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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Heterodyne Space Explorer
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TheOutsider



Joined: Mar 10, 2011
Posts: 13
Location: Osaka

PostPosted: Mon Mar 28, 2011 6:53 am    Post subject: photos of the beast Reply with quote  Mark this post and the followings unread

Here's the latest machine out of SWC Spaceyards... hehe..


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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Tue Mar 29, 2011 4:47 am    Post subject: Reply with quote  Mark this post and the followings unread

wow! that looks great!
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TheOutsider



Joined: Mar 10, 2011
Posts: 13
Location: Osaka

PostPosted: Sun Apr 10, 2011 2:59 am    Post subject: Yet another one... Reply with quote  Mark this post and the followings unread

The latest creation...

I've changed a few things: one cutoff pot instead of two (a mod of the WSG filter circuit), played with different capacitor values for the oscillators, and also experimented with a different way of soldering in which I stuck the diodes and resistors straight to the pots, but differently than I had before (it worked and is cleaner).

These things are addictive!!

http://www.youtube.com/watch?v=_DGeydhGe5Q?hd=1


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Mikmo



Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark

PostPosted: Tue Apr 12, 2011 10:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice device!

Looking at the schematic you posted i wonder about the osc 6 (lfo), it seems to be "grounded at both ends" what does it do ? What is ic connected to ?

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TheOutsider



Joined: Mar 10, 2011
Posts: 13
Location: Osaka

PostPosted: Wed Apr 13, 2011 5:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Mikmo,

It is indeed grounded at both ends. I don't know where I read it (possibly somewhere on this thread even) but this kind of 'LFO' works not by directly modifying the output of the oscillators, but by interfering with the way the other oscillators get power, since all of the oscillators are part of the same IC. If you watch the video I linked to, you can see and hear how the LFO wreaks havoc on the other oscillators, especially when the voltage is sagged. Actually, depending on the settings of the voltage sag knob and the LFO, something very unusual happens. When the sag is dropped to half or lower, and the LFO is set fully clockwise, the unit(s) produce almost white noise, which the red unit is doing at the very beginning of the video (sag=1/2, LFO=max). Later on, the LFO is dropped to about 1/2 (at around 1:45 in the video) which makes the oscillators cycle on and off. This cycling only happens when BOTH the voltage sag AND the LFO are dropped to about 1/2: if the sag is set fully clockwise, changing the LFO speed doesn't produce cycling, but works almost like a conventional LFO (although it is kind of subtle).

Sorry I can't offer a technical explanation... I'm not an expert on circuits by any means. All I can tell you is I like what it does. Hehehe..
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Repeater



Joined: Mar 19, 2011
Posts: 11
Location: Rochester

PostPosted: Wed Apr 13, 2011 5:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

TheOutsider wrote:
Mikmo,

It is indeed grounded at both ends. I don't know where I read it (possibly somewhere on this thread even) but this kind of 'LFO' works not by directly modifying the output of the oscillators, but by interfering with the way the other oscillators get power, since all of the oscillators are part of the same IC. If you watch the video I linked to, you can see and hear how the LFO wreaks havoc on the other oscillators, especially when the voltage is sagged.


Sounds kinda like the Cacophonator. Extra oscillators mess with the current draw, but don't get hooked up as sound sources. Cool idea.
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TheOutsider



Joined: Mar 10, 2011
Posts: 13
Location: Osaka

PostPosted: Thu Apr 14, 2011 12:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Repeater,

Yes indeed I think it may have been the Cacophonator that I 'borrowed' the LFO idea from. I must've looked at about 100 different pages on the Internet and the same amount of schematics before I mashed together my mixed up mess of a circuit. Love these things though! 2 more in the works right now.
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Mikmo



Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark

PostPosted: Thu Apr 14, 2011 5:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks.

technical explanation or not it makes totally sense Very Happy

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TheOutsider



Joined: Mar 10, 2011
Posts: 13
Location: Osaka

PostPosted: Thu Apr 14, 2011 7:01 am    Post subject: Reply with quote  Mark this post and the followings unread

I fired up all 3 of the machines I've built and recorded a little noodling session...

http://soundcloud.com/swcspaceyards/next-stop-andromeda
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jtrain



Joined: Aug 28, 2011
Posts: 1
Location: UK

PostPosted: Sun Aug 28, 2011 2:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Could someone link me to a schematic for the WSG resonant low pass filter? Been looking, can't find it.
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Just Say Noise!



Joined: Nov 14, 2011
Posts: 2
Location: Portland, Oregon

PostPosted: Mon Nov 14, 2011 5:28 pm    Post subject:  CMOS synth problems
Subject description: Want to add momentary switches to 40106 synth
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Hello,

I have been experimenting with adding momentary buttons to the Hetrodyne Space Explorer so it can be played "percussively" instead of "droning". However, depending on where in the circuit I add the momentary buttons, some strange problems have occurred. Perhaps someone can shed some light on what is happening and where/how to add momentary switches.

Location 1-
I inserted momentary normally open SPST push button switchs into the oscillator outputs (from pins 2,4,6, and 8 ) just before the "S2, S3, S4 and S5" toggle switch locations as the schematic shows. When the newly added momentary buttons are pressed, the oscillator signal is heard loud and clear but when the button is released it is not completely silenced. You can still hear the oscillators humming away, although faintly. I would assume that the oscillators would be completely silent if the output signal path is disconnected, but this is not the case. I thought it was just a breadboard bleed through problem but I have soldered the circuit onto a pcb with components and put it all in an enclosure and can still hear the oscillators faintly.

Location 2-
I have found that when inserting a momentary normally open SPST push button switch in the feedback loop between, say pins 1 and 2, that it stops the oscillator completely, which stops the faint bleed through problem. But this set-up causes a new problem, which is: When the oscillators are being mixed through the diodes rather than the resistors, and the new momentary buttons are pressed, random volume drops and signal cancellations happen between the different oscillators (not the clipping/gating effect that the diodes normally produce). However, when the oscillators are mixed through the resistors this phenomenon does not happen.

Just to restate my question:

When I add momentary buttons to the oscillator outputs, the oscillators can still be faintly heard when the buttons are in the "off/open" position. When I put the momentary button between pins 1 and 2, random volume drops and signal cancellations happen between the separate oscillators when mixing through the diodes. Where/how do I add momentary switches to the circuit?

Thanks for any help!
Jason
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Blue Hell
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Joined: Apr 03, 2004
Posts: 20571
Location: The Netherlands, Enschede
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PostPosted: Mon Nov 14, 2011 6:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry to not be of any help, but wanted to say ::

Welcome Jason "You are home!" ( nice site you have! Laughing )

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jean bender



Joined: Feb 21, 2010
Posts: 133
Location: france

PostPosted: Tue Nov 15, 2011 1:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi everybody !
I've got a question... Need some explanations !

On The outsider schematic, we can see that the pwm oscillation is built around a 4148 diode. Could someone explain me why we need this diode ? in an electronically way ? It's a bit of theory that i don't get yet.

Thanks for any answer !
Smile

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Kabzoer



Joined: Feb 07, 2011
Posts: 82
Location: Belgium

PostPosted: Tue Nov 15, 2011 9:35 am    Post subject: Reply with quote  Mark this post and the followings unread

the feedback resistor determines how fast the capacitor charges,
a diode+resistor in parallel (pointing towards the capacitor) makes it charge faster in the on state,
but when it's in the off state, it will discharge at normal speed, as if the resistor+diode are not there.
The opposite will happen when it points towards the output.
This change in speed in either the off or on state will make that state shorter = pulse width

Hope I'm right on this, but that's how i assume it works...
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jean bender



Joined: Feb 21, 2010
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Location: france

PostPosted: Mon Nov 21, 2011 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Kazboer !
Thanks for your answer, it now takes sense for me !
great !

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Kabzoer



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PostPosted: Mon Nov 21, 2011 9:41 am    Post subject: Reply with quote  Mark this post and the followings unread

jtrain wrote:
Could someone link me to a schematic for the WSG resonant low pass filter? Been looking, can't find it.


Here is is, I made everything that doesn't belong to the filter brighter full details on his site: http://bit.ly/uXRemx

Just Say Noise! wrote:
You can still hear the oscillators humming away, although faintly.


Maybe you can put a large resistor (100k or more) to ground after the switch, to make that it remains at ground, I did not test this but i think it should work...


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bikini-inspector



Joined: Nov 29, 2007
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Location: bremen

PostPosted: Fri Nov 25, 2011 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

jtrain wrote:
Could someone link me to a schematic for the WSG resonant low pass filter? Been looking, can't find it.


here's a stripboard layout i made some time ago, maybe it helps. Verified and in heavy use.

http://electro-music.com/forum/topic-47418.html

since i got a monotribe for my birthday, i feel the need for a better filter, though.
Did you look into MS-20 type filters? The one in the monotribe sounds real great!
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Just Say Noise!



Joined: Nov 14, 2011
Posts: 2
Location: Portland, Oregon

PostPosted: Thu Dec 29, 2011 4:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Kabzoer wrote:
Maybe you can put a large resistor (100k or more) to ground after the switch, to make that it remains at ground, I did not test this but i think it should work...



Thanks for the reply Kabzoer. I've tried the resistor to ground with several different values but the oscillator can still be heard, although it is a little quieter. I decided to try putting the momentary button in the feedback loop of the oscillator instead of on the output. I've attached a schematic of the circuit. With this setup, when the momentary buttons are pressed simultaneously, the oscillators drop randomly in volume or cut out completely. Any ideas why its doing this? I think a "transistor buffer" may be needed at the outputs, but I'm not sure how to go about it. Thanks for any help!


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garcho



Joined: Sep 28, 2011
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PostPosted: Thu Oct 04, 2012 10:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

I know this is almost a year old, but...
When I put N.O. momentary switches in circuits like these, it's between the input pins' caps and ground (for instance, pin 1 on a 40106 going through switch, into cap). Voltage regulators (78L05, for example) seem to help iron out a few glitches, but I've just started experimenting using those with the CMOS chips.

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