[sdiy] VC Glide

[jhaible at t-online.de]

patchell schrieb:
>     Ok, here are the results, 12 hours latter, like I 
> promised (man, I 
> need to get to bed!).
> 
>     The circuit that I tested is on page 7 of this
> document:http://www.silcom.com/~patchell/smb1/smb.pdf
> 
>     And yes, this is an exponential glide, and I double 
> checked it by 
> looking on the scope.
> 
>     Here it is, from fastest attack time to slowest 
> attack time (ms to 
> seconds) the offset shift is <drum roll>
> 
>     0.02mV, yes, that is right 20 micro volts.  In fact, 
> it was 
> difficult to measure.
> 
>     So, using a CA3280 in an exponential glide circuit 
> gives you 
> basically no control feedthrough....
> 
>    And it should be noted, this is an untrimmed CA3280.  
> A part picked 
> purely at random....

Wow, that's 2 to 3 orders of magnitude better than the
guaranteed specs !
If this wasn't just pure luck, I guess it's time to
buy some 3280's, if they are generally so much better 
than spec'ed.
Do you have "A" types (would still be way above specs)
or the simple ones ?

JH.