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 Forum index » DIY Hardware and Software » Thomas Henry designs
An Easy AD Envelope Generator
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mercury8



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

PostPosted: Sat Dec 22, 2018 1:05 pm    Post subject: Re: noob question Reply with quote  Mark this post and the followings unread

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.
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mercury8



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

PostPosted: Sat Dec 22, 2018 1:18 pm    Post subject: Re: ad generator Reply with quote  Mark this post and the followings unread

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
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kieranw



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

PostPosted: Tue Nov 03, 2020 9:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Any suggestions for adding cv control on attack and decay?
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cloudberry



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

PostPosted: Mon Jan 18, 2021 6:03 am    Post subject: Reply with quote  Mark this post and the followings unread

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.
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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Sun Oct 22, 2023 6:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Can this circuit be adapted to single supply 5V?
Thanks
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Steveg



Joined: Apr 23, 2015
Posts: 182
Location: Perth, Australia

PostPosted: Mon Oct 23, 2023 3:47 am    Post subject: Reply with quote  Mark this post and the followings unread

I don't see why not ... you would have to replace the op-amp but that is just a buffer so a transistor wired as an emitter follower might work. Would you see meaningful output ... maybe, what would you drive from it?
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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Mon Oct 23, 2023 4:42 am    Post subject: Reply with quote  Mark this post and the followings unread

I am working on some 5V Lunetta circuits.
Thanks


Steveg wrote:
I don't see why not ... you would have to replace the op-amp but that is just a buffer so a transistor wired as an emitter follower might work. Would you see meaningful output ... maybe, what would you drive from it?
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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Mon Oct 23, 2023 6:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, i was easily able to adjust for 5V circuits.
I just had to provide some DC amplification with another op-amp
(a MCP6002) to bring the peak voltage up to 5V.

When I get it drawn up I will post.


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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Fri Oct 27, 2023 4:28 pm    Post subject: Easy AD Envelope adapted to 5V use Reply with quote  Mark this post and the followings unread

https://youtu.be/V4X5PL9fRY0


The forward breadboard contains an almost verbatim Thomas Henry 555 Easy Envelope circuit adapted for 5V by me.

The VCA section is my design with H11 MOSFET optoisolators as a 12db Low Pass Gate.

This has taken over a year of experimentation to get a VCA where the clicks are there when wanted, but can be dialed out when not required.

I used 1M linear trimpots to the AD, but I need to buy some 1M log pots for the final build of the Envelope/VCA.

Thomas Henry designs are #1 in my books.

The further away board is my Generator Jones MK3 which is 3 S&Hs in series with loop function when required.


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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Wed Nov 01, 2023 9:14 am    Post subject: Reply with quote  Mark this post and the followings unread

On the TH Easy AD, should the 1M pots be linear or audio?
Thanks
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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Fri Nov 03, 2023 12:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is my 5V revision on the circuit. Fully tested. Works nice!


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zaphod betamax



Joined: Nov 27, 2020
Posts: 53
Location: sarnia

PostPosted: Fri Nov 03, 2023 8:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

https://youtu.be/QePYk7DSQ78

-100% of all sounds generated by one Monotribe.

-It gets it filter articulation from my DIYS (design-it-yourself) triple channel
Sample and Hold (with loop function). (only 1 channel used)
(I did a simple mod to allow external 0-5V Filter CV modulation)

-Later in the video I enable the built-in LFO of the Monotribe.

-I also add in built-in Monotribe noise.

-The signal out goes into a 5V version of the Thomas Henry Simple AD envelope generator controlling a "Faux Vactrol Voltage Controlled Attenuator" (FV2CA) with an H11 photofet as a cheapo low pass gate. (This is on the closer breadboard, when pictured)

-Do not feed the Monotribe after midnight.
I did. And I ended up with 6 of them!
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