The apparatus 3, wherein the means for coupling comprises a drive transistor, the drive transistor having a control terminal, an input terminal and an output terminal, {HEAD ~ the control terminal} of the drive transistor being connected to {TAIL ~ the output terminal} of the operational amplifier and the output terminal of the drive transistor being coupled to the control terminal of the pass transistor to drive the pass transistor in response to a signal present at the noninverting input of the operational amplifier 
The apparatus 3 , wherein the means for coupling comprises a drive transistor , the drive transistor having a control terminal , an input terminal and an output terminal , { HEAD ~ the control terminal } of the drive transistor being connected to { TAIL ~ the output terminal } of the operational amplifier and the output terminal of the drive transistor being coupled to the control terminal of the pass transistor to drive the pass transistor in response to a signal present at the noninverting input of the operational amplifier
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