[sdiy] Some thoughts about ladder filter circuit

[mark verbos]

They're good enough for the Serge PCO and NTO. in that case (as well  
as many others) they're used in a transistor oven system.

Mark






On Dec 12, 2008, at 12:59 PM, David G. Dixon wrote:

> General question: Are these arrays suitable for VCO expo circuits?   
> They're
> certainly cheaper than super-matched pairs and quads!
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of George Hearn
> Sent: Friday, December 12, 2008 7:20 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] Some thoughts about ladder filter circuit
>
> The LM3046 from National semiconductor is better than the CA3046 from
> Harris/Intersil in terms of transistor matching (Vbe match).  I've  
> carried
> out a lot of tests with this chip as it's central to many of my synth
> circuits.  They quote a Vbe match of 1mV or better for the LM3046 I  
> think
> and 5mV or better for the CA3046.  In the CA3046 only the diff pair is
> matched to 1mV Vbe wheras the LM3046 they are all matched to 1mv Vbe.
> However, in practice the LM3046 transistors are vbe matched to much  
> better
> than 1mV making them really good for all sorts of circuits for  
> synth diyers
> ready to get down and dirty with discrete designs!  RS has the SMD  
> part for
> 20p in 100pcs.  George
>
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