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deepzac
03-19-2013, 11:38 PM
hi friends Im new to this forum
and i would like help regarding how to use a battery supply in case of power failure for a circuit using a single channel relay switch.

vikas
03-20-2013, 02:32 AM
Why do you want to use a relay , simplest would be use 2 diodes that should do. There are more complicated approaches also but this should do . Relay would lead to a circuit reset and i would not recommend it.

http://www.qsl.net/k/kb8mfv/images/Battery%20backup%20schematic.gif

deepzac
03-20-2013, 08:23 PM
Thank you Vikas, But i need to connect this circuit to an an encoder HT640. So how do i go about it :(

GayleShier
02-07-2014, 01:59 PM
there is nothing on this ^^
i just want to know if any has got it then please share