Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Power Amplifier 180W RMS

Status
Not open for further replies.

Ave_Rapina

Full Member level 2
Joined
Jan 6, 2004
Messages
122
Helped
18
Reputation
36
Reaction score
4
Trophy points
1,298
Location
Po
Activity points
681
is 180w rms good

Here is an power amplifier that I build 2*180w RMs
The amplifier has Dc control protection/start delay , Power level using lm 3915
Fotos and schematics and pcb in here
Very good amplifier run more than 2 years in a bar without any problem.
Alimentation +-52V to +-60V capacitor 40000uf or 60000uf/63V low ESR
Second alimentation 12V for the protection and led bar.
All tensions can be outputed from the same transformer if you build one
I recomend an Toroidal one
The osciloscope image is at 60% of power mesured with an 8 ohm load but I can pull out all power becouse the resistor that simulates the charge goes in flame
In the osciloscope image the probe is 10x attenuated
The led bar is simple just use an lm 3915 not dificult
Soon I put the layouts and component side
Any question please advise
Regards
 

hti97088

Newbie level 1
Joined
Jul 25, 2006
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,285
good one
thanks

Added after 3 minutes:

i'm new member and need this circuit for very important and i don't know how can i get all this points to allow me to see files
can any one help me and send this files to me or to my email
thanks
 

Ave_Rapina

Full Member level 2
Joined
Jan 6, 2004
Messages
122
Helped
18
Reputation
36
Reaction score
4
Trophy points
1,298
Location
Po
Activity points
681
Hello
No problem send me an Pm with your email and I send you all the stuff
Regards
 

koosdoos

Member level 2
Joined
Jun 8, 2006
Messages
49
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,288
Activity points
1,614
Hi ,

Great circuit , do you have any futher details on this ?
I don’t suppose you have a write up on adjusting bias, and other construction info also how it sounds etc.

Thanks Alot !
 

Ave_Rapina

Full Member level 2
Joined
Jan 6, 2004
Messages
122
Helped
18
Reputation
36
Reaction score
4
Trophy points
1,298
Location
Po
Activity points
681
The sound is extremely good it has an good supension factor almost 180
You must not limited the power supplie to perform an good bass amplification.

The bias adjusting is almost regulated by the circuit you can see that not exist any cross-over distorcion.
The reason is that the power transistor are all Npn that why have similar caracteristics that dont need to be compensated very much.
The current is 90 mA.
The circuit has overload feedback and clip protection as you can see in the schematic
The output coil is an 18 spires of 1.5mm wire isolated with an diameter of 10mm
The coil of overload feedback is a single spire of the same wire and same diameter.
The drivers and the transistor of dc bias must be equiped with heatsink or acoupeled to main heatsink.
if you want to drive load of 2 ohm you can connect another pair of transistors with limiting resistor such as 0.01ohm for the current of each transistor be the same.
Power supplie must be configurated like the schematics or similar.
The layouts I will try to find then and posted here or make a new ones.
The input sensibilitie is around 200mv I think the generator in the photo confirms.
The distorcion is 0.09% and freauanci rage is 16Hz to 22kHz
The maximal current is 3.6 A
Regarding the construction the is not very much to say regarding if the person has knowlegment of build amplifiers.
In the image appears an non toriodal transformer but i recomend one for both channel or even better one for each channel. That depend the relation Quality/Price
I wiil make an new part list becouse this one is hand writed and my letter is very dificult to understand.
in the end of the weekend I complete all this an put another projects online.
Any further question dont hesitate contact

Regards
 

ahmed osama

Full Member level 6
Joined
Jul 18, 2004
Messages
352
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,296
Location
Cairo, Egypt, Egypt
Activity points
2,652
Great Work ...

but about "O/P PWR=2*180w RMs" at what input level (PWR) or in other word the PWR GAIN

indeed i don't know all around the world in commerical Amp & the hobbies one always says the o/p pwr and never speaks about the i/p

i mean it is so great that o/p is 180W but what if i need at least 90W in the i/p !!
and also about the distortion !!!


Maybe there is something i don't understand & wrong So plz any adivse me

thx all
& again Good Work
 

borloloy

Newbie level 6
Joined
Jan 19, 2006
Messages
11
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
1,325
Do you have a PCB design of the power supply unit? Thanks
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top