Hitachi MOSFET application note 1989

David Eather · Jul 4, 2009

Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

All help appreciated

David Eather

Lord Garth · Jul 4, 2009

"David Eather" <eather@tpg.com.au> wrote in message
news

CdnWdsGZ2WFtLXnZ2dnUVZ_q6dnZ2d@supernews.com...

Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

All help appreciated

David Eather

....and the part number would be??????

David Eather · Jul 4, 2009

Lord Garth wrote:

"David Eather" <eather@tpg.com.au> wrote in message
newsCdnWdsGZ2WFtLXnZ2dnUVZ_q6dnZ2d@supernews.com...
Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

All help appreciated

David Eather

...and the part number would be??????

Sorry Lord Garth, I couldn't find a part number, hence the providing of
a description

David Eather · Jul 4, 2009

Lord Garth wrote:

"David Eather" <eather@tpg.com.au> wrote in message
newsCdnWdsGZ2WFtLXnZ2dnUVZ_q6dnZ2d@supernews.com...
Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

All help appreciated

David Eather

...and the part number would be??????

The only other detail I have is that the note was published for the

MOSFETs 2SJ49 and 2SK134

Franc Zabkar · Jul 5, 2009

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au>
put finger to keyboard and composed:

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989.

Have you tried the Wayback Machine?

I've found a lot of documents in the archives that have disappeared
from the live Web.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Phil Allison · Jul 5, 2009

"David Eather"

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989.

** It was first published a lot earlier than that.

The only other detail I have is that the note was published for the
MOSFETs 2SJ49 and 2SK134

** The other devices were 2SA970 and 2SC2240.

The original app note schematic was always hard to find on the net - I
found a reproduction of it on a hobby web site by chance a few years ago.

No sign of it now.

...... Phil

David Eather · Jul 5, 2009

Franc Zabkar wrote:

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au
put finger to keyboard and composed:

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989.

Have you tried the Wayback Machine?

I've found a lot of documents in the archives that have disappeared
from the live Web.

- Franc Zabkar

I didn't know about the Wayback Machine - I gave it a good try but no joy.

Franc Zabkar · Jul 6, 2009

On Sun, 05 Jul 2009 15:12:50 +1000, David Eather <eather@tpg.com.au>
put finger to keyboard and composed:

Franc Zabkar wrote:
On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au
put finger to keyboard and composed:

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989.

Have you tried the Wayback Machine?

I've found a lot of documents in the archives that have disappeared
from the live Web.

- Franc Zabkar

I didn't know about the Wayback Machine - I gave it a good try but no joy.

Not many people are aware of it, even though it may potentially be a
bigger resource than the Internet itself.

At the moment there is no text search, but you can find all the PDFs,
for example, that were archived from a particular site over several
years by using the Advanced Search options.

Try this:

http://web.archive.org/web/*re_pd_sr_1nr_30/http://www.hitachi.com*

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Ross Herbert · Jul 6, 2009

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au> wrote:

:Hello All,
:
:I am trying to get a copy of a application note by Hitachi for a MOSFET
:amp published in 1989. You probably have seen amps designed with the
:note's influence - the voltage gain stage is a long tailed pair

differential amp) driven from the input LTP. Just about all the recent
:AUS. magazine designs have used it.
:
:Anyway, can anyone help with a link or a copy of this note? I have
:"googled" but all I can find is some sod who wants 12 Euro for someone
:else's work.
:
:All help appreciated
:

avid Eather

It was bloody hard to come by even back then. I only have a photocopy of it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

Phil Allison · Jul 6, 2009

"Ross Herbert"

It was bloody hard to come by even back then. I only have a photocopy of
it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

** Downloaded and read, amazing I've never seen it published anywhere
before.

Shame there is no date on the doc, but since Hitachi first released their
"power mosfets" better known as " lateral mosfets " back in 1977 - the
actual publication date is close to then.

Must have been the most avidly read app note in history by audio power amp
designers in the late 70s and beyond.

...... Phil

christofire · Jul 6, 2009

"Ross Herbert" <rherber1@bigpond.net.au> wrote in message
news:klp3551kauulddse45234kov2rkjeiq234@4ax.com...

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au
wrote:

:Hello All,
:
:I am trying to get a copy of a application note by Hitachi for a MOSFET
:amp published in 1989. You probably have seen amps designed with the
:note's influence - the voltage gain stage is a long tailed pair
differential amp) driven from the input LTP. Just about all the recent
:AUS. magazine designs have used it.
:
:Anyway, can anyone help with a link or a copy of this note? I have
:"googled" but all I can find is some sod who wants 12 Euro for someone
:else's work.
:
:All help appreciated
:
avid Eather

It was bloody hard to come by even back then. I only have a photocopy of
it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

Thanks,

Chris

David Eather · Jul 7, 2009

Ross Herbert wrote:

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au> wrote:

:Hello All,
:
:I am trying to get a copy of a application note by Hitachi for a MOSFET
:amp published in 1989. You probably have seen amps designed with the
:note's influence - the voltage gain stage is a long tailed pair
differential amp) driven from the input LTP. Just about all the recent
:AUS. magazine designs have used it.
:
:Anyway, can anyone help with a link or a copy of this note? I have
:"googled" but all I can find is some sod who wants 12 Euro for someone
:else's work.
:
:All help appreciated
:
avid Eather

It was bloody hard to come by even back then. I only have a photocopy of it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

Many Thanks. I've got it now (took a while to figure out abse).

Ross Herbert · Jul 7, 2009

On Tue, 7 Jul 2009 00:27:21 +1000, "Phil Allison" <phil_a@tpg.com.au> wrote:

:
:"Ross Herbert"
:>
:> It was bloody hard to come by even back then. I only have a photocopy of
:> it and
:> there are 45 A4 pages in total. I have posted it to abse if that will help
:> (1.9Mb PDF file)
:
:
:** Downloaded and read, amazing I've never seen it published anywhere
:before.
:
:Shame there is no date on the doc, but since Hitachi first released their
:"power mosfets" better known as " lateral mosfets " back in 1977 - the
:actual publication date is close to then.
:
:Must have been the most avidly read app note in history by audio power amp
:designers in the late 70s and beyond.
:
:
:
:..... Phil
:

If you can make out the phone number on the Plessey Components sticker on the
front page you will see that it was a six digit number. Six digit numbers had
disappeared in Australia by the mid to late 1970's.

Clint Sharp · Jul 7, 2009

In message <klp3551kauulddse45234kov2rkjeiq234@4ax.com>, Ross Herbert
<rherber1@bigpond.net.au> writes

It was bloody hard to come by even back then. I only have a photocopy of it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)
Wow, thanks, I've been looking on and off for this for years..

--
Clint Sharp

Eeyore · Jul 7, 2009

David Eather wrote:

Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989.

Which variant ? They published several IIRC. I have paper copies here but
can't scan right now.

Graham

--
due to the hugely increased level of spam please make the obvious
adjustment to my email address

Eeyore · Jul 7, 2009

David Eather wrote:

Hello All,

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

All help appreciated

A bit academic since Hitachi no longer make those lateral mosfets and their
example designs were a bit primitive, though reasonable for the date of
publication. Amp design has moved on several generations since then.

Graham

--
due to the hugely increased level of spam please make the obvious
adjustment to my email address

Franc Zabkar · Jul 7, 2009

On Mon, 06 Jul 2009 12:38:42 GMT, Ross Herbert
<rherber1@bigpond.net.au> put finger to keyboard and composed:

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au> wrote:

:I am trying to get a copy of a application note by Hitachi for a MOSFET
:amp published in 1989.

It was bloody hard to come by even back then. I only have a photocopy of it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

Would you mind if I uploaded it to my web space?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Trevor Wilson · Jul 7, 2009

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:75b755tlnfobpomfkbjce6q9asbaq2kg2l@4ax.com...

On Mon, 06 Jul 2009 12:38:42 GMT, Ross Herbert
rherber1@bigpond.net.au> put finger to keyboard and composed:

On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au
wrote:

:I am trying to get a copy of a application note by Hitachi for a MOSFET
:amp published in 1989.

It was bloody hard to come by even back then. I only have a photocopy of
it and
there are 45 A4 pages in total. I have posted it to abse if that will help
(1.9Mb PDF file)

Would you mind if I uploaded it to my web space?

**I believe you need to direct your question to Hitachi. They own the
copyright. And, thanks to the bizarre laws surrounding copyright, they have
75 years to determine who can publish it, if I'm not mistaken.

--
Trevor Wilson
www.rageaudio.com.au

Phil Allison · Jul 8, 2009

"Eeyore"
David Eather wrote:

I am trying to get a copy of a application note by Hitachi for a MOSFET
amp published in 1989. You probably have seen amps designed with the
note's influence - the voltage gain stage is a long tailed pair
(differential amp) driven from the input LTP. Just about all the recent
AUS. magazine designs have used it.

Anyway, can anyone help with a link or a copy of this note? I have
"googled" but all I can find is some sod who wants 12 Euro for someone
else's work.

A bit academic since Hitachi no longer make those lateral mosfets

** BULLSHIT !!!

Hitachi lateral mosfets ( in TO220 and TO3P ) are still made and sold under
the " Renesas " brand.

http://www.renesas.com/fmwk.jsp?cnt=power_mos_gen_amp_root.jsp&fp=/products/discrete/power_mos/power_mosfets_for_amplifier/power_mos_gen_amp/

TO3 metal pack lateral mosfet devices are readily available from Exicon and
Semelab - these are good substitutes in any of the Hitachi circuits.

In Australia, Altronics sells the former and Farnell sell the latter.

See:

http://www.altronics.com.au/index.asp?area=prod&grp=104

and their example designs were a bit primitive,

** Pompous crap.

Amp design has moved on several generations since then.

** Moved on maybe, but all down hill.

...... Phil

Ross Herbert · Jul 8, 2009

On Wed, 08 Jul 2009 06:16:05 +1000, Franc Zabkar <fzabkar@iinternode.on.net>
wrote:

:On Mon, 06 Jul 2009 12:38:42 GMT, Ross Herbert
:<rherber1@bigpond.net.au> put finger to keyboard and composed:
:
:>On Sun, 05 Jul 2009 03:01:45 +1000, David Eather <eather@tpg.com.au> wrote:
:
:>:I am trying to get a copy of a application note by Hitachi for a MOSFET
:>:amp published in 1989.
:>
:>It was bloody hard to come by even back then. I only have a photocopy of it
and
:>there are 45 A4 pages in total. I have posted it to abse if that will help
:>(1.9Mb PDF file)
:
:Would you mind if I uploaded it to my web space?
:
:- Franc Zabkar

It is OK with me Franc.

While Trevor's warning re copyright might technically apply, I can't see Hitachi
contesting your publication since the devices are no longer manufactured by
them.

Hitachi MOSFET application note 1989

David Eather

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