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Old 27th February 2013, 05:23 PM   #71
maxw is offline maxw  United Kingdom
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Ah OK. Then yes, just change the horizontal regulators for vertical ones using the replace tool.
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Old 28th February 2013, 06:50 PM   #72
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Hi me again....

I fixed the board area issue by changing the regulators to some verticals ones.

Here's a snapshot of the gerber results. I'm curious what some of you might about the spacing between the thick trace below the regulator. Is the spacing there too small. It doesn't appear to be less than the spacing between the traces and ground plane. The lowest horz. blue space is about 0.166 mm high.

I ran a board houses DRU file w/o errors.

Thanx for looking at it.

Chris
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Old 28th February 2013, 07:15 PM   #73
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by chris2 View Post
Hi me again....

I fixed the board area issue by changing the regulators to some verticals ones.

Here's a snapshot of the gerber results. I'm curious what some of you might about the spacing between the thick trace below the regulator. Is the spacing there too small. It doesn't appear to be less than the spacing between the traces and ground plane. The lowest horz. blue space is about 0.166 mm high.

I ran a board houses DRU file w/o errors.

Thanx for looking at it.

Chris
Just take care when you solder it so that you do not get a solder bridge.

0.166mm is very, very small (about 0.006"). It may pass DRU, but generally, such tight keep-away distances are reserved for high density digital boards with surface mount and ball grid arrays where sneaking traces between pins is an absolute necessity.

Also, board houses do make mistakes and I have seen occasional open traces, shorts, and bad vias. I have some recent boards where they simply missed one trace altogether.
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Old 28th February 2013, 07:59 PM   #74
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You should have 15 mils/ 0.3mm at least in isolation distance. It seems way to small now.
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Old 3rd March 2013, 12:06 PM   #75
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Thanx peranders...

I cleaned up the layout a bit and did a dru.

Eagle has a default of 10 mils. This passed so I changed the settings for objects, pads, drill/holes etc. to your suggestion of 15 mil's and it passed again.

Cheers,
Chris
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Old 29th July 2014, 11:53 AM   #76
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Hello,

I've built a very similar circuit adapted from Chris2's final design although I used an NE5532 instead of an OPA134.

I was having an issue with DC on the output of the NE5532 so replaced the 68R resistor with a 47uF cap and a 22K DC drain resistor.

The problem I've noticed is that there is a difference of between 20mA - 50mA (I built serveral circuits) on the + & - output of the DRV134. Any idea what may be causing this?
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Old 29th July 2014, 12:58 PM   #77
AndrewT is offline AndrewT  Scotland
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post your circuit.
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Old 29th July 2014, 02:45 PM   #78
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post your circuit.
Sorry, here you go...

Click the image to open in full size.

Last edited by Eastwood; 29th July 2014 at 03:03 PM.
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Old 29th July 2014, 04:31 PM   #79
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The input is taken from Douglas Self's Small Signal Audio Design
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Old 29th July 2014, 05:14 PM   #80
AndrewT is offline AndrewT  Scotland
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draw a sketch and post a pic.

The copyright is on his original drawing, not on your sketch.
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