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Old 3rd February 2015, 08:04 PM   #1
pepbox is offline pepbox  United Kingdom
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Smile Amplifier circuit from Elektor

Hello to you all, does anyone know where I can get a copy of the following article in Elektor, "High-Power AF amplifier" it used Hitachi MosFets and was in a 1986 edition, any help would be most appreciated. Pepe
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Old 3rd February 2015, 10:02 PM   #2
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Here is a Hitachi lateral mosfet amplifier circuit.
I took this and added numerous improvements for myself.
I added decoupling of front end from output stage.
I changed front end transistors to mpsa42/92.

If you cant find mosfets for it I used ALF16N16W and ALF16P16W lateral mosfets.
Click the image to open in full size.
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Old 3rd February 2015, 11:12 PM   #3
pepbox is offline pepbox  United Kingdom
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Hello Nigel, thank you for the information, unfortunately this is not the article I was looking for the one I wanted either used 8 Toshiba Mosfets and the other one used Siemins BUZ musfets, but I will try this one anyway, thanks once again Pepe
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Old 4th February 2015, 04:39 PM   #4
mabery is offline mabery  Netherlands
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Quote:
Originally Posted by pepbox View Post
Hello Nigel, thank you for the information, unfortunately this is not the article I was looking for the one I wanted either used 8 Toshiba Mosfets and the other one used Siemins BUZ musfets, but I will try this one anyway, thanks once again Pepe
I recall the Crescendo and Mini Crescendo amplifiers using 2SK135/2SJ50 pairs
I have build the Mini version and etched my own pcb during those years for my guitar combo amp. Worked very well...

I still have the PCB and the ILP HY-83 preamp module. the amp cab was destroyed
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Old 4th February 2015, 06:27 PM   #5
mjf is offline mjf  Austria
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......yes,the crescendo has four hitachi fet per channel.......

in the elektor "audio-schaltungsbuch" there is an amp called "gigant" with 8 hitachi fet per ch......

and a "buzamp" with 4 buz23 per ch.
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Old 26th March 2015, 07:32 PM   #6
el156 is offline el156  Portugal
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Here is the BUZ23 amplifier...i made one years ago,very good amp, then sold it and the owner is still very pleased with it.
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File Type: jpg IMG_6997.jpg (973.9 KB, 338 views)
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Old 5th August 2015, 02:04 PM   #7
jlithen is offline jlithen  Finland
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I just bought a buzamp from Germany.
It looks like **** inside, even if parts are of good quality. Someone really likes paint

I fixed some bad contacts and would like to adjust BIAS, trimmers were firmly glued and difficult to replace, but my questios is, what is proper BIAS?
One channel was about 80mA and the other about 8mA
I would have thought 100-200mA is good?

Supply is 2x55VDC and there is a big enough heat sink.
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Old 5th August 2015, 03:08 PM   #8
tvi is offline tvi  Australia
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http://www.designfactory.co.za/audio/Elektor1986.pdf third entry from gooogle search
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Old 6th August 2015, 05:53 AM   #9
jlithen is offline jlithen  Finland
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Still wondering what the BIAS is meant to be, but I got quite far by measuring and tuning

Anyway power fets were far from matched, but I adjusted so that lowest voltage over 1/4ohm resistor bunch was 14mV = 56mA
I guess the highest was up to about 200mA then.

Results are pretty impressive for such a garage build. 1W 1kHz 7ohm

Must say I am also impressed by the simplicity of the signal route.
Maybe this is a good design after all!
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Old 6th August 2015, 06:40 AM   #10
poynton is offline poynton  United Kingdom
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Try this :.....


Ray's Audio Page

Down the page is the Crescendo

Andy
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