Klavis NoDrain – Assembled +5V Source

£17.00 (Excl. VAT)

Negative to +5V converter  – Add +5V supply to any busboard without draining your precious +12v bus!

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Note: this is not a kit – PCB comes pre-assembled

The Klavis NoDrain adapter is intended for Eurorack cases lacking a dedicated 5 volts supply. It draws its power from the negative 12 volts rail – 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 from where there is plenty unused: the 12V negative rail. You can safely assume that the current taken on the 5V is always divided by two to know the current taken 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.

Klavis NoDrain – User Manual


  • 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
  • Dimensions: 20x28mm – 0.78×1.10″
  • Adjustable output voltage – delivered calibrated
  • Protected against:
    • Current overload
    • Input overvoltage
    • Overheating
    • Short-circuit
    • Reverse insertion

Additional information

Weight 0.016 kg

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