[sdiy] triangle core VCO comparators

[David G Dixon]

I use LM311 in all my tricore VCO designs (the Dixie and the Rubicon).
Unlike an opamp comparator, it allows me to set the output voltages to be
compatible with the rest of the design, and not the "nearly-rail" voltages
of a TL07X opamp.  It's also faster, so adds less error to tracking.
However, if your design can accommodate the nearly rail-to-rail output of an
opamp comparator, it would work just fine.

 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] 
> On Behalf Of Chris McDowell
> Sent: Wednesday, February 17, 2016 4:49 PM
> To: Synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] triangle core VCO comparators
> 
> howdy, 
> 
> I'm wondering about the choice of comparator for triangle 
> core VCOs. I've seen it done a few ways, like Thomas Henry's 
> discrete comparator, or the LM311 in J3RK's (STROH Modular) 
> VCOs on Muffs, and my own builds just use TL07x and work 
> -pretty much- great. But I'm wondering what the experiences 
> and preferences are of you here on the list. Fast op amp? 
> Real comparator? Doesn't matter? I'm aware that it only 
> matters as much as HF-Tracking matters, but I'm interested in 
> opinions anyway. 
> 
> Cheers!
> Chris
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