Hi,
I have a bus I am converting and want my 12v lead acid battery to be a backup in case my AC/DC supply fails. So I am using the same circuit but different input sources. The load isn't much, just a car audio system and a few led lights. Now I understand I will need to protect the sources and have found a circuit which suggests a 27 ohm resistor in parallel with a 1n5400 diode. I've tried this but voltage isn't being blocked. (Yes, it is inserted correctly). I would guess I should put the resistor in series, but is the value correct?
I have a bus I am converting and want my 12v lead acid battery to be a backup in case my AC/DC supply fails. So I am using the same circuit but different input sources. The load isn't much, just a car audio system and a few led lights. Now I understand I will need to protect the sources and have found a circuit which suggests a 27 ohm resistor in parallel with a 1n5400 diode. I've tried this but voltage isn't being blocked. (Yes, it is inserted correctly). I would guess I should put the resistor in series, but is the value correct?