Hi,

Can you allow a small voltage drop ? If so, why not two diodes, one in =
series with the power supply and one with the battery.

Regards

Attila - SM4RAN


>Hello PicListians,
>
>       Does anyone know way to do a small battery backup for my
>project. I have +5V from 78L05 and I need backup when that power
>failed. Project is RTC without specialized RTC chip. Only 16F876
>running on 6.5536MHz. And please no answer that said 'Take RTC chip!'
>because project is budget limited!
>
>Thanx in advance
>
>--
> Branko
> branek@eunet.yu
> http://solair.eunet.yu/~branek
> ICQ: 15616778
>
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