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Old 18th December 2004, 01:41 PM   #131
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sounds grate!

Will there be a post gathering all info of the amp when you'v buildt and tested both boards?

regards
marius
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Old 20th December 2004, 08:10 PM   #132
Nexus is offline Nexus  Netherlands
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Default splif

Hello All,

about a year ago, I build the splif topology as added in the word file.

My opinion about it:
First I build an amplifier with just one pair of BJT's driving the speaker, however the damping was very low and so the bass tones were not "tight"". So I build another with 10 parallel pairs in the output. Attached the schematic.

I listened to it for about half a year, and didnot like the sound anymore, the amplifier simply is not linear, and this is audible.
instruments like a saxophone sound good, but the rest of the instruments simply do not sound natural.

I want to state that this is my personal opinion, maybe someone else thinks different about this.

Best Regards:
Nexus
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Old 27th December 2004, 10:15 AM   #133
quasi is offline quasi  Australia
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Default Final Schematic;

This is the final schematic of the amp module. Two modules have been built and it is time to assemble the complete amp.

The major changes to the design are;

1. The split supplies have been removed and common rails feed the whole amp.

2. The cascode transistors have been removed from the input stage and replaced with a current mirror (Q4 & Q5). This change has been made to ensure symetrical current flows through Q2 & Q3.

3. Removing the cascode stage has required high voltage transistors for Q2 & Q3. I have settled on 2SC1845. These are low noise transistors with Vce of 120 volts.

4. Some resistor and capacitor values have been changed to try and achieve a balance of noise, distortion and thermal peformance.

There are other improvements that can be made to this schematic and these will be implemented at another time. But this is the schematic that will be put to service in the completed amplifier.

Many forum contributors will see their suggestions in this schematic and to you I say thankyou.

Cheers
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File Type: pdf schematic design_ n-mos5.pdf (34.6 KB, 1671 views)
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Old 31st December 2004, 04:29 AM   #134
quasi is offline quasi  Australia
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Default Proposed layout;

This will be the layout of the amplifier. There is some rooom leftover for further additions (clipping indicator, rail monitors fault conditions etc.)

Now I have to make the case.

Comments welcome of course.

Cheers
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Old 31st December 2004, 06:22 AM   #135
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GOOD JOB QUASI
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RL
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Old 31st December 2004, 05:33 PM   #136
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quasi

REAL GOOD JOB. I REALLY ADMIRE YOUR WORK. FROM THE VERY
BEGINNING TIL THE FINAL DESIGN
WHAT A NICE JOB.



HIENRICH
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Old 1st January 2005, 01:15 AM   #137
quasi is offline quasi  Australia
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Default Thanks hienrich, demogorgon & rajeev;

Thanks heaps for your compliments. This has taken a long time but it's getting closer to the end.

When it is finished I will post all the ccts and layouts for anyone who is interested.

During this exercise I have found areas that can be improved but the board layouts don't allow this easily. Even so the amp as it is performs very well, is very quiet and clean.

I will attempt some specifications when the case is finished and all the components are fixed.

The best part about this amp is that it has been built using mostly second hand parts found in junked electronics (power supplies etc.) or parts recycled from other projects. To date the whole project has cost under $100 AUS ($75US) and I have everything I need for the case.

Thanks once again for your kind thoughts.

Cheers & Happy New Year
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Old 1st January 2005, 05:22 AM   #138
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quasi,

IM SO INTERESTED WITH YOUR WORK. I'LL JUST WAIT FOR FURTHER DEVELOPMENTS . I HOPE YOU'LL POST IT WITH EVERY DETAIL.




HIENRICH
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Old 1st January 2005, 01:49 PM   #139
Did it Himself
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heinrich,

No need to SHOUT

(Using capitals on the internet in email or forums is counted as bad practice and is taken as shouting)
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Old 1st January 2005, 04:25 PM   #140
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Arrow Happy New Year

Hi QUASI COMPLEMENTARY,

You have done a great and fantastic JOB,

cheers,
Kanwar
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