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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Shift Registers
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bugbrand



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PostPosted: Mon Feb 11, 2008 12:10 pm    Post subject: Shift Registers Reply with quote  Mark this post and the followings unread

To get some ideas rolling, here's how I reckon you'd hook up the 4015 Dual Shift Register... As mentioned by Tim Servo in one of the other threads, the inputs are tied to ground with 100k resistors - that's a standard practice (I think?!) - so, if nothing is plugged into them then they'll be kept as a stable low state.

(As a slight aside, though -- sometimes you'll come across chips with pins that are active low - in such cases you'd tie the input to V+ via a 100k resistor)

Anyways, back to Shift Registers ------- you feed some pulse-train into the Data input and the value is read whenever the Clock input goes high. The stored value is then passed down the line (QA to QB to QC to QD) with each successive clock.

I haven't yet tried this circuit, but will soon, no doubt!
Looks right, I think?!


Lunetta_DualShiftReg4015_byBugs.jpg
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Simple 4015 Dual Shift Register
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bugbrand



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PostPosted: Mon Feb 11, 2008 12:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

By the way, there are also these other sorts of shift registers (though some may be hard to find, I think?):

4006 - 18 stage Shift register
4014 - 8-stage shift register
4015 - Dual 4-stage shift register
4021 - 8-bit static shift register
4031 - 64-Bit Static Shift Register
4517 - Dual 64-Bit Static Shift Register
4557 - 1-to-64 Bit Variable Length Shift Register
40104 - 4 bit bidirectional Parallel-in/Parallel-out PIPO Shift Register (tri-state) (((Sounds pretty fancy!)))
40195 4-bit universal shift register

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williamsharkey



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PostPosted: Tue Feb 12, 2008 9:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool, it is like having 4 delay modules.

If the frequency of the of clock is one cycle per second, then you would have:

-Sound input
-1 second delay out
-2 second delay out
-3 second delay out and
-4 second delay out
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mosc
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PostPosted: Thu Feb 14, 2008 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, shift registers are good for delays, but they are great for pattern generators. Each shift register is sorta like a Sample and Hold circuit. The clock input and the data input work that way.

You can chain the last bit (or any bit actually) from one SR to another. Then take some of the bits from one as control bits to a modulo-n divider and it will generate a tune. Take the same bits from the second SR and you will get a canon, one tune played against itself, but delayed.

Use the bits in different order and you'll get harmony.

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jnuaury



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PostPosted: Sat Mar 08, 2008 2:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

i just came across this schematic

http://experimentalistsanonymous.com/diy/Schematics/Oscillators%20LFOs%20and%20Signal%20Generators/Complex%20Waveform%20Generator.gif


i was planning on ignoring everything but the shift register and the xor gates

if this sounds good i figure it should be a nice way to hardwire one half of the 4015
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bugbrand



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PostPosted: Wed Mar 19, 2008 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey, I got a couple more modules done up (and more on the bench too)

One was a dual shift register based on the schematic posted at the top of the page. I got some really nice and very compact rotary switches as an end-of-line from Farnell, so used some here..

Next weeks or so I'll be putting much more detail up on my site such as schematics and front panels, but just thought I'd share for now..

Working on a new portable frame for my modular system (or part of it) so ain't doing much playing until that's done....

Oh yeah - the for the Data input I've used a SPDT Centre off switch -- in the up position it ties the data high, in the middle its disconnected (so pulled low by a 100k resistor) and in the bottom position it is connected to the banana socket.. Seems pretty versatile!


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4015 Dual Shift Register
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loss1234



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PostPosted: Wed Mar 19, 2008 9:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

what do the other knobs do? the schematic up top has no switches or pots?? i made this circuit too...good noise maker!!
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bugbrand



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PostPosted: Fri Mar 21, 2008 1:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh, its not a pot - its a 5way rotary switch --> so I've just taken the four stage outputs and passed these on to the switch with the 1st position offering Off.. I figured it'd be a useful addition.
So, the rotary goes: Off, Q1, Q2, Q3, Q4

(I'll do some more details over the weekend to show the panel.. Behind it is really simple -- small piece of stripboard with the 4015 and just a few resistors etc - that's the Lunetta joy!)

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stolenfat



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PostPosted: Sun Dec 28, 2008 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

with these shift registers could you easily sum up the out puts to get some very powerful sounding squarewaves? or is it best to send the outs towards other chips?
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jnuaury



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PostPosted: Sun Dec 28, 2008 6:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

stolenfat wrote:
with these shift registers could you easily sum up the out puts to get some very powerful sounding squarewaves? or is it best to send the outs towards other chips?


if i am understanding you right, you wont exactly get a big powerful square wave on the output. one thing i have tried in the past is to mix the outs through a simple resistor DAC. if both the data and clock inputs are in audio range you can get some gnarly sounds. if you lower the clock into LFO rates youll get a sequencer or sample-hold like CV source.

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stolenfat



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PostPosted: Sun Dec 28, 2008 6:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

i guess by powerful i just meant 'gnarly' in sound and timbre.

i was pondering an interesting idea of tying the out puts together just to get a wacky out put if it was possible, which would make it less of a shift register and more of wacky waveform changer.




also.... what would the reset in do? If you tossed a clock into the reset jack it would turn the chip off at rates? Or would it be more like a mute? In that it would keep doing what it was doing and just block the sound out?


thanks for all the help, sorry if these are simple or wacky questions, i still dont understand the logics to well, but i'm definitely getting there!
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PostPosted: Sun Dec 28, 2008 7:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

stolenfat wrote:
also.... what would the reset in do?!


as a fairly general rule with these circuits reset inputs sound similar to the sync function on a VCO when you are using the chips for audio

if you are doing control then think of it as a restart or clear
for example if the 4017 counter chip (used in the baby 10 sequencer etc) is pumping out a sequence whenever you send it a pulse it will go back to the first step no matter where it was at
if you rig up the 4015 shift register with a resistor DAC to work as a stepped voltage source it will "empty out" and go to zero volts everytime you reset it (and then start scrambling around again)

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PostPosted: Mon Dec 29, 2008 2:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

one more question!

can the data in receive more than just highs & lows, 1's and 0's, or squarewaves?

Could it receive a triwave/sinewave and still act properly? What about a white noise signal?
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Blue Hell
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PostPosted: Mon Dec 29, 2008 6:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

You can connect arbitrary signals, however they will be converted into digital on/off signals at the input (and slowly changing signals may cause glitches) - so that's a yes and a no Very Happy.

Make sure that the signals stay within the port's power supply range, if not the chip will be killed.

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