Paia 2720 3L Lowpass filter - DIY Modular in a Week 7.1

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I begin day 7 with a pretty mellow filter. The Paia 2720-3L is a lowpass filter with no resonance. It is still a nice filter to shape the harshest overtones of a sound. quite an easy build but could be a little more complicated (and better) by adding a CV summing mixer for the CV input and freq knob. That is discussed in this video but not shown. For info on how to build a cv summing mixer take a look at MiaW 1.2: • Classic 2 Op-Amp tri ...
Day 7: Filters
Part 1: Paia 2720-3L Lowpass filter
Difficulty: Intermediate/Easy...
Price: ~4$
MiaW playlist: • Modular In A Week (MIAW)
Visit my Patreon page for more (different) content, or if you just want to support my work more than just a thumbs up :)
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Link to the schematics on SynthDIY.com:
www.synthdiy.co...
Front panel design:
www.dropbox.co...
Link to the component spreadsheet:
www.dropbox.co...
Link to my dropbox folder where ALL the files for all the episodes as they become available:
www.dropbox.co...

Опубликовано:

4 окт 2024

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Комментарии : 45

@gordonrobertson102 4 года назад

I built the 2720 3L lowpass filter but was quite underwhelmed with it, though listening to this video it sounds a bit better than I can remember. On the other hand the 2720 3B sounds much better, I was that guy ( gasboss775 ) who posted the modded 2320 3B circuit. It is worth adding the exponential current source as this greatly extends the range of the filter, also I thought it sounded better with a red led than the 1n4148 diodes.

4 года назад

Yeah I don’t have it in the rack anymore. As it was to subtle. I have your schematics in my todo pile. They did sound really nice. Thanks for rewriting and missing them. :)

@marsmediapro 4 года назад

I will soon build s simple circuit to expand the trigger out of the Behringer RD-8. The circuit requires a diode, and I am curious to try using an LED instead. This video suggests that this may be a possible substitution- Thanks for posts!

4 года назад

Please let me know if it worked. Be aware that LEDs are much more "noise" than regular diodes, so it might affect the sound...

@bluesgut 5 лет назад

Awesome work as always.

@jakedariel7071 3 года назад

Pro trick : you can watch movies on kaldrostream. Been using them for watching loads of movies these days.

@taylorharlem4932 3 года назад

@Jake Dariel definitely, I've been using kaldroStream for months myself :D

@rayibrahim4267 3 года назад

@Jake Dariel yea, have been watching on KaldroStream for months myself :D

@royalanson1440 3 года назад

@Jake Dariel yup, have been using KaldroStream for months myself =)

@giovanniryder4057 3 года назад

@Jake Dariel yea, I have been using KaldroStream for years myself =)

@cl3mens 5 лет назад

And I think that this filter is at a fixed cutoff frequency (think I heard something about 500 hz?). R7 and R8 would need to be variable to make it controllable. So you just chosse 0-12 db/oct. But this makes it even more unique and interesting in my eyes. Everybody has a variable resonant filter. :D Tone control is the next big thing!

@cl3mens 5 лет назад

I want to build a fixed filter bank as well for similar reasons. I wonder if I can do it under $3 exkl. jacks?

5 лет назад

Huh... I didnt read that much about it, it looked simple and I built it ;) But can the cutoff really be fixed, since you can sweep the cutoff with the frequency knob? I am just speculating, I really dont know, but yes, this filter definetely has its place in the sound sculting tool kit... This must be nice on deep bass sounds....

@justinahrens1868 3 года назад

I noticed that on the spreadsheet, you left out the capacitors. Just curious what you used for the uncommon .005uf caps.

3 года назад

You don’t need to use polar cap for this it’s just a simple 5nf or 4n7.

@aaroninja1 5 лет назад

A new vco based in the 3340 with all the waveforms, FM, sync would be great in modular in a week, look mum no computer haven't complete it.

5 лет назад

Well there won’t be time in this “series” but I have in mind to do a series on all those chips that are synth specific and I will definitely do a vco based on the 3340. But just that chip costs more than any module in “Modular in a Week” 😅

@aaroninja1 5 лет назад

@ yeah, the cem 3340 are expensive but there's a clone named as3340.

@ulyssestussock3220 5 лет назад

Aarón Espinoza Castro yes I bought two as 3340 from electric druid £5 each free shipping !! Built two lmnc layout oscillators . Still to test sync but otherwise fairly easy vco 1v/ oct

@spot2028 5 лет назад

Hey Kristian! Finally building the filters! Yay! Question on resistor parts list. The spreadsheet calls for 4x220k resistors which I can't find in the schematic. Are these used on the j3-j5 inputs due to different voltage (12v vs 18v)? Thanks as always!

5 лет назад

Awesome! That also means temperature has dropped in you garage? So you can be in there again. :) I’ll check and get back.

@spot2028 5 лет назад

@ Eh, temp drop - not so much :(. Just learning to deal and do things in short bursts. Also, realized this is passive after sending the message, so power not a factor. Thanks!

5 лет назад

Spot 20 I think it says 330k in the schematics. I had 220k in bulk so I think that is why.

@spot2028 5 лет назад

@ I happen to have both, so using 330k like the schematic should be ok, correct? Thanks for checking on this, take care.

@nimaschacher1907 4 года назад

You build thr filter right? So wich Values you use for the capacitors?

5 лет назад

So whih do you sound better? The 1N4148 or the Red LEDs? I think after listening quite a lot that the red LEDs went a bit lower down... But as I asked, what do you think?

@cl3mens 5 лет назад

Hmmmm I did not really hear any difference. I like that sound as you sweep it, sounds slightly resonant? I do not have mine up and running at the moment but I used 1N4001:s or something similar.. I substitute every NPN transistor with BC547 since I am lazy and keen on keeping it simple.

5 лет назад

@@cl3mens Actually the resonance is just the square waveform showing its jagged edges (I think) When it is full open (as open as it can be) it is almost a square wave again, and it sounds resonant COMPARED to when the filter is closed, because you hear the overtones I guess... Took me quite many listens to before I figured that out :) And just as I say in this video and others aswell, almost all BC547,548,549 seems to be able to switch between them, with at least similar result.... So that is a good way of keeping the nr of different parts to buy down :)

@bluesgut 5 лет назад

First listen I heard more range out of the led

@gordonrobertson102 4 года назад

Definitely more range with the LED, I'm going to try this out myself.

@alvarosanchez7569 5 лет назад

Hi can I use any other transistor then the Bc547? Like 2n3406 or 2n2222

@cl3mens 5 лет назад

I've been told that the 2n2222 and 2n3904 are usually equivalent to bc547/8/9 in many applications.

5 лет назад

As cl3mens already said, and also just TRY with any other NPN transistor. The 2N3906 wont work as that is a PNP transistor. You need its NPN sister 2N3904 in that case (as already pointed out)....

5 лет назад

Put a three pin female socket where the transistor should be and then just swap them out and try which one sounds the best... ;)

@alvarosanchez7569 5 лет назад

Ohh thanks kristin an cl3mens. Also guys, how can I add resonance or is impossible in this circuit?

@alvarosanchez7569 5 лет назад

@ thanks a lot for this videos, I always want a modular synth. Thanks from Peru

@dougnut_8046 5 лет назад

Modular in month?

5 лет назад

In a lifetime. 😅 soooo many filters....

@GreenBrainARC 4 года назад

I couldn't find day 6 & 7 in the Dropbox 😔

4 года назад

It’s probably because I didn’t make any of my own files those two days. I only used publicly available files on respective makers homepage. Look in the spreadsheet, video description and in the panels folder for the panels for the modules.

@GreenBrainARC 4 года назад

@ OK, thank you 🙂