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  1. J

    LM317 Variable power supply

    Initial Current
  2. J

    LM317 Variable power supply

    Just a few more questions: The supply is 18V, the batts spesifies less than 1.20A and say the sermons lasts at most 2 hours the resistor will be 30 ohms, correct? If the batts specify 6V4.0AH/20HR each how quickly will the batteries run down by the laptop? What are the risks, if any with the...
  3. J

    LM317 Variable power supply

    Like this then? What should the value be of the resistor, is 1k fine?
  4. J

    LM317 Variable power supply

    Hi, I am building a power pack for a laptop... reason being we make recordings on the laptop of sermons, but the power in the building where it is done is very "Noisy"? resulting in terrible recordings. What we did was using a 6V and 12V car battery in series, connecting the original power to...
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