[sdiy] TDA7052A as VCA

[Paul Perry]

If it is true that operating wiht the neg rail disconnected fries the chip,
one would have to be careful about what happens as the + and -
power rails turn on.
This is one of the difficulties of SDIY - dealing with direct coupled
signals all over the place, including connecting systems with completely
separate power supplies.
Unfortunately, anything that you can imagine will probably happen one day..

paul perry Melbourne Austrlaia

----- Original Message ----- 
From: "David G. Dixon"
> Yes, and I can add (from personal experience, this time) that 2164
> absolutely HATES having its power pins compromised in any way.  Not only
> will reversing the power pins fry it instantly (no big surprise) but only
> connecting one power pin will also fry it (that happened to me the other 
> day
> when one of my power connectors failed to make contact -- the -15V one, I
> think.  All the 2164s on that rail died when I powered up the cabinet --
> luckily there were only three -- I immediately pulled every power 
> connector
> out of my cabinet and am replacing them with a higher quality product).  A
> more robust expo VCA would actually be most welcome in many different
> situations.