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0.5V Negative Supply

2015-03-18 10:37  
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0.5V Negative Supply
Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power ?rail to rail? op amp circuits, which need to have a true zero volts output. Source: discovercircuits