Phase Locked Loop

sine_wave · Joined: Sep 25, 2006 Posts: 20 Location: NY

Has anybody ever created a phase locked loop module? Are there any schematics for such a thing? What chip is good for this?

toppobrillo · Posted: Sun Oct 15, 2006 7:10 pm Post subject:

i've never seen a PLL module, though they are used in a number of ways, integrated with other circuits. the 4046 is a robust and versatile integrated PLL system. theres alot you can do with this chip. it has served [very well] as the clock for alot of ideas i have proto'ed..

and it sure is handy as an inexpensive micro-power VCO with very little external circuitry... the way thomas henry controls it in his SN-voice gives it very good range!!

there are alot of schematics out there.. for use just as a frequency follower look at the data sheet.

Scott Stites · Posted: Sun Oct 15, 2006 8:52 pm Post subject:

Scott Gravenhorst has this:

http://home1.gte.net/res0658s/fatman/4046pll.html

It's for the Fatman, but I suppose it could be adapted to other things as well.

Cheers,
Scott

State Machine · Posted: Tue Oct 17, 2006 11:48 am Post subject:

Here is a good link for PLL basics. I have used them in the past for FM demodulation and frequency multiplication.

http://en.wikipedia.org/wiki/Phase-locked_loop

Bill

toppobrillo · Posted: Tue Oct 17, 2006 4:42 pm Post subject:

yeah 'clock glide' could be implemented with one of these.

i was thinking of just that when someone here was asking about adding a little 'swing' to their drum machine triggering...

the idea was to slightly modulate the clock signal, and OR the clock and the delayed frequency from the PLL.. or soooomething like that?.. Wink

could be redundant in certain cases, but an easy sub for a glide circuit/ 2nd VCO- a 'dummy' following vco, like perhaps an addon for the SN-Voice

josh

h-tone · Joined: Mar 23, 2006 Posts: 8 Location: Minneapolis

I made a weird 'tracking oscillator bank' using 3 4046 phase lock loops. The oscillators follow any sort of note that is sent in from guitar, keyboard, or whatever. The tracking is adjustable from almost instantaneous to up to 20 seconds to hit the note like a portamento. It can also be set to play notes at intervals above or below the input note, using a decade counter, turning into an arpeggiator. Finally it can be set to drone a note forever once it locks into the input note. It was inspired by the Boss Feedbacker pedal, but does so much more.
I plan on including a similar modification when I start on my soundlab so that I'm not just limited to square waves.
I can post more info if anyone's interested.

Joel · Joined: Sep 12, 2006 Posts: 97 Location: London, UK

h-tone, that definitely sounds worth a look!

dj_death · Joined: Sep 17, 2005 Posts: 4 Location: Greece

I'm really interested in a reliable pitch to voltage converter for guitar use h-tone.

Tenine · Joined: Sep 13, 2006 Posts: 44 Location: Coventry

ericcoleridge · Joined: Jan 16, 2007 Posts: 889 Location: NYC

I'd also love to see this circuit. I've been looking for a decent frequency follower for a long time.
Would you mind posting it?

Thanks

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

That would certainly take my mind off Barberpole Phasers (temporarily!!!)

Coriolis · Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark

Oh yes - do tell!

C

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

I vaguely remember a sort of guitar synth made by a company called Clark Cabinets which used a 4046 PLL in it's frequency tracking I don't know if I still have the circuit. It also used a chord generator possibly clocked from a processed guitar signal - I wish I knew where to start looking!

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

I hit the right pile of papers first time, it was Campbell Clark Cabinets, I will scan and post it this weekend - both sides of an A3 sheet.

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

http://www.4shared.com/dir/1321731/a7e7124c/sharing.html

It's the 2 files named CClark_synth.

richardc64 · Posted: Sat Jan 20, 2007 11:37 am Post subject:

Heres another:
http://experimentalistsanonymous.com/diy/Schematics/OOP%20Japanese%20Electronics%20Book/gtr-synth.gif

The VCF in this circuit resembles a Steiner.

The same folder also contains a pc board layout.

Another interesting item there is a drum synth.

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

There is a great deal of interesting stuff in there, many thanks.

bugbrand · Posted: Sun Jan 21, 2007 4:28 am Post subject:

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

I've had that for years, I think they advertised in PE or ETI for a while.

Coriolis · Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark

So where did h-tone go? Question

C

Pehr · Posted: Tue Jul 31, 2007 11:27 pm Post subject:

Here's another one http://www.doepfer.de/a100_man/A196_man.pdf Wink

Seems kind of simple to construct a homebrew version of, with not that many external components. Cool

I guess there are'nt any doepfer schematics to find anywhere on the net Rolling Eyes

doctorvague · Posted: Wed Aug 01, 2007 5:04 am Post subject:

dar303 · Joined: Jul 15, 2007 Posts: 97 Location: Sweden

h-tone · Joined: Mar 23, 2006 Posts: 8 Location: Minneapolis

Sorry sorry--
I've been on vacation for a coupla months; and my computer has no internet now (i'm using a friends). I'll snap some digital pictures and try to get them up online (just got back into town 2 days ago). Sound clips might be trickier but I'll see what I can do.

mistercooper · Joined: Jul 17, 2006 Posts: 62 Location: Seattle

I've got one living in the lower tier of my modular.

Posted Image, might have been reduced in size. Click Image to view fullscreen.