Attention: fup2!
Dear experts,
A "few" years ago Analog Devices launched SSM 2000 "Hush", a noise reduction IC. Together with it they offered an evaluation board of which I have schematic and circuit description but can't find component placement plan and the board's layout which is difficult to reverse engineer because the solder mask is black and absolutely opaque.
It would be great if somebody here could provide these searched for documents.
TIA
Reinhard
Why do you care?
Cheers
Phil Hobbs
Phil Hobbs schrieb:
[...]I'm trying to de-noise old tape recordings of performances of an amateur choir before burning them on CD. Of course I've tried that with digital audio software but in my impression/experience there are always audible artifacts after software de-noising, especially at low audio levels.
So I'd like to try it the analog way. HUSH is said to work even with Dolby compressed recordings. In the circuit description they show a small additional circuit for optimizing level matching which has to be integrated in the circuit of the eval board. For that purpose I'm searching for layout and component placement plan.
Best regards
Reinhard
Ah, okay, understood. If you can scrounge up a NIR filter that passes, say, wavelengths longer than 750 nm, and use an incandescent light source and a camera, you might be able to see the traces through the black mask, assuming that it's coloured by organic dye and not carbon black.
Cheers
Phil Hobbs
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