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There's a trick to using this, if you look at it's pinout (front facing you, pins pointing down), input is in the middle, ground is on the left, if you connect input to the battery's negative, and ground to the battery's positive (pretending it was a normal everyday positive regulator), you make the input negative. BUT don't connect the ground pin to the ground of the circuit, connect the battery's negative to ground as usual.
Frank26080115, have You tested this schematic? It looks a little strange- You step-up voltage with only linear circuits ( no switching), getting 30 Volts from 24. Linear cirquit make voltage only less, no more. And Proteus tells the same.Steve Joblin: how many current your device consume from -15 V? And how stable voltage should be? If You are not using prescision components there, and consumption is low (5 mA) You can use switching capacitors inverter ( for example 2 LMC7660), or something like ADP1111 fore more current.
Quote from: sirnails on October 24, 2011, 05:49:34 AMAnother Idea;Improved:any comments, suggestions, criticisms?