[sdiy] low voltage filters

[Ben Stuyts]

Those are regular (low voltage) op-amps, not VCA’s.

Ben

> On 21 Apr 2017, at 16:37, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
> LTC6255 / 6256 / 6257 maybe?
> 
> RRIO & spec'd down to 1.8v supply. 
> 
> -Richie,
> 
> Sent from my Xperia SP on O2
> 
> ---- Ben Stuyts 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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>> 
>> 
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