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Old 29th August 2009, 07:38 PM   #1
Electrons are yellow and more is better!
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Default DRV134 pcb

http://sjostromaudio.com/ubc01r0.pdf

I got inspired from someone (can you guess?) to make a DRV134 pcb with built-in regulators, two types of them and the discrete one can handle pretty high input voltage. The design comes right of my head and I haven't tested it in any way.
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Old 30th August 2009, 08:08 AM   #2
Electrons are yellow and more is better!
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The pcb look like this
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Old 30th August 2009, 08:09 AM   #3
Electrons are yellow and more is better!
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... and this
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Old 5th September 2009, 04:04 PM   #4
Electrons are yellow and more is better!
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I thought about to have SMD opamps on the solder side along with 0.1% resistors. It's not impossible to fix this. Is there any interest for this? For building a DRV134 solution you'll need three opamps and a dozen of resistors but they have to be with tight tolerances in order to get good performance.
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Old 9th September 2009, 04:19 PM   #5
AndrewT is offline AndrewT  Scotland
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does the DRV need a input offset current feed resistor?

Why exclude the possibility of using balanced input?

Do other balanced opamp drivers fit the pin configuration of the DRV134?
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Old 9th September 2009, 06:28 PM   #6
Electrons are yellow and more is better!
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This is a unbalanced to balance driver. If you already have a balanced signal you won't need this converter but I see what you mean. You could use a balanced opamp like OPA1632.

As I see it you can connnect the DRV134 via a cap only. I haven't it though. Anybody who has?

You have a THAT chip which is compatible.
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Old 10th September 2009, 09:56 AM   #7
Electrons are yellow and more is better!
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Quote:
Originally Posted by peranders View Post
..I haven't it though.
...tested it...
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Old 25th September 2009, 12:54 AM   #8
Shaun is offline Shaun  South Africa
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Hi Per-Anders

Do you have more of these PCB's? I need two.
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Old 25th September 2009, 05:14 AM   #9
Electrons are yellow and more is better!
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I will have pcb's in a few days.
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Old 7th October 2009, 01:29 PM   #10
Electrons are yellow and more is better!
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I have debugged the boards now and two errors were but the were minor.

Connector X4 should be +V GND -V, (is +V GND -V, just swap + and -)

Connector X3 should be -OUT (inverting output)

Connector X2 should be +OUT (non-inverting output)

It was right to connect the input coupling cap directly to pin 4 without any pulldown resistors.
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