I bought 20 of these chips from Ebay, and turns out they're all duff/dead. Can anyone recommend a good source for these please? The ebay price was pretty cheap (80p each, turns out there was a reason for that!) I'm in the UK. Not going to name and shame the seller as I'm waiting to see if I can get a refund/replacement batch.
Alternatively, anyone know of another chip that does the same, maybe with more bands?
(I've used FFT before on the Arduino, but for the project I'm working on I want to free up the CPU time a bit more, so want to use the hardware filtering.)