Line level is a relative term in a lot of hi-fi specs. Typically it is an
unbalanced, -10db at 10k for a 0db reference. Some specs vary from that level.

Conversion is not critical. Your 555 is outputting more than the above level.
Just pad it with a voltage divider resistor network. You will have to
experiment with the values. As long as nothing else is tied to the line input,
you might just get away with a series resistor from the 555 output to the line
in. If you want to get technical, use a t-pad with all three resistors at 10k,
and if the level is too high, the input resistor from the 555 can be
increased.
Rick

"Hulatt, Jon" wrote:

> Hi,
>
> I want to interface to a Hi-Fi type Amplified, which has a regular line
> level input. But I'm having great difficulty in finding out what exactly
> "line" meaans. There's a lot of conflicting information out there.
>
> Second question, derived from the first... Given an astable 555 outputting
> about 1.3 KHz, close to 50% DC, and 0-5v Pk2Pk, how can I convert this to
> "line level" ?
>
> Thanks
>
> Jon
>
> --

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