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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Eurorack Soundlab
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Zodiak



Joined: May 20, 2007
Posts: 249
Location: Gillingham, Kent UK

PostPosted: Tue Apr 23, 2019 1:25 pm    Post subject: Eurorack Soundlab Reply with quote  Mark this post and the followings unread

This is my SoundLab rehoused as a Eurorack panel.
I have added a few upgrades from the soundlab plus and ultimate, most of which are mounted as various daughter boards.
Total upgrade to +/-12V
LFO: Inverted output on ramp
ARG: Trig level control, inverted output
VCO1: PWM, Triangle out, external sync in, and high frequency compensation
VCO2: Triangle out, external sync in, and high frequency compensation
VCF: Exponential tracking, including high frequency comp
VCA: Exponential tracking.
This is the 3rd incarnation of that board and has been a background project for the past 12 years, but I think that it is almost done now. Apart from the VCO tuning which is picking up noise from the supply rail Smile


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ixtern



Joined: Jun 25, 2018
Posts: 143
Location: Poland

PostPosted: Wed Apr 24, 2019 12:22 am    Post subject: Re: Eurorack Soundlab Reply with quote  Mark this post and the followings unread

Zodiak wrote:
This is my SoundLab rehoused as a Eurorack panel.
I have added a few upgrades from the soundlab plus and ultimate, most of which are mounted as various daughter boards.
...
This is the 3rd incarnation of that board and has been a background project for the past 12 years, but I think that it is almost done now. Apart from the VCO tuning which is picking up noise from the supply rail Smile

Nice looking set.
If you don't want to pick up noise, connect tuning pots to the +- reference voltages rather (+- 9 to 10V) than to the supply rails. It is easy to get them with TL431 or dedicated ref ICs (78Lxx/79Lxx are not so stable regarding temperature changes).
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Zodiak



Joined: May 20, 2007
Posts: 249
Location: Gillingham, Kent UK

PostPosted: Wed Apr 24, 2019 7:47 am    Post subject: Re: Eurorack Soundlab Reply with quote  Mark this post and the followings unread

ixtern wrote:

If you don't want to pick up noise, connect tuning pots to the +- reference voltages rather (+- 9 to 10V) than to the supply rails. It is easy to get them with TL431 or dedicated ref ICs (78Lxx/79Lxx are not so stable regarding temperature changes).

Thanks I was gong to use a pair of those 78/79 100ma devices, but will look at that instead.

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