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.