The PT2399 is one of the most rewarding chips a DIYer can experiment with. A stock circuit from the datasheet can nearly complete a guitar pedal project, and there are load of other applications for projects that require an analog-sounding digital delay (more on this later). For you circuit tweakers out there, I will include a Mods section to get you going in the right direction. First off, let’s take a look at the datasheet to learn more about the PT2399. PT2399 Datasheet Always get a datasheet for any unfamiliar components before you do any circuit work! You don’t want to destroy your part before you get a chance to hear it! Princeton, the company that manufacturers the PT2399 Echo Audio Processor IC, made a great datasheet to accompany their product. Unfortunately, the full version is hard to find amongst the most popular Google results for “PT2399 datasheet”; an abridged version that edits out the good and useful parts is abundant. Throughout this page, I will use snippets from the full datasheet to explain some of the results of my experience with the PT2399. You can download the full datasheet below: PT2399 Features I’m not going to repeat the datasheet description/marketing here. What I will do is try and express how the PT2399 actually sounds. The PT2399 has a lot of unique features. It’s a digital delay that mimics analog delays quite well, giving a warm bassy filter to the overall delay repeats. This is no accident, as the PT2399 has a lot of high-frequency digital noise that has a way of getting into the audio path and is tamed through filtering courtesy of the on-chip op amps. If you use the PT2399 Echo Application’s Pin 6 resistor-potentiometer configuration. PT2399 Pin 6 Potentiometer Resistor you’ll notice that the input signal will modulate in pitch as you sweep the potentiometer. Whenever I see potentiometers, I think modification. See the Mods section later in this guide for some of the ideas you can try out! “PT2399 boast of very low distortion (THD. PT2399 Surround Delay Application Circuit These are very good places to start. ![]() Nikkodo Digital Echo Processor with Digital Key Controller (Model DEP-2000K) By admin| December 24, 2018 Just in time for the holidays, here is a Nikkodo Microphone Digital Echo Processor (Model: DEP-2000K); in EXCELLENT working condition! Echo, Delay, and Repeat dials. I prefer to build unfamiliar circuits piece by piece and bring them together once they are functioning correctly. Build a simple PT2399 circuit, test it, and integrate it with your next stage of development. Advanced Schematics Several great schematics are available online. Many of them have modifications that rival professional circuits, so you’re not going to get a hodgepodge of iffy designs. • – Valve Wizard did his homework when designing his PT2399 circuit. His insightful accompaniment to the Princeton datasheet and example circuit will shave off a couple of hours of frustration when you’re looking to tweak your circuits. • – If you were ever wondering what the design process looks and feels like, look no further. This 60+ page thread on the phenomenal DIY guitar pedal message board is a textbook example of what it takes to deal with a lot of issues on the way to perfection. The Echo Base PT2399-based circuit incorporates an LFO (low frequency oscillator) for delay length modulation as well as some other nifty features. • I’ll be adding my own buffered guitar pedal with an in-depth analysis soon!
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