[sdiy] Some thoughts about ladder filter circuit

[George Hearn]

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

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tom Bugs
Sent: 12 December 2008 14:41
Cc: Synth DIY
Subject: Re: [sdiy] Some thoughts about ladder filter circuit

Yes -- Rapid carries the LM3046 (£0.58) - and yes it is SOIC

Futurlec actually still carry the CA3046 for $0.80 - I've had some from 
them before..

Tom Wiltshire wrote:
>
> On 11 Dec 2008, at 20:48, Simon Brouwer wrote:
>
>> I get the impression that CA3046 is not being made anymore, Intersil 
>> lists the part as inactive, and in any case Farnell doesn't have it.
>
> Intersil might list CA3046 as inactive, but they're still making 
> HFA3046 (and a number of others), which might be a modern version of 
> the part. Only available in SOIC though.
>
> T.
>
>
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