[sdiy] On the topic of BBDs...

[anthony]

These are almost in fact almost exactly like any incarnation of the 
venerable 4558: RC4558P (TI), JRC4558D (New Japan Radio - old 4-digit date 
code), NJM4558D(New Japan Radio - new 5-digit date code), uPC4558C (NEC) and 
well you get the idea...

Any of them are great to use in a BBD project, but I am especially fond of 
the old works JRC4558DD's (the double-D's are lower noise), the Japanese 
made TI RC4558P's and the NEC uPC4558C - roughly in that order, but the 
latter two tie for second. (I find the NEC take on the TL072, the uPC4072 to 
be superior - I like NEC parts...).

I have A/B tested actual AN6550's that came stock in a Radio Shack Realistic 
"Electronic Reverb" against different versions of the 4558 and they all 
outperform the AN6550 - which is not to say the AN6550 is particularly 
crappy, but...

You're really in luck because it's for more easy to find some version of the 
4558 than an actual AN6550. Panasonic just uses them as examples in their 
datasheets because Panasonic makes them. Curiously enough, Panasonic also 
makes an AN4558. Go figure...

cheers,
aa



> The Panasonic data sheets for the MN series have an application schematic
> using two AN6550s. Is there a pin-for-pin commonly-available replacement 
> for
> that chip?
>
> ~flight
>
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