200 Watt Lateral Mosfet Amplifier and irfp240/9240 (segue)

[nbcd]

hi pelle

that's a job well done.
Don't you have a closer picture of the PCB ?
-i also want to build the amplifier but i'm still having problems with the components from the PCB.It would help me a lot.
thanks.
All the best.

 

[Pelle]

nbcd:
The problem is that the pcb is bolted to the sink which is then bolted to the box, so I can't take any close-ups of the pcb.
What's the problem with the pcb? Is it the ratings of capacitors or wattage of resistors?

-Pelle

 

[nbcd]

hi pelle

pelle let me have that PCB layout and not only that but also a foto of it with the components mounted on it
thanks.
all the best

 

[Mattyo5]

Pelle...yeah please send me the pic of that pcb layout. Love to see it!

-Matthew K. Olson

mattyo5@aol.com

 

[nbcd]

re

thanks pelle you sent me just what i need.If i'll have any problems during the building process i will ask you later.
all the best

 

[HighTec]

Holton's 400W Amp

Hi guys.

I have the whole project(main board,soft start unit,VU display,DC fault protection unit,etc)
I've designed it in old Tango Pcb Dos, but I can convert it into P CAD 2002,so you must have this software to open it!
Since I made it 3 years ago any suggestions about the concept I will accept.
Regards.

 

[tino96]

for High Tec:

Can you convert the main board pcb in Jpg format?

( I don't have Tango Pcb Dos,or P CAD 2002)

 

[HighTec]

Layouts

Hi.

Ok,Iwill try to attach the images.Resolution is low so you'll not be
able to see the holes,pads etc.
First slide:Top silk(component placement)

 

[HighTec]

Layouts

And the bottom(copper side)view.

 

[tino96]

Wonderful work!
can you attach the whole project (in P cad 2002 format) at the forum or send to me
at:
tino96NOSPAM@inwind.it ?


many tnx in advance
(P-CAD 2002 Trial Version is 30 days full working)
P.s. remove NOSPAM to reply

 

[HighTec]

HI Tino.Thanks.
You have a mail.

There are questions about IC1.
It is a temperature sensor LM35DZ.Bellow is how to mount it.Fill the hole with thermal compound(not to much).The sensor must
touch the heatsink!

I can't attach the whole project here because of the limits.Files are 250kB compressed.
And one more thing...print the bottom layout only with a laser printer.
Regards.

 

[tino96]

Hi HighTec

Many tnx,
I have the construction notes for the symmetrical 400 watt amplifier of Anthony.E.Holton
Revised Schematic
(C)Copyright 1994-99
LAST REV.01/06/1998
and there isn't an IC1 for temperature sensor LM35DZ.
Your pcb work is for this realase?
I'm in mistake?
Bye

 

[HighTec]

Hi Tino.

The basic is same,but I've made some major changes.The components are not under the same designator like in Holton's
schematic.
I've added the circuit with LM35 for muting the amp if the
heat sink temperature exeed 90 degrees Cel.The whole design is
adapted for professional needs(fans,XLR3 inputs etc.).
I'll send the whole schematics today or tomorrow.The guys from
Altium(PCAD) said that translating schematics from Tango Dos into
PCAD 2002 would be a piece of cake,but theory and practice are not the same.
Regards

 

[tino96]

hi HighTec.
wery well,
Iwait you
bye

 

[dexx]

Dont you find that a hexfet amp gets very hot even when idle?
Doesnt it waste alot of electricity?

Jim

 

[tino96]

I've draw the pcb of this amp, someone check the layout?
bye

http://web.tiscali.it/my.web.space

ftp://61.147.251.82/%F9p%20by/diy/Ampli%20mosfet.zip (hi res pdf format)

 

[tino96]

pcb in low res

 

[kea]

scematic

looks like you are using 2 differential stages in series. Is that right?
Are you using one pole compensation (looks like it)?

 

[AndrewT]

Hi Tino,
the output stage shows alternative devices.
Buz= lateral FET and works with the resistor bias control shown.
IRF=Vertical FET and will possibly/probably destroy itself without temperature compensation of the bias current.

 

[kea]

why has this thread died? It sounds very interesting...