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Cgs synth

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Re: Steiner filter questions

2003-11-08 by sasami@hotkey.net.au

>--For best audio performance, The 2N2222's connected to the 2K2
>resistors (one base tied to LP, one base tied to Ground) should be
>matched.

Probably. See below.

>--The diodes in the ladder don't need to be matched.

Technically matching would "help", but being a filter it probably wouldn't
be that noticable. - the difference in capacitors etc would probably out
weigh it.

>--If I were to put attenuator pots on the LP, BP, HP inputs, I should
>probably put a buffer (good quality op amp etc) between the pots and
>input 47K resistors.

No. Just use 50k pots directly.

>--To add additional CV mod sources, just hook more 220K resistors (or
>whatever) to base of the leftmost 2N2222 and put the CV on the other
>side.

Exactly.


Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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