Gyrator-based filters are around a lot, but the best examples don't come to mind right now. So some rambling:
Those API active EQs, they had 'real' coils, right ?
The Ampeg SVT bass-preamp has this tapped coil for it's active midrange control, but I'm not sure how it'd sound had they been using 'emulation'. It sure is a seeling point of those amps though, up to the point where they've put glossy pics of that inductor in the leaflets. It's vintage, must be good :wink:
The SWR bass-amps (hey, they're labelled 'professional') use opamps & C realizing 'fake-coils'.
FWIW, those Boss distortion pedals use fake-coils a lot to shape freq-response.
It'd sure be interesting to do a comparison between (1) 'real' coil, (2) one transistor gyrator+C, (3) opamp gyrator+C, ... uhh, and how about a tube realizing a gyrator :grin:
... and how then about coils+gyrator for realizing fake-caps ? (patent applied for)
Might be an interesating but totally uneconomical approach to bring some saturating possibilities to previously coil-less filter circuits....
enough !
I think there is one thing what a gyrator can't do... The inductor reacts different from the simulated gyrator circuit. I don't know if it makes big effects with low voltages but...
It could of course be made to do so, but that's then the same story as non-tube stuff emulating tubes etc etc
Haven't tried such a gyrator... iam afraid because nobody else does. Maybe there is a reason for this.
Not unlikely they don't sound 'as pleasing', but note there might be a commercial aspect of it, as in people wanting real old tasting stuff, as mentioned already above @ SVT.
This is fun, and actually the other way around since most stories about gyrators start with the benefits of getting rid of coils.
And while lots of circuits use them, maybe some circuits simply don't use them because of unfamiliarity of the designer with this stuff.
have a good weekend all,
Peter