Circuit diagram for "Auto Sweeping" square wave generator

[DM999]

Can some you help me to find a circuit diagram for "Auto Sweeping" square wave generator?

need to auto sweep 20-20KHz in a loop.

Many thanks

PW

 

[PH104]

Pat

I just posted a reply to this in DIY section of Audio Asylum.

Phil

 

[DM999]

I still have problem with the "auto sweeping" part, what's the simpliest to do it? Any circuit diagram available?

Many thanks.