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Old 22nd July 2012, 05:37 AM   #41
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Quote:
Originally Posted by Aniket View Post
thanks formula 22,

you made my amplifier even better, i would do the changes and mention the results later.
Earlier in the original circuit i set the bias to 25mA, output shows only 1mV, amplifier is dead quiet, no hum, no hiss.

what could be the ideal bias setting as you have included a trimpot in the schematic you updated.

Regards,
Aniket
Hi Aniket!
BC139 for bias should be on the refrigerator (heatstink) with a 2N3773 or MJ15003 and the best with MJ15022 or MJ15024!!.
Quiescent current with 2k2 trimmer set at about 50mA.
Amplifier great works with these changes I have indicated in the schematics!!
2N3773 replacement with MJ15022 or MJ15024 and BD139 and BD140 replacment for MJE15032 and MJE15033!!
BD139 for bias remains.
Best regards and Cheers!

Last edited by formula 22; 22nd July 2012 at 05:50 AM.
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Old 22nd July 2012, 12:11 PM   #42
Aniket is offline Aniket  India
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Thanks formula 22

i could do the changes you mentioned but genuine MJ15024 or MJ15003 are hard to find here. MJE15032/33 are sacred too, I would ask a friend who lives in Bangalore(Electronics City of India) if he could find there and make these mods.
I used TIP122/127 as drivers and they worked fine also.

Regards,
Aniket
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Old 22nd July 2012, 12:53 PM   #43
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Quote:
Originally Posted by Aniket View Post

@sakis- if you dont want posts originated from India then better not watch and post irrelevant to the subject or theme. I be a member of DIY to learn a lot and share little that i know.
Do you own DIY or DIY audio belongs to you. It seems a problem for you from where a member belongs. You should encorporate a filter or moderator not to allow people from India to be a member of DIY. I know that DIY is open for everyone no matter where you are from. I came here to learn, dont make this a bitter experience.
whist I do not think that sakis was being malicious with his post, he has been given points for it. We are a multicultural forum and as per rule 9. discussion of ethnicity is not allowed. Posts from all races and nations are welcomed provided they follow the rules and the spirit of the forum.
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Old 23rd July 2012, 08:12 AM   #44
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Originally Posted by sakis View Post
i love statistics

I wonder if any moderator could actually "wash" through posts that originate from India where 9 out of 10 ask for more power

Is it DNA issue??? is it a local problem??? ( big amplifiers are too expensive ? ) who knows ....interesting though .....

I have received an penalty for my post from moderation and i apologize if this sounded like any insult to any forum member I only wanted to point the power issue ....i Have no racist issues with any other people .

I apologize again if after all what i wrote was wrong by all means .

Kind regards
sakis
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Old 23rd August 2012, 05:10 PM   #45
Aniket is offline Aniket  India
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Default Upgraded my amp

upgraded my amp using 2 pair of output devices (now 2SC5200/SA1943 earlier 2N3773), and the result is fantastic, more clean tight bass, crisp mids and highs, and even could feel more power. Attached are the pics, would upload updated schematic later.

@Sakis: Dear Sir, no need to apologize, I was also a bit harsh too, i wish you could help me to learn here, as i am a beginner and maybe less than half of your age
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Old 23rd August 2012, 06:10 PM   #46
emmi is offline emmi  India
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Our Indian subcontinent Members have been reading too many Car Audio magazines.
Here in India we use these speakers

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Old 24th August 2012, 04:15 AM   #47
Aniket is offline Aniket  India
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And I use these speakers. Images attached.
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Old 24th August 2012, 04:28 PM   #48
Aniket is offline Aniket  India
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Default Updated Schematic

attached is the updated schematic, i did some changes, got 1mV at the output, and bias is set at 25mA, amplifier runs very cool, sounds great and punchy
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Old 24th August 2012, 04:36 PM   #49
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Nice, just a small bit of advice, add a capacitor over collector/emitter of BC546, about 470nF or so.
It will help stop the audio signal from modulating the Vbe bias voltage.

Regards
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Old 24th August 2012, 10:31 PM   #50
AndrewT is offline AndrewT  Scotland
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25mA across Re @ 0r2 is 5mVre.
This is exceptionally low, for an EF stage.
You may find that sound will improve by doubling and maybe quadrupling the output bias currents.
But, will your heatsink be big enough? 2pr @ 100mA and +-42Vdc, gives Pq~17W
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