Re: Hz overload

"steve" <kvsteve@[EMAIL PROTECTED]
> wrote in message 
news:03b46771-e8ad-45bf-8bf9-7fdf483a12cf@[EMAIL PROTECTED]
 the 9v battery supply is quickly used up, I am using a ac
battery eliminator/wall wart to run the Led timer.

Although the eliminator provides the needed 12v to 15 v, it also
changes the 50 hz dramatically to several khz.

The khz output from the eliminator completely upsets the 555 timer
input, so there is no timing available from with the circuit.

I tried a 1000uF with several diodes placed at the eliminator’s
output, but there is hardly any production of dc.

Thanks.

Steve.

Sounds like you are using a switching supply.
The wall wart is not filtered very well.
Also your project didn't address noise on the DC supply.
I would suggest non-switching wall wart and clean up the output.
I would also look into your design since it wasn't expecting noise from a 
battery.

Tom