klavis nodrain: negative to 5v adapter price : $26.00

reclaim your unused watts! did you know that typical 5v adapters draw 240% of the actual wattage they deliver, with 140% being wasted as heat? moreover they take it from your precious +12v rail.

beating even other switching-supply adapters, the nodrain converter takes its power where there is plenty unused: the -12v negative rail! you can safely assume that the current drawn on the 5v adapter will take half as much on the -12v rail. the nodrain adapter does its conversion with high efficiency. with 1 amp available, you can distribute the 5v from the nodrain to several busboards. thanks to ultra high-speed switching technique there is no noise to be heard.

just plug a nodrain in one of the connectors at the back of your rack and you're done.

features:
offers up to one amp of precise 5volts
takes its power from where you won't use it: the negative rail
gives you back the +12v power previously used to make 5v
high efficiency conversion: every milliamp delivered on the 5v rail only draws around half as much milliamps on the -12v rail
soft-start prevents current inrush at power-on
tolerates wide voltage variations of the -12v source
miniature module 20x28mm - 0.78x1.10"
adjustable output voltage - delivered calibrated

protected against:
current overload
input overvoltage
overheating
short-circuit
reverse insertion

download the users manual here.