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  1. A

    Delay Relay

    What would be the right sort of relay to delay turning on a circuit for a couple of seconds? would I be better off with a 555?
  2. A

    Raspberry Pi

    I recently purchased a raspberry pi computer and I've thought about trying to make it mobile by using a battery pack etc. does anybody know the current requirements for it?
  3. A

    automatic switch

    please could you help? i need a circuit that will block voltage lower than 5V is there a specific component for this or will i need to build a sub-circuit? [/SIZE][/SIZE]
  4. A

    automatic switch

    Is it possible to buy or build a switch that will turn on a switch automatically when it reaches 5V?
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