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will12 volt dc appliance work with 19 volt dc supply Answered

I'm wondering if I can run a 12 volt DC thermoelectric cooler with a 19 volt power supply from an old laptop

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iceng

1 year ago

You could run it from a NEW power supply that can deliver a smooth 12VDC...

19V will destroy your cooler, Although it was probably made for a car and as such it may tolerate as much as 15VDC continuously... The 1N4001 diode drops o.65VDC..

19-15=4 Volts too much.. If you put seven diodes in series the 19V will be lowered to 14.53VDC and if the cooler draws one ampere or less...

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seandogue

1 year ago

in most cases, no. rarely, a device has a wide input voltage acceptance range, but most times plugging 19VDc into a 12VDc device will result in

a) blown input stages on device.

b) blown output stage on power supply.

c) both.

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seandogueseandogue

Answer 1 year ago

and specifically, for the peltier cell, that all depends on the specs for the part. higher voltage means higher current and they have a finite current carry capability...pOof!

Consult tech spec sheets or the mfg of said peltier.