This circuit provides a sinusoidal sidetone oscillator for the Pixie. As an added benefit, it will also cause reduced broadcast interference, since the muting circuit of the Pixie is a major source of broadcast interference as the LM386 goes into some sort of nonlinear mode and acts as an old-fashioned crystal detector.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgw9jTIvBYHUeJyw3bcKyrcnYka6aacBDapOvYSYBr6JcIAydMQaBEwm9tGv8nDlS-nd7fEv1q_9e4aJxpvimh-01tlS2rvayYunWbnXL1z9uAzEH4CwKYE9dMdbLCQpe47NjNQFm7Nlg4/s400/PixieSidetone.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgw9jTIvBYHUeJyw3bcKyrcnYka6aacBDapOvYSYBr6JcIAydMQaBEwm9tGv8nDlS-nd7fEv1q_9e4aJxpvimh-01tlS2rvayYunWbnXL1z9uAzEH4CwKYE9dMdbLCQpe47NjNQFm7Nlg4/s400/PixieSidetone.jpg)