hi everybody...
i'm planing to change my 2 mosfet modules with another 2
what do you think about this 2 amps?
what is the best?
is a good idea to replace my FT15K with the P101??
This is the link to the P101:
http://sound.westhost.com/project101.htm
And this is the pdf file of the FT15K
waiting for replyes
i'm planing to change my 2 mosfet modules with another 2
what do you think about this 2 amps?
what is the best?
is a good idea to replace my FT15K with the P101??
This is the link to the P101:
http://sound.westhost.com/project101.htm
And this is the pdf file of the FT15K
waiting for replyes
I would also go for ESP Project 101.
High Power, High Fidelity MOSFET Power Amplifier
Rod Elliott (ESP)
Updated 01 Feb 2004
He uses good audio transistors but still such that are easy to find almost anywhere.
This is typical for Rod Elliott, like for Nelson Pass.
The input uses a pair of MPSA42.
I know these are favourite transistors of other good amplifier designers at this forum.
The current mirror uses lownoise BC559. You could use BC560 just as well.
The voltage amplification stage uses only one MJE350 and bootstrapping.
MJE350 is know to work well in VAS stages. And can take the higher voltage of the hi-power version.
The output is based on the Renesas.com
great Lateral MOSFET complementary 2SK1058 / 2SJ162 (former Toshiba transistors).
Power MOSFET for General Amplifiers
There are many hifi amplifiers, even commercial top class,
that uses these nice Audio output devices.
MOSFET does not come much better than this.
At least not for normal level of Audio Power output.
And if you want good quality sound reproduction in your loudspeakers.
He has got 2 versions.
One or two output pairs.
For normal or high listening levels. Normal or high power.
I can only say same as previous poster:
go for ESP Project101
http://sound.westhost.com/project101.htm
Note:
for this project Rod Elliott wants you to order His boards
and then you get all details and schematics for build.
Current Price, for PCB boards ready to use and instructions:
P101 200W MOSFET Power Amplifier US$17.00 Ea
lineup
Lineup Audio Amplifiers
High Power, High Fidelity MOSFET Power Amplifier
Rod Elliott (ESP)
Updated 01 Feb 2004
An externally hosted image should be here but it was not working when we last tested it.
He uses good audio transistors but still such that are easy to find almost anywhere.
This is typical for Rod Elliott, like for Nelson Pass.
The input uses a pair of MPSA42.
I know these are favourite transistors of other good amplifier designers at this forum.
The current mirror uses lownoise BC559. You could use BC560 just as well.
The voltage amplification stage uses only one MJE350 and bootstrapping.
MJE350 is know to work well in VAS stages. And can take the higher voltage of the hi-power version.
The output is based on the Renesas.com
great Lateral MOSFET complementary 2SK1058 / 2SJ162 (former Toshiba transistors).
Power MOSFET for General Amplifiers
There are many hifi amplifiers, even commercial top class,
that uses these nice Audio output devices.
MOSFET does not come much better than this.
At least not for normal level of Audio Power output.
And if you want good quality sound reproduction in your loudspeakers.
He has got 2 versions.
One or two output pairs.
For normal or high listening levels. Normal or high power.
I can only say same as previous poster:
go for ESP Project101
http://sound.westhost.com/project101.htm
Note:
for this project Rod Elliott wants you to order His boards
and then you get all details and schematics for build.
An externally hosted image should be here but it was not working when we last tested it.
Current Price, for PCB boards ready to use and instructions:
P101 200W MOSFET Power Amplifier US$17.00 Ea
lineup
Lineup Audio Amplifiers
XEAGLEKEEPER said:
MEGA-amp said:
djQUAN said:I have built a pair and it does very well.
very quiet and very good sound quality.the power rating that rod gives them seem to be small but they sound more powerful than what he says.
when 1 man say something it may be true - but we can not be sure
when 3 men say something = the same - it is probably close to true
... this is called verification
Sometimes we can want somebody to verify.
Because we want to be able to believe in it, a bit more.
I for myself, have not built or listened to P101 2Sk1058 / 2SJ162 MOSFET Amplifier.
I can only tell from the schematic, that this is a good amplifier.
And I know Mister Rod Elliott from Australia would not publish a project
if he had not tested the performance properly
and was very satisfied with the result.
Regards to you all
lineup
Flavio88 said:
See my attached schematic of FT15.
Yes, it uses same output 2SK1058 / 2SJ162.
The difference is have current mirror in Second stage.
And uses not a more robust TO126 like MJE350 for voltage amplification / driver of output stage.
But FT15 uses TO92:
MPSA42 and MPSA92 .. in both input and VAS stage and for drivers!
This means probably LESS Current in second stage for drive MOSFET.
Also another difference is only Resistors R13+R14 to control bias in output.
Of course we could easy change a bit, to use diodes or Transistor for this.
Like done in ESP P101.
I think FT15 is also a very good amplifier.
But if I had to chose, I would take Elliott Project101.
Because I like to have MORE Current (=TO126) in Second driver stage.
This is from a quick look at those both amplifiers.
I say like this.
It is more up to you.
I think you would be happy with both amplifiers.Attachments
hi Flavio88,
If you would like more information, the FT15 is very similar to Randy Slone's "Design 1. Basic MOSFET Design" from his High-power Audio Amplifier Construction Manual. Randy describes it as "One of the simplest power amplifier designs possible that will provide reasonably good performance".
You would probably get more help and feedback from this group if you built the P101 though. Also, you probably know Rod is only a email away and he has his own forums for his ESP designs.
regards
If you would like more information, the FT15 is very similar to Randy Slone's "Design 1. Basic MOSFET Design" from his High-power Audio Amplifier Construction Manual. Randy describes it as "One of the simplest power amplifier designs possible that will provide reasonably good performance".
You would probably get more help and feedback from this group if you built the P101 though. Also, you probably know Rod is only a email away and he has his own forums for his ESP designs.
regards
Greg Erskine said:
Yes, it is maybe little known, but as Greg tells,
Rod Elliott has got his own Support DIY forum.
He may not always answer himself,
but there are a couple of other good guys over there
that would know most of howto, regarding ESP projects circuits.
FORUM - ESP Projects and Articles
Dedicated to ESP Projects and Discussions
===========================================
It is also true what Greg Erskine says,
that FT15 is using the most basic circuit
that still can drive Lateral MOSFET in a good way.
With good results.
It was very often used way back when these Lateral MOSFETs were news of the day.
See my attachment This circuit is from a book published 1991.
26 years ago.
It is VERY much alike FT15.
Have a look, and you will see!
This was a way to design that many used
because:
- it was simple
- very few transistors
- gave very good results
- compared to other amplifiers around at this time
Regards
lineup
Attachments
Here I found a very good
article with many photos and details
of one FT15K MOSFET Module Project.
It is in the Italian language, but some understands this
and I can understand much by looking at pictures and schematics and numbers.
( Italian people uses same numbers, 1,2,3 as everybody in Europe! )
Enjoy!
Amplificatore finale a stato solido
da (più di) 100 Watt alto una sola unità
percorso di realizzazione
one solide state power amplifier
with 100 watt output in one single unit
description of realization
This image, from same webpage, shows
One such Power MOSFET Amp Module Unit, FT15K
article with many photos and details
of one FT15K MOSFET Module Project.
It is in the Italian language, but some understands this
and I can understand much by looking at pictures and schematics and numbers.
( Italian people uses same numbers, 1,2,3 as everybody in Europe! )
Enjoy!
Amplificatore finale a stato solido
da (più di) 100 Watt alto una sola unità
percorso di realizzazione
one solide state power amplifier
with 100 watt output in one single unit
description of realization
This image, from same webpage, shows
One such Power MOSFET Amp Module Unit, FT15K
An externally hosted image should be here but it was not working when we last tested it.
FT15 FT15K
This shows
The completed FT15 STEREO Amplifier.
With a very large CAPACITOR BANK in the power supply
Power Supply is +/-50 Volt DC.
The FT15 Kit can be found at this supplier
http://www.futuraelettronica.it/
.... and maybe some other suppliers in other country.
This shows
The completed FT15 STEREO Amplifier.
With a very large CAPACITOR BANK in the power supply
Power Supply is +/-50 Volt DC.
An externally hosted image should be here but it was not working when we last tested it.
The FT15 Kit can be found at this supplier
http://www.futuraelettronica.it/
.... and maybe some other suppliers in other country.
lineup said:It was very often used way back when these Lateral MOSFETs were news of the day.
This circuit is from a book published 1991.
26 years ago.
It is VERY much alike FT15.
Have a look, and you will see!
Hey lineup, that's must have been where Randy got the design from, because it is almost identical except for the newer components Randy used.
Greg Erskine said:
Hey lineup, that's must have been where Randy got the design from,
because it is almost identical except for the newer components Randy used.
May be.
We are many that have read the same books
in the beginning of the transistor electronics era.
And so we have these old circuits 'in our heads'.
... why do you think I so quickly could associate from FT15 to that old circuit ...
It is not because I searched some register or googled at internet.
It is because I carry this stuff around firmly stuck inside my head.
It is fun and good learning, to see some almost forgotten ways
they used transistors in the old days.
Because of IC chips was something new, exclusive and maybe expensive,
( if they even were invented )
they used Tubes and Transistors in very smart and clever ways,
to do what everyone easily does using low cost op-amps to do today.
=========================================================
My Schematic is from one such low cost, small paperback book.
So called "Babani Electronics Books"
BERNARD BABANI (publishing) LTD, London, England
It is a series of a couple of hundred(!) books about electronics.
I have and bought the following ones 1996-1997:
------------
by F.G.Rayer:
- Audio Projects -81
by R.A.Penfold - 5 books!
- Preamplifier and Filter Circuits -91
- Audio Amplifier Construction -83
- High Power Audio Amplifier Construction -91
- Power Supply Projects -80
- More Advanced Power Supply Projects -88
==========================================================
My attached schematic in post above is from:
High Power Audio Amplifier Construction -91.
But actually a similar 100 Watt MOSFET Project,
using 2 paralleled pairs of 2SK134 / 2SJ49
is found in already in Audio Amplifier Construction -83
Published first by BERNARD BABANI LTD, London, in 1983.
==========================================================
Both these books by R.A. Penfold
can be found at Amazon and other sites, for rather low price.
Some links:
http://www.amazon.com/High-Power-Audio-Amplifier-Construction/dp/0859342220
http://www.amazon.com/Audio-Amplifier-Projects-R-Penfold/dp/187077552X
Babani Books - is still in business:
http://www.babanibooks.com/
www.audioclassics.com in New York, USA
has currently the following Babani books for ordering.
The prices would be in US Dollars $ and they accept Paying cards etc.
Babani Publishing BP111 Elements of Audio Book 6 11.00 EA
Babani Publishing BP122 Audio Amplifier Construction 7.00 EA
Babani Publishing BP245 Digital Audio Projects 7.00 EA
Babani Publishing BP256 Intro to Speakers & Enclosures 7.00 EA
Babani Publishing BP277 Hi Power Amp Construction 8.00 EA
Babani Publishing BP297 Loudspeakers for Musicians 8.00 EA
Babani Publishing BP309 Preamp and Filter Circuits 8.00 EA
Babani Publishing PCP116 Introducing Digital Audio 13.00 EA
http://www.audioclassics.com/cat.php3?cat=Books
Regards
lineup
Flavio88 said:
That will be good Flavio!Be sure to start a new topic about your building FT15 MOSFET modules.
And later maybe you show us some nice results - some images here in forum.
Good Luck.
Question:
Is this your first power amplifier project, Flavio?
I think I have seen you at diyAudio.com forum for some time now.
lineup
no, no, i've build the ft15 2 or 3 years ago... they are playng a good Ray Brown cd...
No, it isn't my first amp, i've build many amps...
I'm in trouble because i don't know if is better buy 2 p101 or mantain 2 ft15...alltrought i want to buy another 2 pairs of 2sk/2sj
to use in the ft15 or even in 2 new p101...
No, it isn't my first amp, i've build many amps...
I'm in trouble because i don't know if is better buy 2 p101 or mantain 2 ft15...alltrought i want to buy another 2 pairs of 2sk/2sj
to use in the ft15 or even in 2 new p101...
Flavio88 said:
That is a NICE TROUBLE - to have 2 good things to take.
When do not know any one good thing - is bad
... maybe you build one P101 + one FT15
... then you keep the best one, which you like best
and give the other one to your sister / brother / mother / father / good friend
if they listen to music
Do you think it is possible to use 2 pairs in FT15 ?
I think so.
But, I think, we need to make change in driver stage T3,T4,T5
because driving 2 pairs 2SK1058 / 2SJ162 is more heavy load for this stage.
Need a bit more current for t3,t4,t5 and change maybe to TO126 transistors.
Also need one new PCB - for 4 Output MOSFET.
( see FT15 PCB in my attachment )
Can you design and make your own PCB?
But this is no problem ... many members here are good with this.
They can help, if we need.
Attachments
Flavio88 said:P.S. i don't know if my english is understandable... please tell me when you dont understand me...
Your english is great, it's my lack of comprehension that's the problem.
I didn't read your original post carefully. 
Lineup,
Thanks for those book references. I'll follow up some of these as I am very interest in PSUs at the moment.
regards
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.