Dub Delay / Pocket Mixer in a Vintage Tin
Channel: Greasy Conversation
Date: 2020-06-18

Previously containing #1983 #Vegas Playing Cards, re my birthday and my town. This delay uses the classic #PT2399 #delay chip made for karaoke machine #reverb . It’s also used in many famous guitar delay pedals. It’s early-digital with a bucket-brigade style sound and analog-esque realtime pitch changes. I purchased a prebuilt board with this chip on ebay, then did some mods. Here’s what I bent:
The resistor was removed between pin 6 and ground.
For the delay time knob, a 50k linear pot was added between pin 6 and ground, with a 68k resistor in series, and a switch that bypasses this resistor. (it just connects both sides of the resistor together) Ground connects to the right pin of the pot (knob facing you) and the middle pin goes toward pin 6 (with the resistor & switch in series on the way to it.)
Bypassed the unknown resistor nearest the wiper (center) of the included feedback/blend pot.Added a 10K resistor in it’s place, on the way to the pot center pin.
Added a button that connects the chip’s pin 10 and pin 13 together only when pressed.
Removed and bypassed the 7805 5V regulator. Powered it from 5V USB. Keep that fella in there to give it 9V like a guitar effect. This type of USB jack is called ‘Panel Mount’ when you try to order it.

stay tuned for more gizmos and antics you can recreate at home if you dare. And you should dare, it’s fun. http://woz.lol

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