# 4ms Dual Looping Delay (DLD) DIY **URL:** \ **Category:** DIY STUFF\ **Created:** [February 4, 2021, 11:35pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880 "2021-02-04T23:35:46Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 4, 2021, 11:35pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/1 "2021-02-04T23:35:46Z")
Hi ! I’ve been looking for some days into DIY delay modules. I have found some interesting stuff, but not exactly what I’m looking for. I really like the sound of the 4ms DLD module. Do anyone here know if there’s a way to make it DIY ? links to schematics ? Or any module that ressemble it. It would really help me ! Thanks 🙂 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [February 4, 2021, 11:49pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/2 "2021-02-04T23:49:47Z")
Here’s maybe some ideas 🙂 > [@Cheap pt2399 reverb/delay module diy](https://lookmumnocomputer.discourse.group/t/cheap-pt2399-reverb-delay-module-diy/801/3): > > speed man wink already in the process of this construction here’s a little schem for the op amp out (it’s not mine but I was inspired by it) for CVin with a vactrol on time pot see here if you have another question ? and this one > [@Reverb-O-Matic (100 FXs/Reverbs)](https://lookmumnocomputer.discourse.group/t/reverb-o-matic-100-fxs-reverbs/1856): > > Inspired by a remark by [Juanito Moore](https://www.youtube.com/channel/UCm1OTU3rnRpBZp7vBExsQEQ) I made a euro rack version of a reverb unit based on a reverb board that one can buy at various places for less than 15 USD. Here is an example I found on [aliexpress](https://www.aliexpress.com/item/4000133632325.html?spm=a2g0o.productlist.0.0.53e44aa3IXsZYD&algo_pvid=2da0a08d-d12c-4a0f-8af6-adf9dff0b302&algo_expid=2da0a08d-d12c-4a0f-8af6-adf9dff0b302-2&btsid=0b0a050116007244904874937e1922&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_): It contains some circuitry and a signal processor programmed with 100 different reverbs and/or reverb style effects. You can see it in the following picture attached to the module. As you can see the circuit board comes with some cables. Note that the color coding of the wires may n… ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 4, 2021, 11:50pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/3 "2021-02-04T23:50:51Z")
yeah thanks ! I’ll check this in a minute 🙂 ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 5, 2021, 1:09am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/4 "2021-02-05T01:09:50Z")
![638737853c09be443666218368b1168aca518ef8](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/d/d74ce625cf92253cc20f9652cab74167cddf71d1.jpeg) The cheap pt2399 looks great ! What’s the purpose of theses “tracks” on the veroboard (highlighted in magenta) ? And how do you connect the circuit to your power supply ? I see the 12V wire, but I don’t understand where its going 🙂 ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 5, 2021, 1:13am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/5 "2021-02-05T01:13:06Z")
And is it difficult to modify a circuit ? I’d like to, but I don’t have the knowledge (yet) to do it. How long was it for you to understand ? ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [February 5, 2021, 1:16am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/6 "2021-02-05T01:16:24Z")
The “IC” at the lower left is really a Eurorack style 10 pin power header. So those three strips are +12 V, GND, and -12 V. ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 5, 2021, 1:18am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/7 "2021-02-05T01:18:22Z")
Thanks ! I didn’t know that… Its useful haha 🙂 ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 5, 2021, 1:21am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/8 "2021-02-05T01:21:56Z")
ah one thing… is it only a representation ? or you have to physically put something on the track (where the rectangles are) ? ---
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [February 5, 2021, 8:22am UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/9 "2021-02-05T08:22:35Z")
The tracks can be seen as flat copper wires glued to the board. So anything you solder to them picks up the signal or whatever is on them. Combining tracks with electrical components like capacitors and resistors etc. makes a circuit. Does that answer your question? ---
**Author:** ![Alex1](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alex1/32/11949_2.png) [@Alex1](https://lookmumnocomputer.discourse.group/u/Alex1)\ **Post date:** [February 5, 2021, 4:28pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/10 "2021-02-05T16:28:19Z")
Not exactly ! I wasn’t talking about the tracks themselves, but the rectangles drawn on them. Do I need to add something to the circuit where the rectangles are ? Or is it only to help understand the circuit? ![2222](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/0/0a47881d46dba9ae281e2debd61d1c25db8b43a9.jpeg) Is it clearer like that ? I pointed the rectangles with blue arrows on the right 🙂 My guess is that there’s nothing to add, but I wanted to be sure ! Thanks ! ---
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [February 5, 2021, 5:04pm UTC](https://lookmumnocomputer.discourse.group/t/4ms-dual-looping-delay-dld-diy/2880/12 "2021-02-05T17:04:18Z")
I have no idea why these rectangles are there. You now understand that the tracks beneath them are the power lines, so I’d forget about them.