ADSR schematic - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 23rd April 2010, 07:41 PM   #1
diyAudio Member
vielle568's Avatar
Join Date: Apr 2010
Location: Deux Sèvres
Default ADSR schematic

Hi Everyone,

I've built a musical instrument that works OK but could do with an ADSR envelope module to shape the output of the rhythm pulses as they don't seem to have enough punch.

I have found some circuits for synthesizers but they run off +/-18 volts and this is far too much for my instrument since it is portable and isn't connected to a wall socket. My electronics run off a 9 volt battery and the components are chosen to keep consumation down to a minimum.

Does anyone know of a simple ADSR design running off of 9V (or less) that could be used for my project? Any suggestions greatfully appreciated. Thanks.

  Reply With Quote
Old 24th April 2010, 09:59 AM   #2
diyAudio Member
Join Date: Mar 2009

Click the image to open in full size.

Original topic, go about halfway down: :: View topic - What are all the ADSR's out there to build?

Hope that helps
  Reply With Quote
Old 25th April 2010, 06:40 PM   #3
diyAudio Member
vielle568's Avatar
Join Date: Apr 2010
Location: Deux Sèvres
Hi Test Electrix,

Thanks for all the the ADSR schematics you sent me. I'll try breadboarding the circuit and see what I come up with. The only minor problem I see with the schematic is that it requires +/- 9V and all my stuff is running off of a single 9V supply with one of the op amp lines biased at 4,5V. I can probably do the same thing and see what happens. I'll also change the IC for a TL064 since it draws far less power.

The output signal will then be used to control a VCA that will shape the audio signals (or at least that's what I hope will happen). I guess I'll have to wait and see. I'll let you know how I get on...

Thank's again for your help.

  Reply With Quote
Old 30th April 2010, 07:32 PM   #4
diyAudio Member
neutron7's Avatar
Join Date: Dec 2003
Location: Toronto Canada
There is another type based on cmos switches and a 555.

you can find it here along with some other cool stuff. i have built the diode ladder filter and the moog filter and they are great.

Synth DIY

you would probably have to change the transistor resistors to a lower value so the +15v would work at +9 v
and you can use your own 9v output opamps or whatever instead of those bipolar ones.

Last edited by neutron7; 30th April 2010 at 07:35 PM.
  Reply With Quote
Old 1st May 2010, 09:45 PM   #5
diyAudio Member
vielle568's Avatar
Join Date: Apr 2010
Location: Deux Sèvres
Hi Neutron7,

That's a nice site and the schematic looks good too. You're probably right, if I change the resistor values for the transistors the circuit can be brought down to 9V. I can get away with one op amp and a TL061 will use less current. There are certain superfluous details of the circuit that I can omit all together and what's left is pretty straightforward.

Thanks for your help. I'm currently waiting for some components in the mail but soon I'll be back on track making the modifications to my instrument.

  Reply With Quote
Old 24th August 2010, 02:04 PM   #6
efabric is offline efabric  France
diyAudio Member
Join Date: Oct 2007
does it work now ?

Your firs schematic is quite similar to this one :
  Reply With Quote
Old 26th October 2016, 12:02 PM   #7
diyAudio Member
Join Date: Oct 2016
hi guys i am new for these things and i wanna build adsr for my synthesizer. I want to ask what is gate for this circuit. I mean is this a switch or i should make oscillator and oscillator's output will be gate??

Click the image to open in full size.

Last edited by LeMoNs; 26th October 2016 at 12:11 PM.
  Reply With Quote
Old 26th October 2016, 01:18 PM   #8
diyAudio Member
Tubelab_com's Avatar
Join Date: Jul 2005
Location: West Virginia panhandle
The gate signal starts the generation of the ADSR envelope. It is normally supplied by your keyboard or sequencer to signal the ADSR that a key has been pressed (or sequenced), or a note on signal has been received via MIDI.

It is a voltage level signal that is normally low, a quarter of a volt or less, usually 0 volts. When a key is pressed the gate signal will go high, 3 volts or more, and remain there until the key is released (or a MIDI note off command is received). The voltage values of the gate low and gate high signals depend on the rest of your synthesizer hardware. Low = 0 volts is common, but high can be 5 to 15 volts, with 5 or 10 volts (ARP and MOOG) being the most common.

This circuit will generate a timed series of events producing a control voltage that is usually applied to a VCA or VCF to modulate the audio signal.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote
Old 26th October 2016, 01:20 PM   #9
diyAudio Member
Join Date: Feb 2016
Originally Posted by LeMoNs View Post
hi guys i am new for these things and i wanna build adsr for my synthesizer. I want to ask what is gate for this circuit. I mean is this a switch or i should make oscillator and oscillator's output will be gate??

Click the image to open in full size.
A "gate" is a signal voltage, the ADSR changes that signal.

Normally, the keyboard of the synth has a gate signal output, together with a cv signal output. The gate signal indicates here, in case of a keyboard, when a key is pushed down and when its released. The cv signal is a voltage value for what key is being played. More info here:
Read page 3 for full understanding of gate signals and how ADSR's change that signal..

Other things that can be used as gate signals are LFO's, so yes you could build an oscillator and use its output as gate signal, but make sure it goes low enough in frequency, iow sub audio, a few tents of seconds to a few minutes is perfect. Triggering an ADSR with audio frequencies results in just a continuous signal or just mayhem, depending on the circuit used, witch could be cool.
Other useful gate signals are logic circuits, other envelopes, S&H, foot switches, ribbon controllers, joysticks, comperators. Basically anything goes.

Btw this schematic is an ADR, but easy to build.

And last but not least: Download the free Clavia G2 demo software here Downloads for Nord Modular G2 | Nord Keyboards and start patching. Modular synths are easiest to understand, you just start with 1 module turn the knobs see what it does, then ad an other module.
This is a great site to get to learn synths:
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Linn "LINTO" MC Preamp Schematic without SMPS - Schematic for SMPS wanted tiefbassuebertr Analogue Source 41 13th February 2016 05:51 PM
Adsr N Brock Instruments and Amps 8 6th February 2010 04:51 AM
i need a schematic Noshoes Parts 0 15th October 2005 06:48 PM
P 1.7 schematic help MikeW Pass Labs 20 19th June 2005 07:36 PM
So I done the schematic... Maples Solid State 2 18th April 2004 09:13 AM

New To Site? Need Help?

All times are GMT. The time now is 07:08 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright ©1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2