[sdiy] ALFA clone chips?

Richie Burnett rburnett at richieburnett.co.uk
Mon Mar 29 13:30:37 CEST 2021

> They were built out of floor-sweepings grade parts.  They were shit.
> And no two sounded even vaguely the same.

Well, I think they all sounds great! :-))

There's also an electrolytic capacitor that's fitted backwards in the TB-303 
too!  I've not heard it discussed much, and can't even remember which one it 
is now, but I discovered it when analysing the circuit and checking it 
against the actual populated PCB.  It has got significant DC bias across it, 
and it's a polarised capacitor but fitted the wrong way round.  I didn't get 
round to de-soldering it and comparing its C and ESR with the others that 
were fitted with the correct polarity but I'd imagine that has got to have 
an effect over the years.  To be honest the crappy phenolic PCB in there is 
so old that I'd get worried de-soldering anything from it now!


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