[sdiy] low voltage filters

[Chris McDowell]

> On Apr 19, 2017, at 3:10 PM, Gordonjcp <gordonjcp at gjcp.net> wrote:
> 
> Whatever the problem, vactrols are never the solution.

I love this list! :) 

I'll check out the Paia stuff, and revisit the diode string stuff. 
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