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ASM-2
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sneakthief



Joined: Jul 24, 2006
Posts: 569
Location: Berlin

PostPosted: Fri Sep 22, 2006 8:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
How are the references you put into them derived? Did you use the +/-10V coming out of the LM329s
..snip...

yes, that's exactly what i did. i have to admit, the +/-10v reference hasn't been tweaked yet: it's at +10.43v and -10.46v. i wonder if this is the problem.


Uncle Krunkus wrote:

BTW, yes, wiring will be happening ASAP, and probably for a long time! Laughing


oh it's not so bad - well, as far as i can remember Smile

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Uncle Krunkus
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PostPosted: Fri Sep 22, 2006 2:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

No, the main thing is that it's stable. Being out by a little bit wouldn't matter, as long as you callibrate to that, it shouldn't change.
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Uncle Krunkus
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PostPosted: Mon Oct 16, 2006 5:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Okay, so I've started wiring up. I've never been so excited about the prospect of listening to a sine wave! Very Happy
I came up with the idea of doing multiple shielded signal runs using USB cable. I found about 8*2m ones in my junk box which I got given when I was at Jaycar. They are literally 4 conductors inside a really good foil and braid shield. Does anyone know any reason why I shouldn't use them? The main thing I wanted them for was to bring my Sqr/Tri/Saw/Sine outputs up to the selector switches, but do I need to worry about crosstalk? I can't imagine I do with signal levels like that, but what do you dudes think?

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deknow



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PostPosted: Mon Oct 16, 2006 4:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

uncle k,

if it's really differant wavforms from the same oscillator, i really doubt a little crosstalk would even be noticeable...after all, wouldn't they all be in phase all of the time?

deknow
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Uncle Krunkus
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PostPosted: Tue Oct 17, 2006 5:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, I realised today that I told someone else (zipzap?) here that they only needed to worry about shielding the noise cables. So I've kind of answered my own question really.
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Uncle Krunkus
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PostPosted: Sun Oct 22, 2006 7:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Here are the latest pics.


ASM2-j.jpg
 Description:
Here's the case finished. It turned out solid as the proverbial brick shithouse!
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ASM2-j.jpg



ASM2-k.jpg
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Front panel, half dressed.
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ASM2-k.jpg



ASM2-l.jpg
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What's inside, with the oscillators half wired up.
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ASM2-l.jpg



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dnny



Joined: Mar 12, 2005
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PostPosted: Sun Oct 22, 2006 8:36 am    Post subject: Reply with quote  Mark this post and the followings unread

looking good.
banana

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toybox



Joined: Aug 03, 2005
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PostPosted: Sun Oct 22, 2006 1:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

looks like it's going to be super nice!!!
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sneakthief



Joined: Jul 24, 2006
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PostPosted: Mon Oct 23, 2006 2:16 am    Post subject: Reply with quote  Mark this post and the followings unread

fantastic! i can't wait to see how you wire it up Smile
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Joel



Joined: Sep 12, 2006
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PostPosted: Mon Oct 23, 2006 4:20 am    Post subject: Reply with quote  Mark this post and the followings unread

awesome work, can't wait for the sound samples Shocked

do you have a big pointy wizard hat to wear while you play it?
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Uncle Krunkus
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PostPosted: Mon Oct 23, 2006 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey Sneakthief,
I've just finished wiring the VCOs, and I've realised that I need to do some fine tuning of the +/-10V reference. R1 & R4 were originally s'posed to be 267R and 287R (not sure why) now the updated schem shows them as 270R. I'll change them to be matched 1%, and the 1K5s, for which I used 5% carbon, I'll be changing to 1% as well. Laurie says on that schem to adjust the 1K2s for perfect +/-10V so I'm going to put in 200R 25 turn trimmers in series with 1K1s 1%. Aside from that everything seems to be working fine.

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Uncle Krunkus
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PostPosted: Mon Oct 23, 2006 4:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Of course not! People who build the "Wizard" wear wizard hats!
http://www.elby-designs.com/asm2-wizard/asm2-wizard-about.htm
I have a very impressive Sorcerer's hat to wear.

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Joel



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PostPosted: Mon Oct 23, 2006 5:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, my mistake Embarassed

(off to build the ASM2-Dunce.....)
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sneakthief



Joined: Jul 24, 2006
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PostPosted: Mon Oct 23, 2006 5:32 am    Post subject: Reply with quote  Mark this post and the followings unread

still haven't calibrated my +/-10v reference yet... i swear i'll get around to it!

ps. i heard the ASM-2 Dunce hat is easy to make Wink

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questionable



Joined: Aug 27, 2006
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PostPosted: Sat Oct 28, 2006 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

any bleeps and/or bloops out of that thing yet?
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Uncle Krunkus
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PostPosted: Sat Oct 28, 2006 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yep,
I've got the oscillators running. I need to work out a problem with the V/Oct tracking, then I'll move onto the VCFs. I'll post some samples as soon as there's something decent happening.

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sneakthief



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PostPosted: Sat Oct 28, 2006 2:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

re. v/oct tracking - Laurie's instructions didn't work at all for me. Since both of my vco's have the same issue, I think there's something fishy but I haven't quite figured it out yet.

Let me know what kind of calibration issues you're dealing with. I want to get to the bottom of this too.

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Uncle Krunkus
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PostPosted: Sat Oct 28, 2006 3:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

sneakthief wrote:
re. v/oct tracking - Laurie's instructions didn't work at all for me. Since both of my vco's have the same issue, I think there's something fishy but I haven't quite figured it out yet.


The problem I got was that with a CV of 5Volt I couldn't adjust the V/Oct trimmer to get 5 Octaves difference from the original frequency. I could only get just over 3. Is this what happened for you too?

The newest update of the schem shows 2*TL084s in each VCO, now, even though my original BOM shows TL084s, for some reason I've got two LF347s installed. I put them in ages ago so I've forgotten why that is different. What quad op-amps have you put in yours?

I've already e-mailed Laurie about it, and I'll keep you informed about the fix. Apart from this, it sounds really good, and the waveforms are very close, without me even doing any shape adjustments yet. I'm sure it's something simple.

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sneakthief



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PostPosted: Sun Oct 29, 2006 12:55 am    Post subject: Reply with quote  Mark this post and the followings unread

I've got 2 tl084's per vco. My problem is that when I use 5v on the cv-input (with nothing else connected), I can get the proper frequency, but the tracking is wonky.

That said, I can still get several octaves of decent tracking, just not as many as was claimed. As I said before, I think this might be related to my +/-10v reference not being calibrated yet.

cheers,
michel

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Uncle Krunkus
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PostPosted: Sun Oct 29, 2006 2:44 am    Post subject: Reply with quote  Mark this post and the followings unread

I checked the datasheets for the LF347 and the TL084 today, and the large signal gain for the 347 is 100 V/mV whereas the 084 is 200 V/mV. I'm pretty sure that's my problem sorted out right there, but I'll see what Laurie reckons.
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sneakthief



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PostPosted: Sun Oct 29, 2006 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

just got a message from Laurie: seems that TL074's may be the way to go for the exponential converter (instead of a tl084). i'll try this it and report back how it works.
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sneakthief



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PostPosted: Mon Oct 30, 2006 4:36 am    Post subject: Reply with quote  Mark this post and the followings unread

I changed over the exponential converter opamp to a tl074 and I now get good tracking over 5 octaves. Great!
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Uncle Krunkus
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PostPosted: Mon Oct 30, 2006 5:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool, I'm glad your problems sorted.Rolling Eyes Laughing
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sneakthief



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PostPosted: Mon Oct 30, 2006 8:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Cool, I'm glad your problems sorted.Rolling Eyes Laughing


Well I built mine first! heheh. And to not make this post a total waste, I just finished wiring my 2nd SN-Voice *yeehaa*

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Uncle Krunkus
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PostPosted: Sat Nov 11, 2006 6:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Both VCOs and VCF1 wired up and running really well.
It turns out that I had some old component values and a couple more things to sort out with this "prototype" board I got. I've tracked it all down and sorted it out. I definately feel like I'm learning more and more as things progress.
I've got to get some modulation sources happening! Very Happy Rolling Eyes

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