electronic people
22-04-2007, 06:14 PM
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i have a 12v dc supply, i need to power a 5vdc gauge that draws 50ma. Can i just put s resistor in seriours to lower the voltage or will this only lower the current that flows? steve
22-04-2007, 06:23 PM
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I wouldnt recomend just a resistor as if the load current changes the
voltage will change and cause you problems.
You need a 7805 regulator chip.
Easy to wire up, and cheap. Postage will cost you more....
Try this link
http://uk.farnell.com/jsp/Semiconduc...sp?sku=1013817
voltage will change and cause you problems.
You need a 7805 regulator chip.
Easy to wire up, and cheap. Postage will cost you more....
Try this link
http://uk.farnell.com/jsp/Semiconduc...sp?sku=1013817
24-04-2007, 08:54 PM
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i got a few of these chips today, now looking from the front with the heatsink to the rear, i believe from the left pin to the right it is.
voltage in - ground - 5v output.
is this correct?
will i need to add an additional heatsink for my 50mA current draw? And do i need to use any other parts in the circuit?
cheers Steve
voltage in - ground - 5v output.
is this correct?
will i need to add an additional heatsink for my 50mA current draw? And do i need to use any other parts in the circuit?
cheers Steve
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