sinewave generator

In last month`s issue of Elektor we published a design for a spot sinewave generator which offered truly `top-notch` specifications. For the purposes of many amateurs, however, the accuracy provided by such a circuit (e.g. harmonic distortion of less than 0.0025%) is an expensive luxury. The circuit described here represents the other side of the coin -a simple cost-effective sinewave generator whose frequency can be continuously varied over virtually the entire audio spectrum, while being easy to construct and requiring no calibration. Just for good measure the circuit also offers the choice of a squarewave output