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 Forum index » DIY Hardware and Software
2021/2022 BUILD PHOTOS
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Grumble



Joined: Nov 23, 2015
Posts: 1275
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PostPosted: Fri Feb 18, 2022 3:16 am    Post subject: Reply with quote  Mark this post and the followings unread



128 wavetables, 8bit, 1volt/octave

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Psynth



Joined: Jul 18, 2018
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PostPosted: Wed Mar 23, 2022 3:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Finally built a transformer-based power supply, until now I've used Ray Wilson's wall-wart based system. Enough current capacity for three of my cabinets.


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AlanP



Joined: Mar 11, 2014
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PostPosted: Wed Mar 23, 2022 10:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

That looks pretty grunty! I'm picking the mesh is to provide airflow for the heatsinks?
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Psynth



Joined: Jul 18, 2018
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PostPosted: Fri Mar 25, 2022 5:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Should be able to supply 1A on both +12V and -12V from each of the three regulator boards. Yes, the mesh is for airflow, and is of course safety earthed (before anyone asks).
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Fri Mar 25, 2022 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Psynth wrote:
and is of course safety earthed (before anyone asks).


Heh, that one is visable in the top image.

Nice box - at first wondered what the yellow output was for, but then realized that there is just one ground connector - probably.

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Jan
also .. could someone please turn down the thermostat a bit.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Mar 28, 2022 6:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Euro Quad Attenuverter with offset and polarity indicator.


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AlanP



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PostPosted: Mon Mar 28, 2022 11:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Interesting... I take it the opamp buffers for the LED and the offset are to make it as bulletproof as possible?
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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Mar 28, 2022 11:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, but no, the opamp before the LED is a comparator and the purpose of the offset opamp is twofold: it is there to enable the use of the zener diodes.
By applying a buffer connected to the wiper of the offset pot, the impedance as seen by the zener diodes is 100k / 4 = 25k independent from the positions of the wipers. If I didn’t use buffers there, turning one wiper would influence all other offsets.
Secondly, by using a buffer the impedance as seen from the -input of U1B does not change by moving the wiper of the offset pot, so the amplification by U1B is constant and unaffected by the position of the offset wiper.

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Grumble



Joined: Nov 23, 2015
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PostPosted: Tue Apr 19, 2022 5:01 am    Post subject: Reply with quote  Mark this post and the followings unread


Proof of concept, Echo Delay

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Grumble



Joined: Nov 23, 2015
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PostPosted: Fri Apr 29, 2022 11:23 am    Post subject: Reply with quote  Mark this post and the followings unread


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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Thu May 05, 2022 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

hmm I still have one of those blue pills,. or maybe 2.

but ehm,. no CV inputs ?
delays are fun when you can modulate them and I assume that the pots for adjusting the parameters just create a DC voltage,
so I guess that shouldn't be to hard to add.

I Like the panel layout layout layout

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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
Audio files: 30

PostPosted: Fri May 06, 2022 2:40 am    Post subject: Reply with quote  Mark this post and the followings unread

I haven’t been able to make a smooth transition from one setting of the LENGTH potentiometer (the only potmeter measured by the blue pill) to the other, so creating a cv input was not feasible.
Perhaps if I have time to spair in the future I will have a next look and maybe a next iteration of this module.
The blue pill is used for its speed, but the ram was insufficient for practical delay times so I added external memory for a total of 2MBit.
In addition I used a 16 bit ADC and a 16 bit DAC.
Alas, the ADC of the blue pill is only 12 bits, so each smallest step of the LENGTH potmeter will lengthen or shorten the delay by 32 samples
(32 samples x 16 bits x 4095 = 2MBit)

Quote:
I Like the panel layout layout layout

Thnx!

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Blue Hell
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PostPosted: Sat May 07, 2022 6:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

if your AD sampling is fast enough (or the time modulations slow enough) .. you could add analog(ish) noise and smooth the signal in the digital domain .. maybe ...

(ish) because analog noise is a bit messy to make it consistant .. so something with a pseudo random generator I guess.

This would not allow for abrupt changes, they will give some artifacts .. but could still be worthwile?

Edit: btw: was wondering .. did not hear any artifacts on changing the delay time in you vid? are you resizing and re-initializing the buffer maybe? or it may be my ears ;)

Edit2: or when the processor makes the noise .. it could be a saw siganl too .. to be added to the input signal .. to see where the transition is .. to get the extra bits.

Anyway - just some late night ideas :' )

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also .. could someone please turn down the thermostat a bit.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat May 07, 2022 10:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hope you didn’t lost any sleep over this module Jan 😔

Valuable tips to keep in mind! The reason you didn’t hear transitions maybe because I sample the potmeter once every 1024 samples?

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Blue Hell
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PostPosted: Sun May 08, 2022 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Nonono - nothing lost - I found it all back Exclamation

1024 .. being still, say, about 44Hz @ 44kHz - must be my ears Laughing

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also .. could someone please turn down the thermostat a bit.
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Mon Jun 06, 2022 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

I finally finished something (after waiting about 5 months to get some pots) ; a modified SIMA Edit 2 video enhancer.
You can see some of it in this video though my capture device + compression doesn't leave much of it intact.
It was also used for this video but that one also relies heavily on the Edirol V-4.

I also finished some video modules but I don't have any powercables and since I can't use them it doesn't feel like they are finished.
I might take some photos anyway but then I want to add more info + schematics aswell.


edit: more info about the Edit 2 here


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Grumble



Joined: Nov 23, 2015
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PostPosted: Thu Jun 23, 2022 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread



Two Euro Rack modules using two different Waveblaster synthesizers: the S2 and Ewave from Serdashop.com


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AlanP



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PostPosted: Mon Jun 27, 2022 7:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

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Super chuffed that I got this sorted! Runs fairly well on 12V, didn't end up needing a DC-DC converter at all.

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Did all the dome filter passive components with SMD, as I figured it was easier to source high accuracy components in that package (and, certainly, it would fit in Eurorack better!)

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Trimming this module is a pig of a job.
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