I made a new thing (kick drum + bass material inside)

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devinw1
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I made a new thing (kick drum + bass material inside)

Post by devinw1 » Thu Sep 05, 2019 11:13 pm

Update 11/3:
-Final version picture shown below. CHanges from original are the "click" was removed, and the filter is now a 2-pole (12 db) VCF with resonance. Also, there are 3 modes for the envelopes.
-Demo video:

-------original thread--------------
Sooooo, I like drums, and I like OTAs, so with the release of the DIP version of the AS3280 I decided to make a kick drum and bass synth using just 2 of those and some op amps, and I think it came out pretty good! It has 2 envelope generators (done old skool with a 4001) that can be AR or AD so it works as a kick or a bass synth. It has 4 waveforms, sine, and then a choice to mix it with 1 of square, tri, or 2x frequency sawtooth. I had an extra half of a 3280 so I put a little 6 db filter on it which can also be controlled by the pitch envelope. 10 HP Euro for the whole thing.

It uses the same VCA snipped out of the Pro-One/PRO2021 and slams quite nicely! Some samples below (sorry it starts clipping on the first one. I overdrove the input out in my shop and didn't notice.).

A pic of the unit:
Image
Sound samples:

https://soundcloud.com/saywaht/b1-sound ... und-sample (kick mode)

https://soundcloud.com/saywaht/b1-sound ... und-sample (bass mode)
Last edited by devinw1 on Mon Nov 18, 2019 12:19 pm, edited 4 times in total.

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tjs
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Post by tjs » Fri Sep 06, 2019 7:29 am

Nice. Good job. When will it be available?

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Post by devinw1 » Fri Sep 06, 2019 10:07 am

Thank ya tjs! I'm thinking pretty soon. I just have to make some build documents and tidy everything up, so maybe another couple weeks! :sb:

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Post by devinw1 » Fri Sep 06, 2019 10:09 am

Oops forgot link to samples in "bass mode". Link added to bottom of first post. :bananaguitar:

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Post by mome rath » Fri Sep 06, 2019 5:38 pm

very cool

PCB/panel kits, yeah?
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Post by rosch » Sat Sep 07, 2019 11:29 am

going to watch this :)

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Post by devinw1 » Sat Sep 07, 2019 11:53 am

mome rath wrote:very cool

PCB/panel kits, yeah?
For sure. Just gotta finish up the docs and boms. :tu:

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Post by Panason » Sun Sep 08, 2019 11:37 am

I'll take two of these, a crispy snare and a sizzling hat in a box to take away please. :miley:

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Post by devinw1 » Mon Sep 09, 2019 10:28 am

Panason wrote:I'll take two of these, a crispy snare and a sizzling hat in a box to take away please. :miley:
Heh, that sounds pretttty prettty good. :hihi:

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Post by devinw1 » Mon Sep 23, 2019 11:22 am

I'm working on a second spin of this before release, with some improvements, so it will take a little longer, but will be better!
1) Tone control (LP VCF) is now 2 pole (12db)
2) In kick mode, VCO is reset (sync'd) to trigger pulse so waves start at zero for every hit. THis is something Roland does and I think it will be useful for short attack times. As a caveat, if you let the decay go reaaaaaly long, then if you re-trigger with the VCA still open a bit, you would hear a click when the wave get's re-synced for the next hit.
3) Trigger conditioning and impact "click" sound is improved.

I am just finishing the last part which is to make sure the Reset VCO signal only fires when in kick (AD) mode and is bypassed for Bass (AR) mode.

IF I can squeeze it in, I also want to put a sync jack which, when in Bass mode, will allow the VCO to take an external sync waveform from another oscillator, for more fun possibilities.

:tu:

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Post by J3RK » Mon Sep 23, 2019 12:08 pm

Nice sounding module!

Also, the bassline in the bass demo sounds very much like the Congo Bongo death tune. :yay:

(about 20 seconds into this video)

[video][/video]

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Post by devinw1 » Mon Sep 23, 2019 12:56 pm

Hahahah yes!

I am a product of the video game generation indeed. It's probably in there somwhere. :hihi:

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Post by devinw1 » Fri Nov 01, 2019 8:06 pm

I made a crappy little demo video. Sorry for talking so much. Haha. I need to get better at this. The new version is complete and I am working on the build docs and will get some final panels (laser etch like my 2VL1. the demo one you see is a FPE engraved one. Not quite as nice as the production ones will be) made and for sale for those who want to build one of these.



BTW, that unit on the left is an early prototype. Pay it no mind. :D

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Post by honeyb » Sun Nov 03, 2019 2:57 pm

Really happy with my 2VL1 dual osc, looking forward to this voice as well. Will then panel/PCB be available via THONK? Or is it easier to order directly from you? I have a US address which can handle small deliveries.

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Post by devinw1 » Sun Nov 03, 2019 8:50 pm

honeyb, I'll have an update soon re: purchasing panel/pcb sets. :tu:

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Post by Tonescape » Mon Nov 04, 2019 5:42 am

Looks great! I am enticed by this.

Does it have VCO reset, or is it free running? Thanks.

Edit: Arh, you mention that in the Video. Nevermind :hihi:
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Post by Quinie » Mon Nov 04, 2019 7:24 am

Sounds great, would love to have one of these.

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Post by SphericalSound » Mon Nov 04, 2019 5:38 pm

So, what´s the difference between AS3280 and lm13700?. Both are double OTAs, but the 13700 are cheap as chips.

Im sure there´s a good reason :omg:

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Post by devinw1 » Mon Nov 04, 2019 6:12 pm

Well, I'm not an expert on it as much as some are, but it is generally thought that the CA3280 is a bit better of an OTA from a distortion perspective, and I believe the way the linearizing diodes are implemented are better with the 3280. The 3280s are long discontinued, but since Alfa is remaking them again (and now in DIP format), I figured I would use some, starting with this module, which uses the VCA circuit right out of my Pro-One clone.

The price is not so bad on the AS3280s at about $4 a pop. Erika Synths has them, and I'm talking to Thonk now and it sounds like they are going to carry them.

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Post by devinw1 » Sat Nov 16, 2019 2:02 pm

Build doucmentation and BOM are live!:

https://westonaudio.com/page4.html

And Thonk will have PCB/Panel sets available shortly (probably 1-2 weeks). They tell me they will also have the DIP 3280s stocked. :sb: :sb:

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Post by gtrmstr53 » Sat Nov 16, 2019 4:40 pm

Very cool!

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Post by pfzzz » Tue Nov 19, 2019 11:30 am

CV over bend, would be cool! or generally more CV, expansion ? :)

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Post by devinw1 » Tue Nov 19, 2019 1:06 pm

Maybe V2.0 pfzzz ;) :lol:

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Post by SphericalSound » Wed Nov 20, 2019 11:22 am

If you do a revision, would be cool to add the 13700 option ;)

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Post by devinw1 » Wed Dec 18, 2019 12:22 pm

Now live on Thonk!:

https://www.thonk.co.uk/shop/weston-b1/

You can get the 3280 DIPs from them too. :tu:

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