![]() ![]() NOTE: if you remove the LED, this thing is VERY LOUD. ![]() Very frustrating but I promise you the circuit works and it’s super fun. I know, it sounds weird, but trust me, it works because I pulled this whole thing apart to clean it and it didn’t work until I made those changes. The POSITIVE of the OUTPUT socket goes to pin 14, and then the other wire is put into the GND of the board. PT2399 Echo/Delay Homemade Guitar Preamp LukeZ1986 10 subscribers Subscribe 3 218 views 3 years ago I have a homemade PT2399-based echo amp that I made for my guitar. Digital Delay/Echo IC for building quite simple designs Maximal Delay tine 324ms Recomended socket: 16 pin DIP All PT2399 are tested on functionality an. So, you need to make the POSITIVE of the INPUT socket go parallel to the 4.7k resistor, as in the diagram, but make sure it’s the POSITIVE part of the socket that goes there. Remember, your audio in and outputs have a GND connection on them, on the socket and on the wire itself. The diagram is correct I promise, BUT, If you’ve wired everything correctly, and it still doesn’t turn on, most likely it is because the input and output connections are not grounded correctly. UPDATE!!! JAN 22ND 2013 – – Thanks to Oskar for notifying me of this issue. So there’s not much room in the wet/dry for variation - feel free to tweak this as you like. Now you can adjust the wet/dry as you like, but after a certain point the entire sound output will disappear. The trick in my design is using a much larger cap (.47 uF instead of. 7sec repeats with little noise and I don't need a compander I did some different things than the standard circuits out there. To make it work well, I always turn the POTS all the way on the same direction, you should hear the time signature (going very fast like a growl) even if there is no input signal. I am posting a schematic of my approach to using the PT2399 for a delay. 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). So, I made my own schematic based on what I got out of it, hope it works for you too. The PT2399 is one of the most rewarding chips a DIYer can experiment with. doesn’t have the schematic, but I looked at the images and was able to piece this together and get it to work. This circuit is very dirty - DIRRRRRRTY and it’s great! Incredibly simple, just a few parts. ![]()
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