100W Audio Amplfier By Smart Kit

[faizanbrohi]

Hello ..

I am really worried , i am going to buy tommorow , the orignal transistors . but please reply soon audioguru that is the high current of R2 And R16 because of the Transistors . and if i replace them will it work . Plzzzz .. help .. and lastly will it give any signal if R2 And R16 are hot . thnxx plzz ....  ??? :'( :'( :'( :'(

 

[audioguru2]

I am really worried , i am going to buy tommorow , the orignal transistors . but please reply soon audioguru that is the high current of R2 And R16 because of the Transistors, and if i replace them will it work? .. and lastly will it give any signal if R2 And R16 are hot?

R2 and R16 will not get hot if the pot is adjusted for an idle current for the amplifier of only 50mA. They will heat normally if the amp is playing loudly.
Many parts affect the current through R2 and R16, and the current through Q1 and Q9. The current source Q10 is supposed to provide 7mA so see if you measure 0.7V across R25.

Use the proper high voltage darlington transistors BDW84D for Q1 and BDW83D Q9 then maybe the amplifier will work properly. BDW84C and a BDW83C darlington transistors will also work fine.

 

[faizanbrohi]

The thing is why is it drawing so much current , Q7 is working fine , Q6 is working fine , everthing seems to be fine , what is the problem .... Can you brief me about the theory behind the operation of this amplifier . plzz ...thnx ... :'( :'(

 

[faizanbrohi]

AudioGuru can you give me any working 50W-60W amplifier schmatic and PCB Layout with 4ohm @60W speaker output with volume or base adjustment . plzz i need it soon ... The one's you have made and are working great .. plz .. i have to submit a project in about 2 days please help.....  :'( :'( :'( :'( :'(

 

[audioguru2]

There is a very simple 60W Guitar Amplifier in our projects section that isn't very high-fidelity: http://www.electronics-lab.com/projects/audio/031/index.html

There are many good amps on this site:  http://www.sound.westhost.com/projects-1.htm

I hope you can find the parts in your "market".

 

[faizanbrohi]

Forget about making an another amplifier . i will make this again , i will buy new components. ok and will make new PCB and please tell me the site where i can get info on getting the Inductor Value of 0.5mm wound around a resistor of 1W with 10 turns . is there a calculation , please i need to know the value in order to get the inductor right. now please help me on the inductor plzz ... i will do all the PCB Again. plz help on the inductor , i want it's value. and if possible a very
equivalent substitute for BD829 BD830 and BDW84D and BDW83D

 

[audioguru2]

You don't need to know the value of the inductor, just make it like it says.
I never had to substitute anything since in Canada I can buy anything I want. Maybe another member has a transistor substitution guide and can help you.

 

[faizanbrohi]

Who is this member you are talking about audioguru that has replacements

 

[audioguru2]

You need a substitution guide book.
Go to the website of a transistor manufacturer whose transistors are available in your area. Maybe they have a substitution list.

 

[faizanbrohi]

Can you Tell Me the Theory behind this Audio Amplifier . plzzz

 

[audioguru2]

The "how it works" section of the project explains its theory clearly.
Read about how transistors work in our Articles section.