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Old 5th October 2012, 03:20 PM   #31
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Keep it going Mr. Harrison. Evette
Thanks Evette
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Old 30th October 2012, 07:06 PM   #32
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Hi all,

Looking for volunteers. Kindly lay out this amplifier for me.http://www.harrisonaudiolabs.com/Amplifiers/OPB/OPB.pdf I love your team work. Alex have you laid it out yet ? Has anyone seen Drowranger ?

kind regards,

Harrison.
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Old 30th October 2012, 07:24 PM   #33
lineup is offline lineup  Sweden
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OPB uses a clever design. Instead of trying to beat OPamp input with discretes, this amplifier uses opamp with very low distortion.
This is in my book a good idea.
The output uses some voltage amplification to give opamp a target within opamp supply range.

I have done an amplifier like that. Built it too. It sounded just fine. My output was running in pushpull Class A.
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Old 3rd January 2013, 10:38 PM   #34
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Default conceptual quick layout

Sample quick layout
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Old 20th January 2013, 08:24 PM   #35
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First try, far from complete, but can give an idea
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Old 20th January 2013, 08:41 PM   #36
evette is offline evette  Canada
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Looks Good. Evette
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Old 20th January 2013, 10:23 PM   #37
WSJ is offline WSJ  United States
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The layout looks great.
It would be great to add the +/- 15 volt zeners and resistors.
I also like the RCA connector for the input, see one on my Avatar.
Only $1.73 from Digikey.

901 Keystone Electronics | 901K-ND | DigiKey
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Old 22nd January 2013, 09:43 PM   #38
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First try, far from complete, but can give an idea
Thanks for joining us. The first step is all it takes for a great result to come up . To better handle the darling tons temperature control the quick layout has two specific bias control transistors on heat sink. Check the quick layout .

You could bring in the +/-15 onto board or you could extract it from the main supply. The quick layout uses the first option, this really depends on whats at hand. The heavy current tracks need to have their proper width
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Old 24th January 2013, 06:09 PM   #39
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Had some time for an upgrade


Regards,
Ronny
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Old 24th January 2013, 09:50 PM   #40
WSJ is offline WSJ  United States
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Had some time for an upgrade
Regards,
Ronny
The layout looks good. It would be great to have some unused pads to the left of the +/- 15 Volt connector to mount zeners, resistors and caps. It looks like enough space if the parts are mounted on end. I use 3-4 pad groups to allow 2-3 component leads and a wire to make a junction.

The top mounting holes look very close to the traces. I don't see the signal pad for the RCA connector.

Here is an example; the DIP package spacing is not needed for this application.
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