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Message: <blockquote data-quote="Disco Volante" data-source="post: 1150198" data-attributes="member: 125755">A bit of reading later:TI Single Supply Op Amp Design Techniques says"Unless otherwise specified, all op amps circuits are single-supply circuits. Thesingle supply may be wired with the negative or positive lead connected toground, but as long as the supply polarity is correct, the wiring does not affectcircuit operation.Use of a single-supply limits the polarity of the output voltage. When the supplyvoltage (VCC) = 10 V, the output voltage is limited to the range 0 ≤ VOUT ≤ 10. Thislimitation precludes negative output voltages when the circuit has a positivesupply voltage, but it does not preclude negative input voltages when the circuithas a positive supply voltage. As long as the voltage on the op-amp input leadsdoes not become negative, the circuit can handle negative input voltages.Beware of working with negative (positive) input voltages when the op amp ispowered from a positive (negative) supply because op-amp inputs are highlysusceptible to reverse voltage breakdown. Also, insure that all possible start-upconditions do not reverse bias the op-amp inputs when the input and supplyvoltage 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</blockquote>