Here are some new pictures from a breadboarded PT2399 circuit I have been using to experiment with.
Get yourself a PT2399 datasheet, buy your components, and start getting down with some delay!
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A nice shot of the breadboard I have been using to mess around with the PT2399![/caption] [caption id=“attachment_549” align=“aligncenter” width=“650”]
The switch, voltage regulator, power supply capacitors, and some hookup leads. This is pretty much a standard way of getting a steady regulated 5V from a higher voltage. Fun, fun![/caption] [caption id=“attachment_550” align=“aligncenter” width=“650”]
Just a standard 9V Battery powers this 5V circuit. All you need is a 7805 regulator and you can start messing around with CMOS devices such as the PT2399![/caption] [caption id=“attachment_548” align=“aligncenter” width=“650”]
A simple LED/resistor combo to indicate when the power is ON or OFF. It’s a good setup to use to troubleshoot your circuit and avoid drained batteries.[/caption] [caption id=“attachment_552” align=“aligncenter” width=“650”]
Connecting power rails on different sections of the breadboard lets you space out your design for easier testing![/caption] [caption id=“attachment_547” align=“aligncenter” width=“650”]
Trimpots are used like multiple variables in algebra. I got a good grip on how the PT2399 reacted by messing around with the controls.[/caption] [caption id=“attachment_551” align=“aligncenter” width=“650”]
This is the section of the breadboard where the input and output audio are located. This could be improved…[/caption] [caption id=“attachment_554” align=“aligncenter” width=“650”]
Another shot of the PT2399 Echo Processor Digital Delay IC. It’s fairly easy to set up![/caption] [caption id=“attachment_558” align=“aligncenter” width=“650”]
The very cramped op amp filtering components can be laid out with a little bit of careful planning.[/caption] [caption id=“attachment_557” align=“aligncenter” width=“650”]
A little experiment! By messing with the Vref and the GND levels, the digital clock output (visible with an LED/resistor combo) can be slowed to a crawl. The resulting audio output gives clues on how to best utilize this chip![/caption] [caption id=“attachment_556” align=“aligncenter” width=“650”]
Just a nice overhead shot of the main schematic.[/caption] [caption id=“attachment_553” align=“aligncenter” width=“650”]
The Mix, Feedback, and Voltage Reference trim potentiometers used for tweaking the output! Cool stuff, try it out![/caption] [caption id=“attachment_555” align=“aligncenter” width=“650”]
Reference Voltage and Delay Length trimpots for experimenting.[/caption]