Simple 100W power amp

[sudhir kumar]

Originally Posted by sakis

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 .....

hi sakis,
its not a DNA issue..big amplifiers are too esxpensive: true...but not a local problem..simply, we are new in this world and in starting everything is crude,big,blunt and powerful .Later it will be sophisticated,delicate,accurate and so called audiophile.Believe me when you are listening a 2000 watt rms audio system you are more inclined to feel thump than detecting it class ie.A,AB or B.At least my ears can not differentiate between classes of amp on higher volumes.
thanks

[Aniket]

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

[formula 22]

Originally Posted by Aniket

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!

[Aniket]

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

[wintermute]

Originally Posted by Aniket

@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.

[sakis]

Originally Posted by sakis

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

[djk]

Being thin skinned and seeing insult when none is intended, it's a politically correct world we live in.

[Aniket]

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

[emmi]

Originally Posted by AndrewT

Our Indian subcontinent Members have been reading too many Car Audio magazines.

Here in India we use these speakers

Ahuja Sound Solutions

[Aniket]

And I use these speakers. Images attached.