[sdiy] non-mechanical switching solutions
gordonjcp at gjcp.net
Mon Jun 27 16:41:42 CEST 2016
On Mon, Jun 27, 2016 at 09:15:09AM -0500, Pete Hartman wrote:
> 2) some other (electronic, not mechanical) solution that would work in this
> specific instance? Note that while the above description assumes an SPDT
> switch, I can go up to 2 poles, but not beyond. An on-on-on would also be
> an option. Toggle switch is a requirement though.
Your nine pole rotary switch is by far the most expensive component. Opamps are cheap, discrete trannies are cheap, passives are hell of a cheap.
Build four filters, one with each capacitance range, and pick whichever output you want to use. If you use surface-mount parts the whole thing will still be smaller than the original.
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