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 Forum index » DIY Hardware and Software » fonik's place
TH cmos ADSRs & LFOs
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Skrog Productions



Joined: Jan 07, 2009
Posts: 965
Location: Scottish Borders
Audio files: 121

PostPosted: Tue Jan 12, 2016 11:31 am    Post subject: TH cmos ADSRs & LFOs
Subject description: Thomas Henry ADSR & LFO cmos555 .... in Blue
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Hi all Smile

I finally got round to populating these boards I ordered from Matthias a few years ago and they are now in the modular & working Smile .

The TH cmos 555 ADSR .... - before I started populating I had a look at several interesting posts here on EM and other forums , I used TLC555 & CD4052B on both boards & the 2 x 47K to pin 6 - resistor mod .

The TH cmos 555 LFO .... - For this modules Controller wave select switch, I got my on-on-on toggle switches from a guitar shop they are popular for selecting neck/ middle / bridge pickups.
When I got the switches home, I used a multimeter to find the switch middle position up/down contact layout and mine were a mirror image of the connect diagrams in the forum threads.

Here is a couple of pics of the modules.

Dave.


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DES



Joined: Feb 28, 2003
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PostPosted: Sun Jan 17, 2016 12:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow those look nice!
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LFLab



Joined: Dec 17, 2009
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Location: Rosmalen, Netherlands

PostPosted: Wed Jan 20, 2016 2:53 am    Post subject: Re: TH cmos ADSRs & LFOs
Subject description: Thomas Henry ADSR & LFO cmos555 .... in Blue
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Skrog Productions wrote:
...the 2 x 47K to pin 6 - resistor mod


They look great! What's this mod you are talking about?

I used that schematic to make these:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Based on these boards:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Almost all actives are SMT. Works great, I really like these ADSR's, I do feel that they are better suited to slow stuff though, could be the combination of capacitor and slider values (I couldn't get 500k so I used 1M, and used 470nF rather than 1uF for the cap).
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Skrog Productions



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Location: Scottish Borders
Audio files: 121

PostPosted: Thu Jan 21, 2016 1:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

DES wrote:
Wow those look nice!



Thanks dave Smile

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Skrog Productions



Joined: Jan 07, 2009
Posts: 965
Location: Scottish Borders
Audio files: 121

PostPosted: Thu Jan 21, 2016 1:58 pm    Post subject: Re: TH cmos ADSRs & LFOs
Subject description: Thomas Henry ADSR & LFO cmos555 .... in Blue
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LFLab wrote:
Skrog Productions wrote:
...the 2 x 47K to pin 6 - resistor mod


They look great! What's this mod you are talking about?



Thanks Smile

I built these using the bright red pcb's , Matthias sold a few years ago.

The 47K mod , on Mw site , I followed the cmos555 ADSR thread by Matthias and near the end pages there is a discussion about the lfo function , on my unit when I first built & tested it had the same problem when turning the attack or decay back to CCW and it froze the lfo , by bending pin 6 of the opamp up from my socket and soldering a 47K to ground and another to +V it made that section into a comparator and allowed the lfo to not freeze Smile.


Wow , your module looks nice with the led tipped faders , good job , and the pcb looks tiny Smile, nice
, my modules are 100mm by 250mm , I have plenty space round back for my nests of wiring Very Happy

Dave.

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Skrog Productions



Joined: Jan 07, 2009
Posts: 965
Location: Scottish Borders
Audio files: 121

PostPosted: Thu Jan 21, 2016 2:04 pm    Post subject: Re: TH cmos ADSRs & LFOs
Subject description: Thomas Henry ADSR & LFO cmos555 .... in Blue
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LFLab wrote:
I really like these ADSR's, I do feel that they are better suited to slow stuff though, could be the combination of capacitor and slider values (I couldn't get 500k so I used 1M, and used 470nF rather than 1uF for the cap).



Yes , when I tried them using a midi to cv/gate converter to play long notes & mono pads from the korg-X5, they were great Smile

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LFLab



Joined: Dec 17, 2009
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PostPosted: Fri Jan 22, 2016 8:29 am    Post subject: Re: TH cmos ADSRs & LFOs
Subject description: Thomas Henry ADSR & LFO cmos555 .... in Blue
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Skrog Productions wrote:

Wow , your module looks nice with the led tipped faders , good job , and the pcb looks tiny Smile, nice
, my modules are 100mm by 250mm , I have plenty space round back for my nests of wiring Very Happy
Dave.


Hey Dave, thanks! This is it in action (without front panel).
quick youtube demo

PCB is pretty tiny, it was a bear to route all the tracks (also because of the sliders on one side and SMT on the other side), but when building it, it is actually not that great a number of components, a pretty quick project to build. I am a bit surprised that not more people report about building it.

I didn't implement the end of stage outputs, so mine doesn't cycle.
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