I have an older water controller for a sprinkler system. It's working voltage is 24vAC that is quite normal and common. The electronics portion has a 9v (DC) battery supply that keeps it's memory and program intact during a power failure.
Most of our power failures are nothing more than a momentary bump whose duration lasts from less than a second to less than a few minuets. Without the 9v supply, the memory is lost.
I usually don't realize that battery is dead until it's too late and the memory is gone.
Since it is older, the programing is more difficult than the newer versions. It's a pain to reprogram.
I would like to build some sort of a replacement supply for the battery that would last for a few minuets of power failure. One that is powered off of the 24 v main supply. Something that would replace the battery for those short intervals of power loss.
I would imagine that the electronics would work with voltages from 6v to 12v. The controller can't be that picky to require a constant 9v.
I'm not an Electronic engineer, but I do understand circuits, especially if they are explained.
If anyone has some simple ideas or circuits, I would really like to give them a try.
Thanks Rex
Most of our power failures are nothing more than a momentary bump whose duration lasts from less than a second to less than a few minuets. Without the 9v supply, the memory is lost.
I usually don't realize that battery is dead until it's too late and the memory is gone.
Since it is older, the programing is more difficult than the newer versions. It's a pain to reprogram.
I would like to build some sort of a replacement supply for the battery that would last for a few minuets of power failure. One that is powered off of the 24 v main supply. Something that would replace the battery for those short intervals of power loss.
I would imagine that the electronics would work with voltages from 6v to 12v. The controller can't be that picky to require a constant 9v.
I'm not an Electronic engineer, but I do understand circuits, especially if they are explained.
If anyone has some simple ideas or circuits, I would really like to give them a try.
Thanks Rex