Voltage Questions...

[Submit]

Some time back I bought this temp monitor. Since I have replaced both batteries twice. The batteries are 1.5volt. Anyone have any ideas on how I can solder some wires to the battery contacts on the temp monitors and also how to lower the voltage ??

TIA

 

[Evadman]

If you split one of the orange wires on the ATX connector, and wire those 2 sensors in series, you can forget the batteries. The problem is the contacts in those are SMALL. I know because I have the exact smae thing, and thought the exact same thing. I have not done it yet though.

Doing this will give each sensor 1.65 volts.

 

[Submit]

Can you give more info on how to wire both sensors in series???

 

[Evadman]

ummm....

Power supply ------- + (Senser 1) - ---------------- + (sensor 2) - -------------- Ground.

orange wire to positive of one sensor. Then the negitive from that sensor goes to the positive on the second sensor. Then the negitive on that sensor is attached to ground.

 

[dighn]

to wire them in series:

u have 2 sensors, a & b
connect a's negative to b's postive

then apply power to a's postive and b's negative

i dont know how well that work though. perosnally i'd buy a voltage regulator chip from digikey or an lm317 variable regulator from any electronics store and hook it up to give 1.5 volts or 3 volts

 

[Submit]

Thanks for the responses.

Originally posted by: Evadman
ummm....

Power supply ------- + (Senser 1) - ---------------- + (sensor 2) - -------------- Ground.

orange wire to positive of one sensor. Then the negitive from that sensor goes to the positive on the second sensor. Then the negitive on that sensor is attached to ground.

Evadman, Do you plan on trying this out some time soon?

 

[Evadman]

yes, but sometime soon to me means sometime this year. I was going to do it 6 months ago when I got it because it was missing a battery. I just got lazy and installed it without it since I really got it for moutning 2 80mm fans on a 15,000 RPM drive.

 

[Colt45]

the batteries in series i take it?

just take the 5v rail and hook it up to either end. on one side of the 5v rail put 3x silicon diodes (diode drop of each = ~0.7v, total 2.1v = 2.9v.. close enough to 3v which is 2x 1.5 battery in series..)



edit: if the two temp sensors are completely seperate as far as power supply (aka battery) goes, just use a 1.5v zener

 

[Submit]

I think I will get around to trying it before you do then 🙂

Originally posted by: Evadman
If you split one of the orange wires on the ATX connector, and wire those 2 sensors in series, you can forget the batteries. The problem is the contacts in those are SMALL. I know because I have the exact smae thing, and thought the exact same thing. I have not done it yet though.

Doing this will give each sensor 1.65 volts.

Will splicing into one of the orange wires lower its voltage and could it have any negative side effects?