Yet another amp - simple inverted with 10x gain, mosfet output stage - Page 7 - diyAudio
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Old 8th August 2011, 09:31 AM   #61
mkc is offline mkc  Denmark
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Hi Sonnya,

Nice looking boards. I have tried to contact you by PM and email, but without luck. Could you please PM me?

mkc
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Old 8th August 2011, 09:38 AM   #62
sonnya is offline sonnya  Denmark
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I have send you an email.
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Old 21st September 2011, 09:51 PM   #63
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by lineup View Post
Could be a well sounding amp. And still close to Hifi.
After a test today it is a well sounding amplifier.... It is confirmed by 3 other people now...
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Old 9th November 2011, 02:50 PM   #64
mikelm is offline mikelm  England
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Default Some SPICE Play

Well Sonnya,

I hope you excuse me, but after the talk in the SSA thread about the sound of 1000V / uS, I had some fun with your very elegant design, which I really like.

I had a vision of having balanced pairs of these taking the current o/p from my Buffalo DAC . . . . but before I got into that I could just try driving into the 100R input resistor from IVY - which can drive headphones.

In real life I would begin with your design and try each mod one at a time see how each change sounded - but there is nothing that revolutionary just regular measures.

I would be interested to compare this with with my DC linked version of Motzilla

cheers

mike

p.s. would probably have regulated + & - 30V for early stages
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Old 9th November 2011, 06:46 PM   #65
sonnya is offline sonnya  Denmark
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He! It sounds Like you are going to build a powerdac?!

You could easely use it directly from the dac's current output. It is a good idear to do as you have done. The buffer stage before the exicon lowers the distortion at higher frequency.

In the revised layout i am working on the last days i have added ksc3503 and ksa1381 as a bufferstage, and this at the same time gives lower distortion at lower idle current in the exicons.

I am happy to hear that you would Like to experiment with it.

If it has your interrest it Will be available within a week or two. I would Like to hear your comments too.

I know this section is not comercial but i have paid for such a section and Jason has made All the preparations for it, so it is only me who to find time to get it ready.
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Old 9th November 2011, 10:11 PM   #66
mikelm is offline mikelm  England
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Your comments & circuit gave me the idea for powerdac - it's most minimalist so I like the idea.

Also reducing value of FB resistor decreased distortion very much.

I will probably experiment initially with point to point . . .

but for now I will be travelling for 1 month so I look forward to pick this up after I return.
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Old 10th November 2011, 05:04 AM   #67
sonnya is offline sonnya  Denmark
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Have a nice trip Mike...
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Old 15th November 2011, 10:52 AM   #68
loek is offline loek  Netherlands
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Quote:
Originally Posted by mkc View Post
Hi Sonnya,

I have tried to contact you by PM and email, but without luck. Could you please PM me?

mkc
Hi Sonny, i also tried to contact you by PM. I know you are busy and maybe you missed my mail about transistors ....
Regards,
Loek
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Old 3rd March 2012, 09:00 PM   #69
sonnya is offline sonnya  Denmark
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THD measurements.

All THD measurement at 1W the amp is running in class A.
THD at 1KHz@1W is masked by EMI from powersupply.

At 8W the amp is outside class A. The performance at 10KHz and 20KHz is poor seen from the point of view that it is a feedback amp, but the THD falls nicely of.

The amp is not good at at handling crossover distortion which is the reason why distortion is a bit high at 10KHz and 20KHz.

But it is a simple amp which is easy to build.
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Old 28th March 2012, 05:17 PM   #70
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by mikelm View Post
Your comments & circuit gave me the idea for powerdac - it's most minimalist so I like the idea.

Also reducing value of FB resistor decreased distortion very much.

I will probably experiment initially with point to point . . .

but for now I will be travelling for 1 month so I look forward to pick this up after I return.
Hi Mikelm.

Are you start build your powerdac?
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