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 Forum index » DIY Hardware and Software
What are all the ADSR's out there to build?
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nicolas3141



Joined: May 25, 2007
Posts: 139
Location: Christchurch, New Zealand

PostPosted: Wed Feb 09, 2011 1:01 am    Post subject: Reply with quote  Mark this post and the followings unread

My LM324 based ADSR (see above) should work on 6V, but you may need to tweak a few resistor values. You possibly should look at swapping the LM324 for a low voltage version - especially if you want to run it on 5V. LMV324 would be ideal for 5V operation, but it is only available surface mount - not sure how you feel about that. There are other options, but you will need to shop around to get something through-hole.

To run it on 6V you need to create a -3V / 0V / +3V situation with a voltage divider or whatever.

Cheers,
Nicolas
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cypher



Joined: Dec 08, 2010
Posts: 12

PostPosted: Wed Feb 09, 2011 2:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi nicolas!

Thanks very much for the very fast reply.
Well, so basicly it can work also on 5-6 V supply. The voltage divider is necessary also in the case of 5V? Is the dual voltage (for example -3,0,3V) really needed (because the chip shop also work on single voltage)?

When running from the default 9V, how big is the output of this circuit ? Is it giving 0-5V on the OUTPUT or how much (I will not want to burn out the VC AMP).
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nicolas3141



Joined: May 25, 2007
Posts: 139
Location: Christchurch, New Zealand

PostPosted: Wed Feb 09, 2011 2:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Yep - everywhere in the circuit where it says 0V needs to be connected to a reference voltage halfway between the +ve and -ve supplies.

On 6V (ie +/-3V) supplies (if using LM324) you should tune the resistor values so that the output goes from 0V up to about 1V and then settles back to 0V. On 5V (+/-2.5V) you should tune it for slightly less than 1V.

If you need more than 1V out of it you will need to look at special low voltage capable op-amps like the LMV324 mentioned above.

Cheers,
Nicolas
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JovianPyx



Joined: Nov 20, 2007
Posts: 1228
Location: West Red Spot, Jupiter
Audio files: 157

PostPosted: Wed Feb 09, 2011 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's my ADSR design based on a CD4069UB IC and a TL0x2 opamp (note that I used TL082, but TL072 should work too). S1 is a "punch" switch.


ADSR3f.gif
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CMOS (mainly) ADSR
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prgdeltablues



Joined: Sep 25, 2006
Posts: 176
Location: UK
Audio files: 11

PostPosted: Sun Feb 20, 2011 5:57 am    Post subject: Reply with quote  Mark this post and the followings unread

I've been breadboarding the neat AD/AR circuit by Ian Fritz mentioned in the first page of this thread, trying out various things in the back to back diode arrangement in the feedback loop of a2 (the area of the 'truncate' switch), and thought I'd share my findings. Different diodes do have an effect on the envelope, though not very strong.

In fact, the circuit works with no diodes at all- just a wire from opamp output to - input. That gives the longest attack and decay times for any settings of the attack and decay pots. Using 1N4148's shortens the times somewhat, and using LED's makes them even shorter. Here's some screenshots from audacity showing the envelopes for various settings.

First is with min Attack and max decay. You can see using the LED's makes the decay tail off sooner. Next is with maximum attack and min decay. And finally, both Attack and Decay set to only just above minimum. You can see the LED is punchier, and hear it on the attached mp3 (this just is LP filtered white noise). (I used a 100k Attack pot and 1MEG Decay).

I'm building a hex version of this, with two of each flavour.

Peter


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A0D0LED.mp3
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oculus



Joined: Oct 30, 2011
Posts: 30
Location: Iceland, Reykjavik

PostPosted: Fri Nov 25, 2011 3:27 am    Post subject: Reply with quote  Mark this post and the followings unread

i just made Nicolas ADSR on a vero after breadboarding it,
im loving your simple circuits i think i´ll end up building them all.

it seems to be working but i just noticed that when i had a fast attack, short decay, the sustain in zero(no sustain) and the release in zero(no release) i get this sustaining voltage but when i increase the release just a bit it goes away.

here´s a sound example -
(you might have to do a right click and save link as) http://dl.dropbox.com/u/4440248/drasl/ADSR%20release%20problem.mp3

i used 470k on the 3rd opamp on the lm354 as Fonik did and added the led driver.
im using 1m pot for attack 10k sustain 470k for decay and release
also i have a ne5532 opamp on the output for some boosting if needed and inverted Envelope output.

does anyone know what might be the problem with the release ?
i thought it might be some faulty pot so i tried also using a 1m pot on the release but it was still the same,
thanks
kind regards Fridfinnur
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frijitz



Joined: May 04, 2007
Posts: 1710
Location: NM USA
Audio files: 54

PostPosted: Fri Nov 25, 2011 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

prgdeltablues wrote:
In fact, the circuit works with no diodes at all- just a wire from opamp output to - input. That gives the longest attack and decay times for any settings of the attack and decay pots. Using 1N4148's shortens the times somewhat, and using LED's makes them even shorter. Here's some screenshots from audacity showing the envelopes for various settings.

Good work. The main effect of the diodes has to do with the shape of the decay curve. With no diodes there is a long, non-expo tail due to the diode resistance increasing as the voltage drop across it decreases. With the two identical diodes, this effect is compensated, ie the decay is exponential all the way. I'm not sure about using the LEDS -- it might give a somewhat truncated decay.

Very Happy

Ian
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oculus



Joined: Oct 30, 2011
Posts: 30
Location: Iceland, Reykjavik

PostPosted: Mon Nov 28, 2011 4:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

i forgot to mention, the adsr is modulation the filter on korg ms10 in the sample i posted here above.

is anybody experiencing the same problem with the release ?

thanks Fridfinnur
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sun Nov 11, 2012 6:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Did already someone tweak the resistors for a +12V/-12V version of Nicolas ADSR?
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acidblue



Joined: Jun 26, 2009
Posts: 192
Location: The Darkside

PostPosted: Sat May 25, 2013 6:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Taking a look at Fonik's schem for the woollastonadsr I noticed there are Ferrite beads on the power supply.
Are those absolutly necessary?
Could those be left out??

about 2/3 the way down.
http://electro-music.com/forum/topic-31473-50.html
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elmegil



Joined: Mar 20, 2012
Posts: 1476
Location: Chicago
Audio files: 14

PostPosted: Sat May 25, 2013 7:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, ferrites can be left out. You can use 10R resistors or jumpers in their place, most people recommend the low value resistors.

Edit: looking at the schematic now, that's what the "10R/Ferrite" is meant to indicate, either/or.
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acidblue



Joined: Jun 26, 2009
Posts: 192
Location: The Darkside

PostPosted: Sun May 26, 2013 6:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks elmegil. Laughing

BTW is the Gate In a switched mono jack??
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elmegil



Joined: Mar 20, 2012
Posts: 1476
Location: Chicago
Audio files: 14

PostPosted: Sun May 26, 2013 7:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, it is, tied to +15V. Looks like it would be there to support the LFO function of the circuit, tying the input high.
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