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Old 21st May 2003, 02:42 PM   #1
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Default Another GainKlone is alive and singing!

Click the image to open in full size.

My pair GainKlone mono block is alive and singing! Initial testing is very good, no hissing and huming. Good bass, a bit up front and not very at ease, will need some tunning.

I used the non-inverting configuration, with a 4.7uF ERO MKP input cap, input resistance of 50kOhm. I make the gain of the amplifier to be 13 (1 + 621k/49.9k). Temporary power supply is a +/- 22Vac transformer, IRF 40CDP100 Schottky Diodes as rectifier. Nichicon KZ 1000uF 50V along with Wima MKP10 0.22uF 160V by pass cap, another ERO MKP1839 1uF 160V bypassing the +Vcc and -Vcc.

Added two Nichicon KG 15000uF/63V to the power supply, do not like the effect, even more unrelax. Took them off. What else can I do to make it sound more relax?

Oh yes, "heat sinks" are also DIYed. I posted more pictures in my website, check it out.
http://www.geocities.com/overmindxx/


Regards,
SW Yeo

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Old 21st May 2003, 02:53 PM   #2
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Hi Yeo,

You had me worried there for a minute! "Singing" most of the time is used to indicate oscillations. Glad yours is OK!

Jan Didden
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Old 21st May 2003, 03:16 PM   #3
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Default it may be dense around here...

...but have you posted a picture?
I can't see anything, only two icons.
Anyway, you don't say what power op-amp you used.
Give us a clue.
And you can try the inverted Gainclone, maby that's the problem.
Or circuit layout.
Do you have the psu caps near the chips?
My Gainclone is not upfront...
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Old 21st May 2003, 03:29 PM   #4
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Default Re: it may be dense around here...

Quote:
Originally posted by janneman
Hi Yeo,

You had me worried there for a minute! "Singing" most of the time is used to indicate oscillations. Glad yours is OK!

Jan Didden
It is not "singing", but performing nicely.


Quote:
Originally posted by carlosfm
...but have you posted a picture?
I can't see anything, only two icons.
Anyway, you don't say what power op-amp you used.
Give us a clue.
And you can try the inverted Gainclone, maby that's the problem.
Or circuit layout.
Do you have the psu caps near the chips?
My Gainclone is not upfront...




I have problem uploading the pictures, I linked them from Pbase. Anyway, I tried attach the pictures again. The IC I am using is LM3875.

Regards,
SW Yeo
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Old 21st May 2003, 03:30 PM   #5
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Default Re: it may be dense around here...

Picture 2

Check out my website for more picture postings.
http://www.geocities.com/overmindxx/

Regards,
SW Yeo
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Old 21st May 2003, 03:55 PM   #6
fedde is offline fedde  Netherlands
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Wowie, from which planet are they ???

Nice.

1. Try swinging instead of singing
2. Try the inverting configuration WITH an appropriate resistor on the +input. (621 k in your config)
3. Try more gain. (eg. 20 k <-> 621 k)

Fedde
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Old 21st May 2003, 04:27 PM   #7
karma is offline karma  Canada
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looks great . your website is still down o now its up


how hot do thay get?
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Old 21st May 2003, 05:12 PM   #8
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Quote:
Originally posted by fedde
Wowie, from which planet are they ???

Nice.

1. Try swinging instead of singing
2. Try the inverting configuration WITH an appropriate resistor on the +input. (621 k in your config)
3. Try more gain. (eg. 20 k &lt;-&gt; 621 k)

Fedde
Swinging - learned
I just wonder what is effect of gain or the level of feedback on the sound for this amp. Will try to increase the gain.



Quote:
Originally posted by karma
looks great . your website is still down o now its up


how hot do thay get?

geocities - free web hosting, there is a limitation of web traffic of the website. It is free, what to do.

How hot they depand on the type of music is being played. If I am listening to pop with lots of bass, then it get a bit warm. For Jazz and classical, it will take about one or two hours of operation before a slight temperature rise can be felt with my hand. Of course, it will depend on the volume/output level. BTW, I am using the amps with Proac 2.5, which is not really a difficult load for the amps.

Yeo
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Old 22nd May 2003, 07:22 PM   #9
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Schematic of my amplifiers. Please advice.

Yeo
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Old 22nd May 2003, 07:25 PM   #10
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Talking upskirt view

the bottom view of the amp.
Yeo
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