[sdiy] New VCO... maybe...

[Roman Sowa]

That's low power part, like in 1uA range for, wearable electronics, or 
energy harvesting applications. Obviously it's very slow because of 
that, not suitable for VCO.
Besides it's not my intention to use such exotic parts that fade away so 
quickly.

Roman


W dniu 2020-12-10 o 17:20, Mike Bryant pisze:
> Have a look at the TLV2702 - one op-amp and one comparator in the same package.  Might keep the layout more compact.
> 
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Roman Sowa
> Sent: 10 December 2020 09:43
> To: Spiros Makris
> Cc: SYNTH DIY
> Subject: Re: [sdiy] New VCO... maybe...
> 
> The idea behind it was to keep parts count low. I's appealing when one 14-pin chip does basicaly all.
> I plan to use comparator and dual opamps instead of quad in SMD version of it. But I don't expect much improvement, 500ns instead of 2us reset time by the cost of using completely different ICs would be huge success.
> If my estimations are correct, current HF tracking error is 15 cents at 4kHz, while with 0.5us reset it could go down to 4 cents. Some sort of compensation is probably simpler than speeding up the circuit.
> 
> Roman
> 
> W dniu 2020-12-10 o 09:44, Spiros Makris pisze:
>> Have you tried using a dedicated comparator IC instead of an opamp?
>> Opamps make pretty bad comparators in practice, perhaps you can extend
>> your range somewhat by changing it.
>>
>> On Thu, Dec 10, 2020 at 9:49 AM Roman Sowa <modular at go2.pl
>> <mailto:modular at go2.pl>> wrote:
>>
>>      That still would be better than turning this list into C
>>      programmer's chat.
>>
>>      Also please, no disrespect to anybody
>>
>>      Roman
>>
>>      W dniu 2020-12-10 o 05:11, Shawn Rakestraw pisze:
>>       > I am patiently waiting for Mr Hutchins to split the thread off into
>>       > his own and lead off with a paper about why making CDs won't work,
>>       > then explain that this has already been done.
>>       >
>>       > And PLEASE take this with the humor that I intend it as! No
>>       > disrespect, just humor :)
>>       >
>>       > On Wed, Dec 9, 2020 at 6:21 PM Aaron B. <aaron at zadzmo.org
>>      <mailto:aaron at zadzmo.org>
>>       > <mailto:aaron at zadzmo.org <mailto:aaron at zadzmo.org>>> wrote:
>>       >
>>       >     On Wed, 9 Dec 2020 22:56:22 +0100
>>       >     Roman Sowa <modular at go2.pl <mailto:modular at go2.pl>
>>      <mailto:modular at go2.pl <mailto:modular at go2.pl>>> wrote:
>>       >
>>       >     > I haven't used that phrase for long, so here it goes:
>>       >     > Comments welcome!
>>       >     >
>>       >
>>
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