electro-music.com :: View topic - An Easy AD Envelope Generator

| | | |

FAQ

Calendar

Memberlist

Usergroups

Links

Profile

Chat Room

Live at electro-music.com radio 1 Please visit the chat
	host / artist	show	at your time
today>	Twyndyllyngs - time may be inacurate	Chez Mosc

Forum index » DIY Hardware and Software » Thomas Henry designs

An Easy AD Envelope Generator

Moderators: Scott Stites
Page 4 of 4 [79 Posts]

View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Goto page: Previous 1, 2, 3, 4

Author

Message

mercury8

Joined: Nov 25, 2018
Posts: 14
Location: grand rapids ohio

Posted: Sat Dec 22, 2018 1:05 pm Post subject: Re: noob question

mercury8 wrote:

can this run off 12v?? and I thought most gate signals were +5v and it says that the gate responds to 1.8v? does this mean I need to have a gate that is a minimum of 1.8v? sorry about noob questions. im just trying to use this as a typical ar generater. typical 1voice snyth setup

I see now.ok a signal of ATLEAST 1.8v.

mercury8

Joined: Nov 25, 2018
Posts: 14
Location: grand rapids ohio

Posted: Sat Dec 22, 2018 1:18 pm Post subject: Re: ad generator

Grumble wrote:

mercury8 wrote:

can this run on 12v instead of 15 v?? and why does the schematic call for 100pf cap for c2 and the layout has a 10nf for c2??

Yes, it can run on 12 volt, but the resistors R6 and R7 have to be recalculated, since the threshold pin will trip at 2/3 Vs, so at 12 volt it trips at 8 volt, you have to devide that to 5 volt: R6 = 3k3, R7 = 5k6.
As far as I can see, what is called C2 on the stripboard is actually C3 (10nF going to pin 5 of the 555) and C2 is placed on the input connectors (off print).

thanks a lot grumble. I tried running it on 12 v euro ps and got signal through it but that's it. so it didn't work. I believe that I do need to change r6 and 67 and I think I got c2 and c3 mixed uo. thanks a lot. really appreciate it

kieranw

Joined: Oct 18, 2020
Posts: 1
Location: glasgow

Posted: Tue Nov 03, 2020 9:18 am Post subject:

Any suggestions for adding cv control on attack and decay?

cloudberry

Joined: Jun 30, 2009
Posts: 51
Location: uk

Posted: Mon Jan 18, 2021 6:03 am Post subject:

Quote:

Any suggestions for adding cv control on attack and decay?

-the easiest way would be to use vactrols. Alternatively, OTAs (LM13700, CA3080).

While I'm here - I found that adding the comparator caused tuning issues. It seemed to me that the comparator dumping as much current as it can into the base of the input transistor/input stage was causing problems, if this circuit's ground is near to a VCO ground. So, adding a resistor (about 1K) to the comparator output fixed this.

Moderators: Scott Stites
Page 4 of 4 [79 Posts]

View unread posts
View new posts in the last week
Goto page: Previous 1, 2, 3, 4
Mark the topic unread :: View previous topic :: View next topic

Forum index » DIY Hardware and Software » Thomas Henry designs

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum