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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Dual CGS35 Steiner vcf
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Skrog Productions



Joined: Jan 07, 2009
Posts: 774
Location: Scottish Borders
Audio files: 87

PostPosted: Wed Apr 16, 2014 9:30 am    Post subject: Dual CGS35 Steiner vcf
Subject description: 2 vcf's & a handy multiple
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Hi there , while finishing the panel design for my CGS89 sequencers I thought I would try some ideas for the panel for 2 CGS35 Steiner vcf's , and get the 2 designs done at the same time at the local sign / printers shop.
After a few mock up designs , I've settled on this layout Smile .

I had a look at some great looking diy CGS35 modules just doing a pic search , most having either 3 separate inputs for the HP in / BP in / LP in or a single input with selector rotary switch .

After a coffee & a blueberry muffin Smile I sketched some ideas for inputs , using a 3 pole / 2 way toggle switch (middle of the panel under the pots) ,in the up position, set to "Thru inputs" in1 goes to HP / in2 to BP / in3 to LP .
Switched in the down position,"mixer", it connects to a 3 pole 4 position rotary switch, where pole A goes to HP / pole B to BP / pole C to LP , the rotary will be wired to send a sum mixed out of the 3 inputs to all or each individual vcf in.

.....And I had room for a handy 1 in / 3 out multiple, Smile .

here's the first blue panel layout ,this design may get some adjustments before printing at the shop Wink .


Dave.


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Skrog Productions



Joined: Jan 07, 2009
Posts: 774
Location: Scottish Borders
Audio files: 87

PostPosted: Wed Apr 16, 2014 9:41 am    Post subject: Reply with quote  Mark this post and the followings unread

bare boards....


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Skrog Productions



Joined: Jan 07, 2009
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Location: Scottish Borders
Audio files: 87

PostPosted: Wed Apr 16, 2014 9:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Quick text fix on the input sockets....
Panel V2.


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Skrog Productions



Joined: Jan 07, 2009
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Location: Scottish Borders
Audio files: 87

PostPosted: Mon Apr 21, 2014 6:51 am    Post subject: Reply with quote  Mark this post and the followings unread

2 boards stuffed with components now.
The supply will be my usual +/- 12V, reading the documents, I have wire linked the 2 diode positions with the rings round them.
The panel sticker is due through the week , tho I think I will finish the gate sequencers first.

Dave.


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Skrog Productions



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PostPosted: Sat May 10, 2014 6:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi , Tackled a bit more of this module last night Smile .

Panel is now drilled / stickered / pots 'n' sockets on , boards wired .
I just need a couple of 1K pots for the res. controls , I'll order them while i'm at the wiring stage Smile .
Dave.


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Skrog Productions



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Location: Scottish Borders
Audio files: 87

PostPosted: Sat May 10, 2014 6:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

At the wiring stage now , hope to have this working by next weekend Smile .

Dave.


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Skrog Productions



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Audio files: 87

PostPosted: Tue May 13, 2014 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi again Smile

Module now wired & front panel finished , Tested the supply cables & powered it up without chips first, then power up with chips , all good so far .
Just need to set up the cv trimmer for the cutoff action and also set the trimmer I put in instead of the 2K2 in the resonance area.
I used 2N3904 for npn on one vcf and 2N2222 on the other vcf , both have 2N2907 for pnp ,the 2 vcf's sound pretty similar , but I've used up what was in the component drawers Smile .
For the audio inputs I have a level pot for each hp/bp/lp inputs , flicking the toggle switch makes them act as a 3 input mixer ( veroboard simple mixer) the rotary switch sends the sum of this mixer to - all pass/hp/bp/lp .

Some pics below and sounds to follow through the week after I've set the trimmers Smile .

Dave.


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Skrog Productions



Joined: Jan 07, 2009
Posts: 774
Location: Scottish Borders
Audio files: 87

PostPosted: Sat May 17, 2014 7:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Hullo , sounds Smile Smile


Test sound 1 ....
Patching a vco saw and squ with pwm swinging away into the mixer (switch set to "mixer") , with a slow ramp lfo into the cv input of the Steiner vcf , the first slow rise is the mixer sent by rotary switch to low pass .
The second rise is mixer to band pass.
The third rise is mixer to high pass.
And the fourth rise is mixer to all pass.


Test sound 2 .....
A sequenced vco outputting saw to In1 high pass / squ to In2 band pass / tri to In3 low pass (switch set to "thru inputs") , ADSR to cv1 and an lfo to cv2 , twiddling cutoff , res , & cv amounts while the sequence runs.

Dave.


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CGS35 Steiner vcf test sounds 2 thru inputs.mp3
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