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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Mon Feb 05, 2018 3:07 pm Post subject:
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Yes. at least the INH input should be tied to ground, to not inhibit the switches. Or otherwise the pin might charge up slowly causing the circuit to not work, or work glitchy.
But also the unused B and C switch control lines should be defined. In this case it does not matter, either to Vcc or Ground (as these control the unused switches, but could still mess things up when unconnected). _________________ Jan
also .. could someone please turn down the thermostat a bit.
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Posted: Mon Feb 05, 2018 5:24 pm Post subject:
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Maybe a resistor from the connection between C14 C4 and R15 to GND might also help a bit as it is a connected to a pretty high impedance.
But yeah, as blue hell said connect those floating pins. For the INH pin you could also built another oscillator with one of the unused
NAND gates and attach that to it. You'd probably want to add a switch to choose between the output of that and GND though.
Could go further and use a CD4052. Connect the outputs of the triangle oscillators to pins 3 & 13, connect different resistor values
to the other in/out pins (1,2,4,5,11,12,14,15) and connect those all together to C4. Than add 2 oscillators to the A & B inputs (with
optional switches). _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube Last edited by PHOBoS on Tue Feb 06, 2018 3:18 am; edited 1 time in total |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Tue Feb 06, 2018 12:50 am Post subject:
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PHOBoS wrote: | Maybe a resistor from the connection between C14 and R15 |
C4 _________________ my synth |
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kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
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Posted: Tue Feb 06, 2018 2:03 am Post subject:
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Great little Dronemachine! But you have to find some use for the leftover 4093 gates
Maybe you can build a nice LFO for the WSG Filter.. |
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Tue Feb 06, 2018 7:17 am Post subject:
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Thanks for all replies!
I'm going to try this.
As far as I understand it, the inhibit is a sort of on/off switch?
About the LFO:
That is a good idea.
I was wondering how I could make the WSG filter CV controllable.
If I would make a LFO for the cutoff, where would I insert it into the filter circuit? (cutoff control)
I've also thought about changing the oscillators to triangle outputs of the 4093 (with some amplification), because the 4049 OSC looses gain fast in higher frequencies.
see here for some fancy boutique models i've made of this project:
This one has multiturn pots for all oscillators, a range switch and a starve pot.
this one has the drone and a noise generator with touch contacts (and a mixer)
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kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
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Posted: Tue Feb 06, 2018 7:46 am Post subject:
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Beautiful. You can build an emitter amplifier circuit with a npn, and boost the analog signal of the 4093 or you just use another opamp. Look at this thread for adding CV input to WSG filter cutoff: http://electro-music.com/forum/post-387855.html |
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kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Tue Feb 06, 2018 3:09 pm Post subject:
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I grounded the inhibit & input B & C. looks like that did the trick!
(tested it for one hour, no problems anymore!)
awesome
Thanks for the help!
I'm going to design a new circuit with more features: (feature creeps)
-4093 triangle oscs (with cv inputs)
-extra squarewave option (2nd switch and mixed into filter)
-external inputs
-modulated clock (cv or extra osc) / PWM
-filter cv
-lfo
-maybe another switch IC (like the DG419)?
let's see how this will work out!
I mention the DG419 because I had some problems with this circuit on +12v (eurorack) A friend of mine told me the cd4053 might not work on this voltage. Does anyone have more info on this? |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Tue Feb 06, 2018 4:57 pm Post subject:
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re. the12V issue - this should just work. The switch is specified up to 18V or so, the INH B C issue might have worked out there differently. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
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Posted: Wed Feb 07, 2018 6:51 am Post subject:
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I breadboarded the 4093 triangle circuit and I have to say that I don't really like the sound of it. I really love this osc here, it is perfect:
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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CHRISKELLY
Joined: Apr 08, 2018 Posts: 103 Location: England
Audio files: 3
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Posted: Thu Oct 11, 2018 9:44 am Post subject:
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I can't help with your question but I just had to say what awesome looking synths you've built! |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Sat Oct 13, 2018 1:26 pm Post subject:
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I think that is a leftover from the adaption of the WSG filter I used.
(I left out the pot for the resonance)
if I leave out the 4.7k , the resonance setting changes a bit. there used to be a 500k pot there.
edit:
I've inserted a trimpot there now. to set the resonance.
those 2 resistors were working, but not really. a small mistake.. thanks for pointing it out! |
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