CMOS ADSR

Thomas_Henry

Hello everyone,

Here's the next project. This is a full-featured ADSR with indicator lights. It was really fun to come up with the logic for this---lots and lots of scribbling on scratch paper was required. The hard part, of course, was figuring out how to indicate the Sustain phase. That kept me going for a while.

Note that it can also be used in AR and AD mode with equal ease.

Thomas Henry

Sheet 1.jpg

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Schematic --- Sheet 1

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Sheet 2.jpg

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Schematic --- Sheet 2

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Parts List.jpg

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Parts List

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andrewF · Posted: Tue Aug 07, 2012 6:09 pm Post subject:

love the Leds for each stage Cool

what a great feature

Thanks for sharing Thomas

v-un-v · Posted: Wed Aug 08, 2012 11:16 am Post subject:

We like lightshows! Very Happy

thebot · Posted: Wed Aug 08, 2012 12:51 pm Post subject:

Love the idea of four separate LEDs for each stage. This would make a great first ADSR, would really help new synthesists to visualise the typical ADSR sounds. Lovely design Thomas, thanks for sharing.

v-un-v · Posted: Wed Aug 08, 2012 1:52 pm Post subject:

Thinking about it, if one made the front panel to this design out of white perspex, and used the LED's (each coloured differently- naturally) to illuminate the front panel.... wouldn't that look nice? Idea

Uncle Krunkus · Posted: Wed Aug 08, 2012 2:38 pm Post subject:

Beautiful! Cool

Boogdish · Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN

Very cool, thanks for sharing Thomas! This would be a great project to use clear shaft pots with LEDs under them. I agree with "thebot" this would be a great module for showing people new to synthesis how it works.

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

is someone doing a PCB run on this project or has some PCB-Layouts - I'am very interrested

Appliancide* · Posted: Sun Aug 12, 2012 11:35 am Post subject:

This is great! With all of the logic for the leds worked out already, it shouldn't be too much work to derive "stage high" gates and end out triggers.

elmegil · Posted: Sun Aug 12, 2012 12:11 pm Post subject:

A relative noob asks: what are "Stage high" Gates? End triggers seem obvious enough....

Appliancide* · Posted: Sun Aug 12, 2012 1:35 pm Post subject:

I was picturing a gate out that would be held high while the corresponding led was lit, if that makes it easier to grok.

elmegil · Posted: Sun Aug 12, 2012 2:27 pm Post subject:

Ok, that was what I was thinking it must be given context, but I hadn't heard of such things being used/useful before Smile

Danke!

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

may I ask a noob question to this project regarding the shematics??..

on sheet 1 at the trigger and gate jack there are lines with arrows
near trigger one between the J1 and C1
and near gate between J2 and R16, here the arrow is pointing from +15V

is this a potentiometer, a direct connection or ... ???

Saw the arrows on potentiometers or trimmer, but never like that ...

please could someone explain??

blue hell · Posted: Wed Aug 15, 2012 6:44 am Post subject:

These are switches in the connectors which are opened when a plug is put in.

schmidtc · Joined: May 16, 2009 Posts: 34 Location: Boston

Thanks TH! Further proof you are the master of functionality and simplicity in design. A few questions. . .

1.) Output is 0 to +5V log response?

2.) The switching jack on the trigger in allows gate only adsr?

3.) What's the range switch do?

4.) Any info on the times of the envelope stages?

If this is too many questions, "build it and see" is an acceptable response Wink

fonik · Posted: Tue Sep 11, 2012 6:31 am Post subject:

marvkaye · Joined: Mar 14, 2011 Posts: 225 Location: Fla

As much as I'd prefer a nice double-sided through-hole plated PCB for this incredibly cool EG (thank you Thomas, you never fail to amaze...) I confess that I'm not up to the task and so decided to take the coward's way out and create a strip board layout instead. After a few false starts I finally managed to come up with a reasonable design, finished size is just under 1.5 X 4.5 inches (37 x 114mm for those of you who prefer metric) and thought I'd share it here for anyone who's itching to build one of these in a more permanent format than breadboard.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Tomorrow I'll see about getting another picture up with all of the panel connections (green squares) labelled... please note, I have not physically built this yet but did double-check it for accuracy using the test mode in LochMaster, which actually works pretty well. I'll give it another once over tomorrow with less tired eyes, just to be sure. Please let me know if you spot any glaring errors. I hope you find it useful.

<marv>

(edit... I almost forgot... the connection between IC1 pin 2 and IC4 pin 5 needs to be done with a jumper wire that's not shown on the stripboard. )

(edit 2... here's the panel wiring map...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

<m>

elmegil · Posted: Thu Sep 13, 2012 5:12 am Post subject:

For Lochmaster, on the rear view, the cuts are obvious enough, but what are all the circles? They don't seem to correspond to the pins coming through the board, but I confess I haven't counted out to triple check that.

-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

I think the circles are solder. The board is flipped bottom to top rather than left to right. I didn't know the circuit layout could be tested before building. That's a good feature.

It's probably just me, but I would be trying to make the layout fit in just over half that space. I'd try not to run jumpers under the IC's (or over as I have seen before elsewhere). I never run components diagonally. I don't even like having them horizontally orientated, unless to do otherwise will increase the footprint substantially. Anyway, I hope it functions first time for you. That's always a nice feeling.

elmegil · Posted: Thu Sep 13, 2012 6:25 am Post subject:

Ah, yes, top to bottom lines up. Thank you Smile

marvkaye · Joined: Mar 14, 2011 Posts: 225 Location: Fla

Bump to point back to the edit above where I added the panel wiring map to the strip board layout post.

marvkaye · Joined: Mar 14, 2011 Posts: 225 Location: Fla

elmegil · Posted: Thu Sep 13, 2012 10:41 am Post subject:

Right, I built minus' TR-808 drum voice stripboard, and figured that out pretty quickly (about the drill bit). Although my stripboard must be slightly wider or something because I still had to go back and clean up with an exacto (aka razor knife).

I've never had ANY luck using a dremel for anything of any precision, so I think I'll stick with the knife for the narrow cuts too Very Happy

Cutting wheels in particular always seem to fly apart at the worst possible moment, and I don't have any kind of reciprocating dremel or attachment. Maybe a teensy diamond head, who knows, but I'd probably end up cutting 3 strips instead of just one.

-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

Actually, I think that was slacker I think who originally posted that stripboard of the 808 kick drum.

Yes, if it weren't for uncle krunkus and his wsg stripboard, I may never have ended up on the stripboard path.

A 3MM drill bit works for me, but I guess you could go up to 4MM if it wasn't wide enough to cut the width of the tracks.

Anyway, I wouldn't mind giving this circuit a go!

wmonk · Posted: Sat Sep 15, 2012 5:00 am Post subject:

Have to say this is a beautiful design. Wow, so simple Smile

Thomas did it again!

Now I'm going to build one on stripboard Smile

Perhaps a nice add-on which would be very unique is to connect a buffer to the same place as the LEDs, that way you have gate outs depending on the stage. Smile

Edit, oh, I forgot to read all comments again, it was already mentioned. Cool