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Old 16th September 2009, 02:10 AM   #1
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Default Introducing Ventus

Ventus is a mostly discrete opamp.

This is a circuit designed for some DIY fun. It is based on the Diamante circuit I published a while back.

The front end is a folded cascode design and runs into a LME49600 buffer. The buffer is in the feedback loop.

A schematic is worth a thousand words.

It sounds excellent. It can drive low impedance headphones exceptionally well.

As shown it is a BAL/SE converter and take balanced input from DACs such as Buffalo or Opus.

I would suggest when using it in this way (Balanced to SE) you use a relay to shunt output to GND on turn off to prevent any turn off thump. The thump buster works well in this role.

The Ventus can also easily be setup as a classic non-inverting amplifier with single ended input. It also can be setup as an in inverting amplifier with single ended input.

Each module is a mono channel so It takes two for stereo, and they stack easily.

There is a pot to null output offset.

We have boards tested and parts are en route so these will be available very soon.

The board is tested and proven, and I love it. I have been listening to it for a week now.

Take a look.

Cheers!
Russ
Attached Images
File Type: jpg pcb_small.jpg (133.1 KB, 1887 views)
Attached Files
File Type: pdf schematic.pdf (36.6 KB, 534 views)
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Last edited by Russ White; 16th September 2009 at 02:33 AM.
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Old 1st October 2009, 08:38 PM   #2
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Looks cool, Russ! I look forward to it being available.

Is this what was originally known as the 'Ballsie Lite' or is that still coming?
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Old 1st October 2009, 08:39 PM   #3
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Hi,

It is a different cct. Ballsie lite is still coming.

Cheers!
Russ
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Old 26th October 2009, 04:31 PM   #4
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I plan on adding proper BAL to SE converters to my Buffalo 32s. Would you recommend Ventus or the Ballsie Lite for the purpose of driving power amps unbalanced?

Thank you in advance!
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Old 27th October 2009, 12:06 AM   #5
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Quote:
Originally Posted by chipzahoy View Post
I plan on adding proper BAL to SE converters to my Buffalo 32s. Would you recommend Ventus or the Ballsie Lite for the purpose of driving power amps unbalanced?

Thank you in advance!
Both ccts works very well for the task. Ballsie lite will be a bit easier to use since it has an output shunting relay built in.

My first choise for driving headphones would be Ventus.

My first choice into another amplifier would be Ballsie Lite.

Cheers!
Russ
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Old 27th October 2009, 12:34 AM   #6
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I am getting these kits ready, and am trying to decide on what to do with the LME49600.

Getting it properly mounted with a soldering iron is possible, but not easy, unless you are really good at SMD soldering. The large metal tab needs to be soldered completely to give good thermal conduction to the ground plane.

I could pre-mount them using solder paste and a reflow oven, but want to get some feedback from interested party's first.

Anyone?
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Old 27th October 2009, 02:21 AM   #7
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Quote:
Originally Posted by Russ White View Post
Both ccts works very well for the task. Ballsie lite will be a bit easier to use since it has an output shunting relay built in.

My first choise for driving headphones would be Ventus.

My first choice into another amplifier would be Ballsie Lite.

Cheers!
Russ
Thank you, Russ. Can we get an estimated release date for the Ballsie Lite?

Last edited by chipzahoy; 27th October 2009 at 02:26 AM.
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Old 27th October 2009, 04:38 PM   #8
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Quote:
Originally Posted by chipzahoy View Post
Thank you, Russ. Can we get an estimated release date for the Ballsie Lite?
Hopefully tonight.
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Old 19th November 2009, 11:17 PM   #9
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The Ventus Kits and Boards will be available in the next 24 hours.
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Old 28th November 2009, 07:22 PM   #10
HJL857 is offline HJL857  United States
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Hi Brian
are the ventus kits available ?
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