[sdiy] Steiner filter mods

[Gergo.Palatinszky at nokia.com]

Hi,

Did anybody try a Steiner-filter with germanium diode(s) ?

How does it sounds: warmer / colder / indifferent or useless?  

Thanx
	br,
		Pala

>-----Original Message-----
>From: owner-synth-diy at dropmix.xs4all.nl 
>[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of ext fmg
>Sent: 2005. december 5. 18:17
>To: HOSHUYAMA; synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Steiner filter mods
>
>HOSHUYAMA wrote:
>> 
>> Hello List,
>> 
>> I also built a Steiner-style filter with simple modifications.
>> 
>> Schematic:
>> 
>>   http://houshu.at.webry.info/200511/img_1.gif
>> 
>> Constant current source Q2 reduces common-mode gain of the 
>> differential amplifier to almost zero, resulting in far less CV 
>> feedthrough.
>> 
>> Another modification is the output point to the buffer U1.
>> Response of the resonance pot is more like Korg MS20.
>> 
>> I also used a diode limiter as Yves Usson.
>> 
>> Sam HOSHUYAMA
>> Saitama, JAPAN
>
>Sam,
>
>Shouldn't gate of Q2 be directly to -15V?
>I don't understand how Q2 keeps current constant as is. Was a 
>drawing mistake? I'm confused.
>
>Fabio
>{I want an anatomical zoom
>/Soda Stereo}
>.
>