Reduce 12volts to 1.5v ??

Submitted: Thursday, Aug 15, 2002 at 00:00
ThreadID: 1732 Views:3822 Replies:6 FollowUps:1
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I want to fit a thermometer to my 12v fridge. I have a battery operated panel display with probe type thermometer. The battery is a 1.5 volt button type. I would like to remove the battery and run power from the fridge motor to the thermometer but need to reduce it from 12v to 1.5v. Anyone know how to do this, maybe using diodes or something? Any electronic wizards out there who could tell me how? TIA
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Reply By: RALPH - Thursday, Aug 15, 2002 at 00:00

Thursday, Aug 15, 2002 at 00:00
a 1.5v regulator 12v in , centre pin earth , 1.5v out probalby a 1 amp regulator will dobleepSMITH , TANDY, RADIO SPARES, SHOULD HAVE THIS DEVICE
AnswerID: 5741

Reply By: Mark - Thursday, Aug 15, 2002 at 00:00

Thursday, Aug 15, 2002 at 00:00
Tony,
I have exactly the same in mind and as Ralph mentioned I bought a 12/24v to 1.5vdc adapter frombleepSmiths.The adapter is a Ciq plug style and I pulled it apart to remove the circuit board which incorporates a voltage regulator (make sure you get a regulated one) I have not got around to fitting it yet but for around $10 this is probably the best option.
The adapter I have is made by SCI and has part no: AI3-55E I tested it by varying the input voltage and the output remained constant at 1.5vdc.
AnswerID: 5744

Reply By: Sean - Thursday, Aug 15, 2002 at 00:00

Thursday, Aug 15, 2002 at 00:00
Tony I use a solar powered thermometer on my Fridge a lot less hassle and if you need to read it at night shine the torch on it for 30 seconds and you have the temperature. A lot less hassle and it is permantly attached.
AnswerID: 5745

Reply By: Member - Nigel - Thursday, Aug 15, 2002 at 00:00

Thursday, Aug 15, 2002 at 00:00
For such a low current draw, I'd use a zener diode as a regulator.
AnswerID: 5746

Reply By: Bob - Thursday, Aug 15, 2002 at 00:00

Thursday, Aug 15, 2002 at 00:00
Tony - always keep a can in your fridge - if it's cold enough to drink the fridge will be working!!
AnswerID: 5751

Follow Up By: Andrew D - Saturday, Aug 17, 2002 at 00:00

Saturday, Aug 17, 2002 at 00:00
Bob, what happened to the rest of the cans. Did you drink them checking the temp?
I like your methods.
Andrew
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FollowupID: 2507

Reply By: Fred - Friday, Aug 16, 2002 at 00:00

Friday, Aug 16, 2002 at 00:00
Tony you can get thermometers that don't require electricity!!
AnswerID: 5764

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