U3 can attenuate all the way down to zero and is really the simplest version of an active "Baxandal volume control". Use a unity gain stable device for this location.
Page 232 and 233 here.
http://books.google.co.uk/books?id=...age&q=baxandall active volume control&f=false
Page 232 and 233 here.
http://books.google.co.uk/books?id=...age&q=baxandall active volume control&f=false
Pleasure
.
Don't worry, it'll be fine
Mooly makes a good point. A unity gain stable device such as the NE5534 i suggested earlier will be fine. And they will also be fine in the other positions too. You could use the NE5532 dual versions if you want to. Any unused + & - inputs should be connected to ground, if you don't use both sections.
@ Mooly
Quite right
@ danny92
It can be made to be unity gain stable though with the addition of one small capacitor between Pin 5 & 8. 20pf should do it.
Some OpAmps are no longer available in 8 PIN DIP packages, so wouldn't fit the board you have ! Search for ones that are. The NE5534/2 are though from Onsemi @ least
Quite right
@ danny92
It can be made to be unity gain stable though with the addition of one small capacitor between Pin 5 & 8. 20pf should do it.
Some OpAmps are no longer available in 8 PIN DIP packages, so wouldn't fit the board you have ! Search for ones that are. The NE5534/2 are though from Onsemi @ least
A unity gain compensated 5534 has poor slew rate.
That's what you throw away in return for gains of less than 5.
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