Story
This is an Audio Tone Burst Generator that sends out periodic bursts of an audio tone. You can set the frequency of the tone in the burst and the time between bursts. There is a sync output for triggering an oscilloscope.
It is used for measuring the time delay in a piece of audio equipment. Modern audio equipment may use fancy digital processing which may introduce a noticeable delay in the sound. If you use your own sound system with your TV and the delay is too long you will notice that the actor's mouth movements are not synchronized with the sound coming out of it. This is very distracting.
It can also be used as a regular sine-wave generator and as a sweep generator.
With a separate program it can be used as a VCO.
The project uses a Raspberry Pi Pico, an Analog devices AD9833 sine wave generator, a 2x16 LCD display, and some pushbutton switches.
The power comes from the Pico's USB port. No other power is required.
The full description and documentation is on my Web site at https://www.jmargolin.com/pico-projects-e2/
