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Old 12th February 2009, 04:18 AM   #1091
jermo is offline jermo  Canada
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Default update

sorry to double post,
I hadn't tried turning my amp up to max so I just did that and I could hear the record extremely faint, substantially less volume than it has without the vsps.
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Old 12th February 2009, 04:35 AM   #1092
rjm is offline rjm  Japan
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Quote:
Originally posted by fluffhead
Even without the opamp in the socket there is some hum/hiss, what does that mean?
Phhft ... well, at a guess that means you have the VSPS chassis connected to earth, and your amp is connected to earth, so you get a ground loop.

If the VSPS isn't earthed, then the situation is more complicated.
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Old 12th February 2009, 04:47 AM   #1093
rjm is offline rjm  Japan
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Default Re: No sound

Quote:
Originally posted by jermo
So I wired everything up for the VSPS and plugged it in and no sound comes out! what process can I go through to troubleshoot?
Is today "my-VSPS-doesn't-work" day or something?

First thing is to substitute another phono stage into the system to check everything else works.

Second thing is to double check the voltages at the opamp power pins.

Third thing is to replace the opamp.

Fourth thing is to check continuity between the RCA jacks and the PCB.

Fifth thing is to look for the obvious, idiotic thing you forgot to do. (Posting a photo to the forum may prove helpful.)
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Old 12th February 2009, 06:38 AM   #1094
jermo is offline jermo  Canada
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Default voltages

the voltages are right, 24v difference between the two so there's +12 and -12 going into the thing, the op amp is brand new so I don't know why it wouldn't be working.

It may be my VSPS doesn't work day, either that or a chemical engineering student is attempting to wire up an amp and has no idea.

I would send you a photo but I've done the wiring in a very very messy way so I doubt it would help. I just followed the PSB drawing when wiring everything up. and I used wires not a PSB. I didn't use 24 ga I just took some copper lockwire that I had handy and spun two strands together, it looked like just over .5 mil so I assumed it was fine. I doubt that would be doing this though they would just be heating up if they were too skinny.
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Old 12th February 2009, 07:38 AM   #1095
rjm is offline rjm  Japan
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Default Re: voltages

Quote:
Originally posted by jermo
the voltages are right, 24v difference between the two so there's +12 and -12 going into the thing, the op amp is brand new so I don't know why it wouldn't be working.
Are you are using the NE5534 with the stereo board layout by any chance?
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Old 12th February 2009, 08:00 AM   #1096
jermo is offline jermo  Canada
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yeah that's what I'm doing
Click the image to open in full size.
where c2 is a bank of 3 caps, pretty much followed the directions to the tee, even got the 105k and 732k resistors.
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Old 12th February 2009, 08:20 AM   #1097
juluska is offline juluska  Ukraine
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photos please
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Old 12th February 2009, 08:37 AM   #1098
rjm is offline rjm  Japan
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I was hoping you'd catch on yourself before posting that.

You are using a single channel op amp. You need a dual channel opamp in stereo layout, such as the NE5532.

From the web page:

"Any audio op-amp could be used with satisfactory results. Stereo layouts require dual op-amps e.g. NE5532, OPA134."

and again, right above the figure you just linked to..

"Below is an example layout for a basic stereo version using a dual op-amp (NE5532, OPA134). "

So it's not like I didn't tell you.
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Old 12th February 2009, 09:24 AM   #1099
rambojj is offline rambojj  Germany
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After building the VSPS I am interested in building a Phonoclone.
The RIAA Caps are not the same as the caps from the VSPS. There I used 4 x 1nF per Channel and 732kOhm, 100kOhm + 4,99kOhm and 2,2kOhm for the RIAA. At the Phonoclone there are 2.90nF RIAA (2.2nF||0.68nF). Why?
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Old 12th February 2009, 12:13 PM   #1100
rambojj is offline rambojj  Germany
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Sorry, rjm. But OPA134 is a single Op Amp. OPA 2134 is dual.
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