Dear All:
I have water meter which use 3.6v AA battery as below:
Nominal Voltage: 3.6V
•Battery Type: Li-SOCl2 Battery
•Size: AA
•Item No.: Er14505
•Nominal Capacity: 2700mAh
•Work Current: 100mA
•Pulse Current: 200mA
•Model Size: 14.5*50.5mm
Can I Have power adapter which convert from 220v to 3.6v 2700mAH to use it instead of using batteries?
Regards....
Power supply are not rated in maH, that is only for the battery and indicate the power reserve that battery can store. In your case you need a PS capable of 200 mA at 3.6 volt, if you have problem finding one you can use a normal telephone charger rated at 5 V with a couple of diode in series to drop voltage down to 3.6 V.
Ciao, Ale.
You can use a wall adapter that supply 5v. Then use a voltage regulator like this, it's a 3.3v regualtor. Try to find a 3.6v regulator.
You can go with both suggested solutions.
- Solution in reply#1 - make sure that you go with diodes that can carry the current (e.g. 1N4001 or equivalent)
- Solution in reply#2 - sometimes a little challenging to find 3.6V regulators (but they ARE available)
There are some more solutions possible:
- adjustable regulator like LM317
- transistor with zener diode
- plus the ones I forgot
The easiest solution might be the solution with the diodes.
Things that use the lithium thionyl chloride batteries usually run at very low power with years between battery changes. (The 100mA, 200mA max current specs are for the battery not necessarily the device - I suspect the actual current is much, much lower than that. So the stacked diodes may not work (at low current, the voltage drop over a diode is lower) - you need to make sure your power source actually provides acceptable regulation under very low current conditions.
That said, since the battery life is probably quite long (particularly since OP describes it as a water meter, which sounds very low current to me ) , I'd be really tempted to just feed it a new battery every few years.