No it is NOT possible to damage a circuit by applying a lower voltage. 
What could happen is that you switched the wires and apply -3.5V and 
THAT could damage the circuits!

Reinder


On 9-1-2005 6:25, Tom H wrote:
> Is it possible to fry a circuit designed for 5v by applying 3.5v?  I 
> wouldn't think so, but then I'm not an expert.
> 
> "Blaze" <asfdaf@aff.com> wrote in message 
> news:QyqDd.84$7D2.24@newsfe6-gui.ntli.net...
> 
>>Hi
>>
>>I have a Finepix F410 and I was using a car generic charger set at 3.5 v
>>
>>The camera charged for the first day and was full.. on the second day the 
>>charger smaoked a bit and when I tried to start the camera it does not 
>>work...
>>
>>the settings on the charger were always at 3.5 V..
>>
>>Any Idea to whats happened and how to fix the problem as its my sisiters 
>>camera...
>>Thanks
>>
> 
> 
>