Building Blocks: 15KHz standalone sine wave generator

A project log for A Versatile Labtool

A cost effective, multi-pronged data acquisition tool to turn your computer into a workbench for science and electronics experiments.

JithinJithin 08/01/2015 at 19:490 Comments

In an effort to keep costs low, the vLabtool only has one high resolution DDS sine wave generator incorporated onto the base board. However, certain electronics experiments(such as Amplitude modulation) require two waveforms.

Therefore, a fixed frequency quadrature oscillator was added at the cost of an op-amp and a few passive components. The output waveform is bipolar, with a fixed amplitude.

This fairly common circuit generates a sine wave and a cosine at the same frequency. D4,D5 are 4v7 zener diodes.