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25W Class A amp with Lateral MOSFETs
25W Class A amp with Lateral MOSFETs
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Old 19th February 2011, 10:18 PM   #11
Melon Head is offline Melon Head  Australia
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It is nice to see more designs with lateral mosfets. Great work

The only thing I would have done different is put the transformer at the front of the case away from signal wires. I am not sugeesting it would make a difference to the end result but that is how I like to do things.

Last edited by Melon Head; 19th February 2011 at 10:21 PM.
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Old 19th February 2011, 10:27 PM   #12
Zen Mod is offline Zen Mod  Serbia
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25W Class A amp with Lateral MOSFETs
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Old 20th February 2011, 03:23 AM   #13
anilva is offline anilva  India
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Juma,

I have a pair of Toshiba laterals, which Ii bought some 15 years back for a elektor circuit and never completed. I also have a 35-0-35v transformer, for which I am looking for a project. Your idea seems a perfect fit. Do you have PCB layout, which you can share?

Thanks.
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Old 20th February 2011, 10:41 AM   #14
juma is offline juma  Germany
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Quote:
Originally Posted by anilva View Post
Juma,

I have a pair of Toshiba laterals, ....
Anliva, which Toshiba laterals do you have?
------------------------------------------

As for PCBs, if you look at the pics you'll see that I make my PCBs by hand and according to my needs. I don't know if it will suit your needs, but here it is (copper/bottom view, 80 x 44 mm).
There are things to consider, to name some of them: most of bypass caps are soldered on the bottom side of the PCB, there are three 3k6 resistors in parallel instead of one 1k2/1W, MOSFET's gates are in the middle, between S and D, there are two GND wires that go to star groung, etc... You'll have to be very carefull if you want to use this PCB, this is not a layout made for beginners
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File Type: gif svaja-pcb.gif (14.8 KB, 2151 views)

Last edited by juma; 20th February 2011 at 11:07 AM.
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Old 20th February 2011, 12:37 PM   #15
anilva is offline anilva  India
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Quote:
Originally Posted by juma View Post
Anliva, which Toshiba laterals do you have?
------------------------------------------

As for PCBs, if you look at the pics you'll see that I make my PCBs by hand and according to my needs. I don't know if it will suit your needs, but here it is (copper/bottom view, 80 x 44 mm).
There are things to consider, to name some of them: most of bypass caps are soldered on the bottom side of the PCB, there are three 3k6 resistors in parallel instead of one 1k2/1W, MOSFET's gates are in the middle, between S and D, there are two GND wires that go to star groung, etc... You'll have to be very carefull if you want to use this PCB, this is not a layout made for beginners
Since you asked me, I went and looked at the laterals with a magnifying glass. I am sorry they are not Toshiba, but Hitachi and the parts are 2SK1058/2SJ162.

I am looking at this as a long shot for now. Will keep you views in mind, if I do the PCB.

Regards
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Old 20th February 2011, 12:48 PM   #16
AndrewT is offline AndrewT  Scotland
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I didn't know that Hitachi made the plastic packaged Laterals, before they sold off/shut down that part of the business.
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Old 21st February 2011, 07:50 AM   #17
Samuel Jayaraj is online now Samuel Jayaraj  India
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Ofcourse, the Hitachi plastic parts were available easily for a long time and they were very good replacements (in most cases) for the static sensitive erstwhile metal parts.
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Old 21st February 2011, 08:07 AM   #18
Mooly is offline Mooly  United Kingdom
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25W Class A amp with Lateral MOSFETs
I've seen plastic FET's with the Hitachi logo... not sure when Renesas took over but this is from 1999 and is Hitachi,
http://www.datasheetcatalog.org/data...r/mXyzruwz.pdf
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Old 23rd February 2011, 07:53 AM   #19
Samuel Jayaraj is online now Samuel Jayaraj  India
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I finally managed to lay my hands on 2SJ74BL to get going with Juma's F5 with 2SK2013/2SJ313 and just then Juma comes up with this other masterpiece. I happen to have all the components for this amp including the Hitachi Laterals but I'll hold it and go ahead with Juma's Toshiba F5.

Juma can I guess the sonic character of this amp compared to the Toshiba F5? This amp is more lush in the mid, subtler/smoother in the highs with the sound-stage a bit more forward. More relaxed overall presentation.

Toshiba F5 is more detailed throughout the spectrum with the Bass a tad bit tighter.

Just my guess but I'd like to hear your reactions. Thanks.
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Old 23rd February 2011, 09:59 AM   #20
juma is offline juma  Germany
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Wow, Sam ! That's some review !

F5 with k2013/j313 is, as I already said, the end of the road when it comes to 20W cl. A amps (that's my opinion).
But this time I wanted something that doesn't have to be perfect in every possible aspect, but it has to be always pretty and attractive without being wrong.
For example: listening to MP3 through F5 is not a pleasent experience, with this amp it's far more enjoyable. Not all our sound sources are perfect, I use the amp to listen to TV and FM tuner too - and I want to enjoy it too.

Last edited by juma; 23rd February 2011 at 10:05 AM.
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