Different supply voltages within feedback loop- Any problem?

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barefoot

barefoot

Well-known member
Joined
Jun 4, 2004
Messages
93
Location
Portland, OR
Any fundamental problem with the circuit below? I figure since U2 has a gain of 2, the output can swing near 24V even thought U1's supply is only 15V. And since U1's negative input only sees 1/10th the output swing, there's no risk of the feedback loop overloading U1.

This works, right?

different-supplies.jpg


Thanks,
Thomas
 
Thomas that all looks fine. You could generate the +/-15v rails by just two resistors and two small smoothing caps as U1 current draw will be constant because of the high impedance into U2 +. Basically U1 will run in Class A as the bias current in its output stage is not being used so it will not switch over to the class B at any stage which is all good.

Joe
www.jlmaudio.com
 

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