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Lateral MOSFET amplifier project

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28th January 2015, 12:07 AM

#1

nigelwright7557

diyAudio Member

Join Date: Apr 2008

Location: Carlisle, England

Lateral MOSFET amplifier project

I have just finished a lateral MOSFET
amplifier project.
It uses ALF16N16w and ALF16P16w lateral
mosfets.

Its a steal of the Maplin 150WRMS mosfet amplifier circuit
which was taken from a Hitachi datasheet. I have added a DC offset control
pot and changed the output mosfets to something more available.
I also
added better decoupling of the front end power supply.

__________________
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software. http://murtonpikesystems.azurewebsites.net/

Last edited by nigelwright7557; 28th January 2015 at 01:18 AM.

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28th January 2015, 01:27 AM

#2

Miles Prower

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Join Date: May 2005

Location: USA

Blog Entries: 7

Looks very much like the design I came up
with: Si-Lver Fox.

I never claimed originality since I
figured someone, somewhere had dunnit before. I've seen that Hitachi
applications report before, several years after completing the prototype
for the Si-Lver Fox. That's always the way it goes: come up with something
"new", find out it's been done before. Inevitable given the sheer number
of man-hours of research over the past half-century or so.

The A
Number One difference is the bipolar finals. I prefer BJTs here, and
especially full Sziklai Pairs. Be interesting to see how it performs with
laterals.

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28th January 2015, 01:31 AM

#3

nigelwright7557

diyAudio Member

Join Date: Apr 2008

Location: Carlisle, England

The Maplin version had 2sk133 and 2sj48
lateral mosfets on the output.
Maplin sold quite a lot.
I recently
was lucky enough to spot an unmade kit on ebay.
I bought it and built
it up, it worked first time.

The last time I built one up was
around 1980 for a disco but it wasn't loud enough.
I bought the Maplin
225WRMS bipolar kit instead and that was very loud.

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software. http://murtonpikesystems.azurewebsites.net/

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28th January 2015, 04:00 AM

#4

gannaji

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Join Date: Jan 2011

Location: Hyderabad

Some people like inverted images !

Attached Thumbnails

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28th January 2015, 05:28 AM

#5

Walkalone

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Join Date: May 2011

Location: Ho Chi Minh city

The Ciss of MOSFET don't have balance, so,
you need change the value of gate resistors.
Based by formula: Fc =
1/(2.pi.Ciss.Rgate).

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28th January 2015, 01:49 PM

#6

AndrewT

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Join Date: Jul 2004

Location: Scottish Borders

Quote:

Originally Posted by gannaji

Some people like inverted images
!

Could you take the time to talk
me/us through the keystokes to invert the colours of the sch?

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28th January 2015, 01:49 PM

#7

AndrewT

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Join Date: Jul 2004

Location: Scottish Borders

Quote:

Originally Posted by Walkalone

The Ciss of MOSFET don't have
balance, so, you need change the value of gate resistors.
Based
by formula: Fc =
1/(2.pi.Ciss.Rgate).

or add some
correcting capacitance.
or do a combination of both.

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28th January 2015, 02:08 PM

#8

richie00boy

Did it Himself

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Join Date: Nov 2003

Location: Gloucestershire, England, UK

Good effort Nigel. You have added source
resistors and Vgs zeners which should make it more hardy and reliable.
Nice big PCB too, ideal for beginners. Or are you selling them as ready
made modules only?

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audio people - designs, PCBs, modules and more.

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28th January 2015, 02:12 PM

#9

thimios

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Join Date: Aug 2009

Location: Agrinion

Quote:

Originally Posted by AndrewT

Could you take the time to talk
me/us through the keystokes to invert the colours of the
sch?

Look here how doing this using
Windows Paint.

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28th January 2015, 02:30 PM

#10

AndrewT

diyAudio Member

Join Date: Jul 2004

Location: Scottish Borders

Is Windows Paint the only way to do
this?
I generally use IrfanView to open pic documents and I did
eventually manage to change colours on a two layer PCB to hide the "other"
layer, but it took so many reloads and retries that I forgot how to repeat
a week later.

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