PT2399 Echo Circuit Walk Through and Demo

The PT2399 Echo/Delay chip is good for Lo-Fi echo effects, but the chip datasheet doesn't give many insights into how it works and how to use it.
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Circuit analysis from ElectroSmash www.electrosma...
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[@Afrorack]

Good stuff

[@psy28core]

Wonderful circuit analysis! I want to know more... like how are you hooking up your mic and output to the breadboard? Is that other breadboard your 555 circuit? I'd love a close up or a combination build video. Thank you for this great vid.

[@gadgetsideload]

I can’t remember exactly how things were hooked up but glancing at what I see on the table, that other breadboard does look like it has the 555 with a variable duty cycle possibly as an audio test source.
The final audio output was that orange amplifier and I had a clip on microphone laying on the table to pick up the audio and record it on a zoom H1 which is sitting beside the orange amplifier. and the audio going to that orange amplifier is from the green cable with the black stripe and that’s going over to the breadboard with the echo circuit so it must be coming out of the actual Eco circuit directly.
I can’t seem to follow the cables for the other circuit board to the left of the battery pack it looks like the 555 audio is going on the green cable into that White circuit board and then there’s two outputs I think it’s a splitter to buffer that, but it looks like one of those cables doesn’t go anywhere and the other one is probably going to that black mixer
so maybe I was using the white board as a buffer or maybe I was trying something else and it didn’t work so the board just got left there because it wasn’t hurting anything.
so overall it looks like maybe the 555 oscillator is going into the black mixer and so is the talking microphone and then the output of the mixer somehow gets connected to the input of the echo circuit and then it goes to the orange amplifier and gets recorded by a clip on microphone.

[@psy28core]

@gadgetsideload wow thanks for your reply. I'm trying to hook my output to a scarlett solo interface as we speak. Wish me luck!

[@Pixelwaster]

In this little field of Poppies, Poppies, Poppies, Poppies, ..... Found several of these while attempting to inventory my junque (box?, room? area?) again. Or still for the last 20 years. it breeds.

[@gadgetsideload]

I just started officially sorting out my junk box that has been going for decades maybe over 30 years that’s my cut off for choosing to remember how long I have been hoarding parts. I have so many weird chips that I don’t even know anymore what they do and I’ve been googling them. It might lead to some interesting breadboard projects.

[@AmbroseAlberts]

I followed the PTC schematic before I found your video and I immediately get a 2.5V drop on my 5V rail after you connect it to the chip. Any ideas on what I’m doing wrong? Is it worth troubleshooting or should I just look into a chip analysis like you described here. Much appreciated!

[@gadgetsideload]

if the main voltage supply rail is being dragged down dramatically when something is connected it sounds like a short circuit or bad component drawing excessive current.

[@pileofstuff]

Looking forward to the inevitable guitar pedal implementation.

[@gadgetsideload]

The hardest part will be finding a way to tape down a guitar cable to the workbench without dragging a breadboard and everything else on the floor

[@Pixelwaster]

@@gadgetsideload Drywall screws.