pt2399 Delay circuit – It works!!!

A couple of days ago, my pt2399 chips came in. Like I stated earlier, I got 10 of the chips for about 11 bucks on ebay. What a great deal!

After getting them I immediately went through the delay schematic that can be found in the datasheet for the pt2399. I wired it all up on the same bread board that had the wah wah circuit on it.

I had to grab a few parts from Rad Shack to get it all put together. One of the main things to think about is the need for only 5 volts. My bread board is wired (right now) for 9 volts. So I got a voltage regulator. Specifically, the 7805 5V voltage regulator from Radio Shack. It worked great. According to my multimeter, it puts out 4.98 volts.

I also couldn’t get a lot of the specific capacitor sizes, so I just used ones that were as close as I could get.

Of course, the first time I wired everything up it didn’t work. I have a tendency to go through it without checking my work for wrong wiring. After an hour or so of wiring and wondering, I put it to bed for the night.

I tried it again the next night and there was some delay. The potentiometers weren’t doing anything, which I thought was very odd. Then, I looked over at my guitar pedal board and saw that I still had my digital delay on. That was what was causing the delay, not the one I had just put together. I was so pissed at myself.

I went through the schematic again and found a ton of errors. All kinds of capacitors and resistors were in the wrong place. Wires were connected to empty rows on the bread board… it was a mess.

Now, she is all cleaned up (so to speak) and running perfectly. Check out the video.

The chip gets a little overloaded when you make the number of repeats too much. The echoes get louder and louder and drown out the original sound. Then it makes a weird noise and doesn’t work quite right until you turn everything off and unplug everything. 20 minutes later she works fine again.

I think I will shrink the size of the potentiometer that controls the number of echoes.

The other potentiometer is perfect. I might try a larger one to see if the delay time can be extended but other than that… it’s AWESOME!!!

Hope you like it and I suggest you try one of your own. It’s lots of fun. I have always wanted a second delay pedal.


PT2399 – Echo – Delay

So far, every time I test an audio circuit I have been running it through my guitar amp and pedal board. I have some effects pedals that make everything sound AMAZING. It doesn’t matter if it’s just obnoxious noise or beeps, bops, bleeps and boops or what. It all sounds great.

I have a Boss delay pedal and an Ibanez chorus pedal, wah pedal, distortion… amongst others.

The key is the delay pedal. No matter the input is, the delay pedal creates a rhythmic pulsing that is just heavenly.

So, I wanted to add an echo/delay effect to all the stuff I do from now on. It just seems like the right thing to do. I won’t always have a delay pedal and amp to process the sounds so, naturally, integrating one into the circuit is a must.

PT2399 Echo/Delay Audio Processor IC

Enter the PT2399. I found a delay IC that you can get for relativly cheap on Ebay (10 chips for $11 and free shipping from the seller “connectors_usa”

Below is the datasheet and pinout info.  The PDF lists the application of the delay circuit which I have included a pic of.

PT2399 – Pinout and Datasheet

You can find the Datasheet and pinout information at…

PT2399 – Echo Application Circuit

You can find the entire PDF here…

I’m gonna order a batch and try and rig up a delay circuit. I will of course write about the process and let everyone know how it went.