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 Forum index » DIY Hardware and Software » Thomas Henry designs
CMOS ADSR
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fonik



Joined: Jun 07, 2006
Posts: 3759
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PostPosted: Sat Sep 15, 2012 11:27 am    Post subject: Reply with quote  Mark this post and the followings unread

so woody, any comments on this?
fonik wrote:
re stage gates and end trigger:
i thought of adding another TL074 to buffer these outputs.
the end trigger would occure as soon as the ADSR goes into the release stage, otherwise one would have to add an additional comparator.
is an end trigger useful when in ADSR mode?

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cheers,
matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Dec 07, 2012 6:26 am    Post subject: Reply with quote  Mark this post and the followings unread

okay. i got thomas blessing to do PCBs for the other new projects, too. the CMOS ADSR will be the next one.

i just wanted to let you all know what is coming. i will design the PCB in the next weeks. the 555-VCO will be published in january, so i don't think the ADSR will come before february (have to order/build prototypes).

anyways, please don't place pre-orders here. much too early in the process Cool

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matthias
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Paradigm X



Joined: Feb 15, 2011
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Location: Null and void

PostPosted: Fri Dec 07, 2012 7:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow, great news mattias. Im thinking of building an all TH/fonik synth, got most of the pcbs already!

All the best, look forward to it.

Cheers, Ben
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Fri Dec 07, 2012 9:31 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
I'm not allowed to post pre-orders for nor the ADSR neither the 555-VCo here
...............
..............

Smile

but if I would be allowed I would pre-order ... Smile

Your my hero Matthias

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lucid



Joined: Dec 03, 2012
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Location: Slovakia, EU

PostPosted: Sun Mar 17, 2013 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi fonik
any news with pcb?
Need some more LEDs to light up my new case.
milan
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fonik



Joined: Jun 07, 2006
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PostPosted: Sun Mar 17, 2013 2:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

i will receive missing parts later this week, then i will be able to test what i built up so far...
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matthias
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Uncle Krunkus
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Joined: Jul 11, 2005
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PostPosted: Wed Mar 20, 2013 4:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Wouldn't stage gate outputs plus a CV mixer allow the cascading/nesting of these modules?
That would enable the ability to build complex ADSRs if needed, no?
Cool

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fonik



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PostPosted: Fri Mar 22, 2013 12:08 am    Post subject: Reply with quote  Mark this post and the followings unread

i almost finished the prototype. i have to iron out some issues with the release stage gate output (does not work as expected, yet).

then i will try a few things. i initially thought of adding a switch for LFO mode, but i will have to try what i can achieve... the gate input is normalled to be high, and the trigger input is normalled to the gate"s input comparator. i will ahve to ponder about this a little bit.

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cheers,
matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Mar 29, 2013 5:09 am    Post subject: Reply with quote  Mark this post and the followings unread

so here it is, and everything is working quite nice.
i took the gates from the LEDs to feed comparators, which then output nice high level gates for the outer world.
for the end trigger i initially tapped the release gate and fed it into an inverting comparator (what did i think?), which was not usefull. why?
in trigger mode the LFO does not go into the release stage. so i tapped the output signal.
now one can patch the end out trigger to the trigger input, and then you have a LFO with adjustable rise and fall times.


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elmegil



Joined: Mar 20, 2012
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PostPosted: Fri Mar 29, 2013 6:24 am    Post subject: Reply with quote  Mark this post and the followings unread

So are we allowed to post pre-orders yet? Wink
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Mar 29, 2013 2:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

i actually wanted to order a 2nd proto before gaining interest. alas, maybe i will post in the fonik sub-forum soon.
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fonik



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PostPosted: Sat May 04, 2013 3:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

a new prototype has been finished tonight, incorporating two requested features:
the ADSR/LFO mode switch has been added to the eurorack front panel components PCB (actually just routing the end trigger to the trigger input)
the circuit PCB now offers a third timing cap, so that one could use a on-off-on toggle for the range switch. for the new prototype i used 47uF, 4.7uF, and 470uF. the 47uF is making this ADSR/LFO really slow, and i believe one could use even 100uF...

i will got o bed now, :dizzy:
so no pictures or measurements or whatever. in the next days i will start designing the front panel (will match the 555VCO and the Contr.LFO of course!).

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fonik



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PostPosted: Thu May 30, 2013 10:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

i am ready to take your pre-orders, gents:

http://electro-music.com/forum/post-385075.html#385075

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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Jun 11, 2013 1:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

new prototype has been finished:

Posted Image, might have been reduced in size. Click Image to view fullscreen.
TH CMOS ADSR by fonitronik, on Flickr

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