9V NiCad Battery back-up/Charger circuit needed
9V NiCad Battery back-up/Charger circuit needed
(OP)
I need a simple, CHEAP circuit to sense input power between
0 and 22VAC and if input power is less than 10VAC switch over to the battery. The circuit also needs to keep the battery charged when input power is available.
0 and 22VAC and if input power is less than 10VAC switch over to the battery. The circuit also needs to keep the battery charged when input power is available.





RE: 9V NiCad Battery back-up/Charger circuit needed
However, before you can design the circuit you need to define the acceptable range for the "9V" output and the load current, what kind of battery you are using and what its actual on-charge voltage needs to be.