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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

http://www.schematic-diagram.com/tone-generator.html

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Welcome to ETO, umber!
What kind of details are you looking for?
If I were you, I would use a 555 timer instead. It's a lot simpler and easier to understand.
Der Strom
 
It is a supposed to be a rudimentary multivibrator based on an OpAmp used as a comparator. It has many errors in it that will prevent it from working.
Very poorly conceived by a rank amateur.
 
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