[sdiy] low voltage filters

[Ben Stuyts]

(ouch, there = their)

> On 21 Apr 2017, at 16:07, Ben Stuyts <ben at stuyts.nl> wrote:
> 
> I was just looking at the LMH6503. (http://www.ti.com/lit/ds/symlink/lmh6503.pdf) It will run on single 5V with some degradation in specs. There datasheet even has a tuneable band-pass filter.
> 
> Ben
> 
>> On 19 Apr 2017, at 21:38, Chris McDowell <declareupdate at gmail.com> wrote:
>> 
>> Howdy list! 
>> 
>> Wondering if anyone is aware of, or has any tips towards, some low voltage VCF designs. I've seen reports of people using LM13700s with a single 5V supply for VCAs, and their one-off forum posts made them seem happy, heh. I realize this would have very little headroom. I've also checked out Hoshuyama's site, which has a few battery-powered designs. Some things I've considered: 
>> 
>> - Perhaps LM13700 just works at 5V ¯\_(ツ)_/¯ (avoiding breadboard as long as possible…)
>> - Discrete OTA with BJTs
>> - MS-20 Style, like the monotron 
>> - Vactrol, H11F1, or similar 
>> 
>> The point of this is that I have DCOs and ADSRs working wonderfully in a 3.3V environment. Some dirt is okay, I say. Super ideally, I want to implement an SVF with a single 3.3V supply, suggestions toward reality / sacrifices are welcome. I imagine this would work fine with vactrols, but I don't want to design anything with parts I can't buy from mouser, hehe. 
>> 
>> Cheers, 
>> Chris 
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