IIRC, Line level means typical signal is 1v peak to peak, not to drop
below -1v or go above 1v (so you could do a 2v peak to peak centered at
0v) into a load.  I've seen loads of 10k, and some as low a 47ohms - I
don't know what 'standard' is.

You should be able to do a quick and dirty voltage divider.  Put a 390
ohm resistor at the output of the 555, then a 100ohm resistor from the
other side of the 390 to ground.  Then the junction of the two resisters
will be about 0-1v peak to peak.

Please be aware that a square wave sounds fairly harsh.

-Adam

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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