[sdiy] PLL module

[Scott Gravenhorst]

cheater cheater <cheater00 at gmail.com> wrote:
>so is that basically an 'octaver'? I don't know how these work - but
>the effect should be similar, right? audio in, octaves (or in this
>case, 'harmonics') out? Or does it output CV?
>
>Cheers
>D.
>
>On Wed, Apr 7, 2010 at 14:40, Scott Gravenhorst <music.maker at gte.net> wrote:
> I designed this PLL circuit for audio to track a FatMan VCO and 
>produce 1F, 1.5F, 2F, 3F, 4F, 6F and 12F outputs.  Lag time is 
>adjustable and can be made quite insignificant at the low end.

It is a frequency multiplying 4046 phase locked loop circuit that receives a VCO output
as it's input.  It synchronizes to the input and produces audio.  It is not a CV
processor.  The audio outputs are at frequencies 1F, 1.5F, 2F, 3F, 4F, 6F and 12F given
the VCO is at 1F.

2F and 4F are 1 and 2 octaves above the input. 1.5F, 3F, 6F and 12F are all perfect
fifths at zero or more octaves above 1.5F (relative to the input frequency of 1F).

It was the perfect fifths for which I built it, but the octaves were there by default, so
I brought them out to the panel as outputs as well.
 
>http://home1.gte.net/res0658s/fatman/4046pll.html

It is definately a "fattener" as the OP wrote.  Playing with the lag or damping control
is also lots of fun as at the long end, it produces a portamento effect.  At minimum
settings, no portamento is audible.


>Original Message ----- >>From: "Sean Ellis" 
><tensiontype at hotmail.com> >>To: "Sean Ellis" 
><tensiontype at hotmail.com>; "Julian" >><julian at port23.co.uk>; 
>"Harry Bissell" <harrybissell at wowway.com>; >>"Jason Proctor" 
><jason at redfish.net> Cc: >><synth-diy at dropmix.xs4all.nl> Sent: 
>Tuesday, April 06, 2010 11:15 >>PM Subject: Re: [sdiy] trolls and 
>unicorns >> >> >>D'oh! PLL is what I meant, it's late.... >> 
>>>----- Original Message ----- >>From: "Sean Ellis" 
><tensiontype at hotmail.com> >>To: "Julian" <julian at port23.co.uk>; 
>"Harry Bissell" >><harrybissell at wowway.com>; "Jason Proctor" 
><jason at redfish.net> >>Cc: <synth-diy at dropmix.xs4all.nl> >>Sent: 
>Tuesday, April 06, 2010 11:07 PM >>Subject: Re: [sdiy] trolls and 
>unicorns >> >>> Back to business, why are there so few PPL 
>modules out there? A long time >>> ago I made a crazy module with 
>a PPL at its heart, it was based on a >>> harmony circuit that 
>was supposed to perform a backup when a person >>> whistled a 
>tune. With some careful additions it turned into an amazing >>> 
>'fattener' module for synths, the tracking was awful and sounded 
>like your >>> drunk friend trying to see what keys you were 
>pressing....I always >>> wondered why people dont use PPLs more. 
>> > -- ScottG > 
>________________________________________________________________________ 
>> -- Scott Gravenhorst > -- FPGA MIDI Synthesizer Information: 
>home1.gte.net/res0658s/FPGA_synth/ > -- FatMan: 
>home1.gte.net/res0658s/fatman/ > -- NonFatMan: 
>home1.gte.net/res0658s/electronics/ > -- When the going gets 
>tough, the tough use the command line. > > 
>_______________________________________________ > Synth-diy 
>mailing list > Synth-diy at dropmix.xs4all.nl > 
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy > 
>_______________________________________________ Synth-diy mailing 
>list Synth-diy at dropmix.xs4all.nl 
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>

-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.