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=Variable gain stage=
The gain stage amplifies the output of the sinewave generator. The output of the AD9833 is capacitively coupled to the input of the [http://www.ti.com/product/TL081 TL081], a general purpose op-amp. The TL081 is configured with a potentiometer to allow the gain of the amplifier to be adjusted.
[[File:Noninverting.png|400px]]
<math>R1</math> and <math>R2</math> form the feedback resistor network which controls the gain of the amplifier. The voltage gain is calculated using the following formula:
