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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
help me with my lab?
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lkarty



Joined: Sep 12, 2005
Posts: 4
Location: detroit

PostPosted: Mon Sep 12, 2005 1:04 pm    Post subject: help me with my lab? Reply with quote  Mark this post and the followings unread

Hi -

I just finished wiring my soundlab - but it's not working.

I don't know if it's a grounding issue, but I can faintly hear it. I checked the wiring over several times and there doesn't appear to be any problems.

Also - it continuously oscillates.

I don't know what to do - any ideas? This is my first larger project. I'm having trouble with the troubleshooting Smile

Any ideas/hints would be great!

thanks
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Macaba



Joined: Jul 13, 2005
Posts: 160
Location: UK

PostPosted: Mon Sep 12, 2005 2:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you use the PCB version?

Things to check-

Solder shorts
Shorts between tracks as a result of incomplete etching
Broken track as a result of etching working TOO well
Component put in the wrong way round
Fried op-amps
Wrong value components (too high resistors?)
Power supply voltages are correct
Power is getting to all parts of circuit.

Just a few things.
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Clack



Joined: Aug 08, 2005
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PostPosted: Mon Sep 12, 2005 2:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

what are you listening to it with?
what do you mean by oscilation like a slow pulse or a tone?

have you tried replacing any of the the IC's? were the amp is?

you could check the jack see how its wired? ( I always do stupid things like solder it to the switching part or earth )

sorry its easier to pick at the simple things first Confused

you could have some dud soldering id check things with a multimeter
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lkarty



Joined: Sep 12, 2005
Posts: 4
Location: detroit

PostPosted: Mon Sep 12, 2005 3:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks guys -

maybe it's a fried op-amp.

I seem to be getting voltage throughout - but i'm not sure what voltage i should be getting?

I really don't see any shorts or ??

It's most definitely pulsing...
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Pehr



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PostPosted: Tue Sep 13, 2005 11:21 am    Post subject: Reply with quote  Mark this post and the followings unread

I had the same problem, but it was just the low-pass filter that was turned all the way down Razz
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Uncle Krunkus
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PostPosted: Wed Sep 14, 2005 4:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah,
definately check every setting as there are a number of ways you can get the SL to output nothing.
Also check the wiring of pots, especially the mixer section.
Don't overlook the possibility that you mis-read a resistor code. I still do it from time to time!
Good luck.
P.S. if you don't find it in the next couple of hours of investigating, re-post, have a break, and we'll get out the big guns!

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lkarty



Joined: Sep 12, 2005
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Location: detroit

PostPosted: Fri Sep 16, 2005 6:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the help!

Well - I checked the individual modules and I seem to be getting signals from them.

When I checked IC3 I wasn't getting a signal. (used an amp as a signal tracer)

I'm going to check the resistor codes tonight! I'll let you know what happened.
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Clack



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PostPosted: Fri Sep 16, 2005 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

some signals could be too slow to be audible, did you use a pcb ordered from the site?
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Wild Zebra



Joined: Apr 28, 2005
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PostPosted: Fri Sep 16, 2005 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you socket your IC's?

IC3 is the VCA

So if your not getting anything from it try and swap it out.

I've had bad IC's before

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lkarty



Joined: Sep 12, 2005
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PostPosted: Thu Sep 22, 2005 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

yes, i used the pcb from the site. I swaped IC3 - no luck. geez! what have i done wrong?

It's strange, all I hear is the LFO and oscillator2. I get a signal from OSC1 and Noise when I use a signal tester, but I dont hear them when I plug in the output jack - ??
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v-un-v
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PostPosted: Fri Sep 23, 2005 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I get a signal from OSC1 and Noise when I use a signal tester, but I dont hear them when I plug in the output jack - ??


Check your wiring!!! ---> Read post by Mosc a couple of months back!!
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v-un-v
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PostPosted: Fri Sep 23, 2005 1:27 am    Post subject: Re: help me with my lab? Reply with quote  Mark this post and the followings unread

lkarty wrote:
I checked the wiring over several times and there doesn't appear to be any problems.



When I say check wiring- have you checked whether the signal is actually flowing through your wire? Wire sometimes looks fine on the outside, but if it is of poor quality- it can be difficult to tell.
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Uncle Krunkus
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PostPosted: Fri Sep 23, 2005 4:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Check whether the signal tester shows Osc1 going into the mixer pot (for Osc1) if it does, check what's coming out (ie from the wiper of that pot) a faulty pot can literally disconnect the wipers from the track inside.
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Danno Gee Ray



Joined: Sep 25, 2005
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PostPosted: Sun Sep 25, 2005 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

I would also recommend you verify the ground connection of r-27. I just finished building my soundlab last night (pictures soon), and had a very similar experience to yours. My symptoms were a pseudo random oscillation / bleed through of LFO signal (free running) as well as a reversal of the main output potentiometer operation. That is to say when I turned down the output it went UP! This afternoon I looked at that part of the circuit and discovered that I had overlooked this connection. R-27 was "floating", as well as all the rest of the front panel pots and switches wired to it. I think I inadvertently discovered a new "chaos" mod for the thing (lol).

Hope this helps.
Danno Shocked Idea
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