JuniorHP

Initial Current

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 way we want to use this?

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

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 the batteries and getting perfect(clean DC) power into the laptop, which results in beautiful recordings. This is a temporary solution. I am planning to use 3x 6V batteries in series, a few diodes and the input and output connectors. I have attached a picture of a drawing i planned, this may be incorrect in which case please let me know. I am open for any suggestions.