I have the need to build a basic UPS.
I have found a circuit that is basically what i want and i will modify it to suit my additional needs.
**broken link removed**
I will be changing the transformer to a secondary winding giving 18v.
The battery will be a 15v NiMH Pack.
How do i calculate the resistor required to trickle charge this battery???
I dont anticipate the power to constantly trip out (once ever 6 months or so maybe) so it doesnt matter how long it takes to recharge the battery.
After the battery, there will be a 12v and a 5v regulator, 12v outputs and 5v outputs.
When mains power is lost i still want both 12v and 5v power outputs.
From what i can find this is the simplest way of doing this, is there any better way??
Also if any of you guys know anything about switching power supplies i would like to hear your thoughts, the transformer i plan to use is huge delivering just over 1 amp, even then with everything on this will be almost at its limit. Could a Switching power supply be made fairly easy handling more than 1 amp???
I have found a circuit that is basically what i want and i will modify it to suit my additional needs.
**broken link removed**
I will be changing the transformer to a secondary winding giving 18v.
The battery will be a 15v NiMH Pack.
How do i calculate the resistor required to trickle charge this battery???
I dont anticipate the power to constantly trip out (once ever 6 months or so maybe) so it doesnt matter how long it takes to recharge the battery.
After the battery, there will be a 12v and a 5v regulator, 12v outputs and 5v outputs.
When mains power is lost i still want both 12v and 5v power outputs.
From what i can find this is the simplest way of doing this, is there any better way??
Also if any of you guys know anything about switching power supplies i would like to hear your thoughts, the transformer i plan to use is huge delivering just over 1 amp, even then with everything on this will be almost at its limit. Could a Switching power supply be made fairly easy handling more than 1 amp???