subject:
That looks very neat and tidy I look forwards to hearing the sounds! _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
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