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A bit of reading later:

TI Single Supply Op Amp Design Techniques says

"Unless otherwise specified, all op amps circuits are single-supply circuits. The

single supply may be wired with the negative or positive lead connected to

ground, but as long as the supply polarity is correct, the wiring does not affect

circuit operation.

Use of a single-supply limits the polarity of the output voltage. When the supply

voltage (VCC) = 10 V, the output voltage is limited to the range 0 ≤ VOUT ≤ 10. This

limitation precludes negative output voltages when the circuit has a positive

supply voltage, but it does not preclude negative input voltages when the circuit

has a positive supply voltage. As long as the voltage on the op-amp input leads

does not become negative, the circuit can handle negative input voltages.

Beware of working with negative (positive) input voltages when the op amp is

powered from a positive (negative) supply because op-amp inputs are highly

susceptible to reverse voltage breakdown. Also, insure that all possible start-up

conditions do not reverse bias the op-amp inputs when the input and supply

voltage are opposite polarity."


So a 7918 negative regulator on the -24V supply should do it and just make sure the polarity is correct...


Cheers, V


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