4046

[Kimmo Koli]

On Thu, 21 Nov 1996, Don Tillman wrote:

> I personally haven't done much with them, but here are some ideas:
> 
> First know that this is a phase-locked loop chip, with two (three on
> the Philips version!) very different phase detectors with very
> different operating characteristics.  
> 
> So the most obvious use would be to track other oscillators.
> 
> Or other sound sources.  
> 
> Add noise to the sound source for deliberate mistracking.  
> 
> Screw with the loop characteristics for undershoot and overshoot.  
> 
> Add a bias to the loop for phase shift.  
> 
> Add a divider chain to lock on harmonics, subharmonics, and ratios.
> 
> Use the xor gate to lock onto harmonics within a specific frequency
> range (something like Hammond foldback).  
> 
> Combine the phase detector outputs together.  
> 
> Run a whole string of 4046's one after each other and let their loop
> responses add.
> 
> My point that with all this cool stuff available, it seems silly to
> just use the chip as a square-wave only VCO module.
> 
>   -- Don
> 
One more:
Phase detectors are close relatives to ring modulators, some cheap synths
even use an XOR and claims it to be a ring modulator (close, not but not 
quite...). So why not use the 4046 oscillator a stand alone oscillator. Its
signal is then fed to the phase comparators with an external signal. Then
you have two different weird pulse trails as an output. And every synth
freak can make a use of that...
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
   Kimmo Koli                         Helsinki University of Technology 
   kimmo at ecdl.hut.fi                  Electronic Circuit Design Laboratory
   http://www.ecdl.hut.fi/~kimmo      Otakaari 5 A 
   Tel:  +358 9 451 2273              FIN-02150 Espoo
   Fax:  +358 9 451 2269              Finland 
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