The following discussion explains the application details for the proposed LED relay changeover emergency lamp circuit
I am trying to make very simple changeover circuit.. where I
am using a 12-0-12 Transformer to charge a 12v Motorcycle battery via
mains.. when the mains go off the battery will power a 10w LED. But, the
problem is the relay is not switching off, when the mains goes down..
Any ideas. Want to keep it really simple..
12VDC Relay / 2200uf-50v cap on Transformer.
Hi, make sure that the relay coil
is connected with the rectified DC from the 12-0-12 transformer. The
relay contacts should be only wired with the battery and the LED
Firstly Thanks for the Reply.
1. Yes the Relay Coil is connected with the Rectified DC.
2. If I connect the relay contacts to Battery / LED only, then how will the Battery get charged when Mains is ON?
If i am not missing anything..
The above circuit is self explanatory and shows the configuration for implementing a simple LED relay changeover emergency lamp circuit.