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Old 28th September 2006, 03:47 PM   #11
richie00boy is offline richie00boy  United Kingdom
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Please comment on this amplifier
Renesas are Hitachi + Samsung (I think?)
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Old 28th September 2006, 03:59 PM   #12
lineup is offline lineup  Sweden
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Quote:
Originally posted by AndrewT
Renesas, Types include
2sj160/1/2 & 2sk1056/7/8
2sj81/2/3 & 2sk225/6/7
2sj48/9/50 & 2sk133/4/5
Thanks for info, Andrew! http://www.renesas.com/
Only Last week I had some idea for a Purist Lateral Power amplifier.
From some aspects, these great, but expensive! MOSFET
can make a good audio amp design a little bit more easy.

Good stuff at this page:
http://www.renesas.com/fmwk.jsp?cnt=...r_mos_gen_amp/

Code:
2SJ160	TO-3P	 	-7	PRSS0004ZE-A(TO-3P)
2SJ161	TO-3P	 	-7	PRSS0004ZE-A(TO-3P)
2SJ162	TO-3P	 	-7	PRSS0004ZE-A(TO-3P)
2SJ351	TO-3P	 	-8	PRSS0004ZE-A(TO-3P)
2SJ352	TO-3P	 	-8	PRSS0004ZE-A(TO-3P)
2SJ76	TO-220AB	 	-0.5	PRSS0004AC-A(TO-220AB)
2SJ77	TO-220AB	 	-0.5	PRSS0004AC-A(TO-220AB)
2SJ78	TO-220AB	 	-0.5	PRSS0004AC-A(TO-220AB)
2SJ79	TO-220AB	 	-0.5	PRSS0004AC-A(TO-220AB)
2SK1056	TO-3P	 	7	PRSS0004ZE-A(TO-3P)
2SK1057	TO-3P	 	7	PRSS0004ZE-A(TO-3P)
2SK1058	TO-3P	 	7	PRSS0004ZE-A(TO-3P)
2SK213	TO-220AB	 	0.5	PRSS0004AC-A(TO-220AB)
2SK214	TO-220AB	 	0.5	PRSS0004AC-A(TO-220AB)
2SK215	TO-220AB	 	0.5	PRSS0004AC-A(TO-220AB)
2SK216	TO-220AB	 	0.5	PRSS0004AC-A(TO-220AB)
2SK2220	TO-3P	 	8	PRSS0004ZE-A(TO-3P)
2SK2221	TO-3P	 	8	PRSS0004ZE-A(TO-3P)

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Old 28th September 2006, 04:37 PM   #13
sreten is offline sreten  United Kingdom
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Hi,

The circuit is near identical to the original Hitachi aplication note.
And the 100W kit they used to sell in Maplins here in the UK.

I've had 3 in various bits of equipment, they all expired, presumably
due to unchecked parasitic output oscillations, its not a reliable circuit.

Also its very poor at utilising the full rail voltages driving low impedance
loads, the MOSFETs take up over 10V of swing each, not what you want.

All in all, avoid like the plague, and don't tell me it seems fine in a Simulator.

/sreten.
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Old 12th January 2007, 03:18 PM   #14
Marito is offline Marito  Argentina
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Hi everybody, very well discussions!!!
Anyway i want to know if somebody knows the way to replace P2 in the schematic http://users.swing.be/edwinpaij/ima...plisimpleV2.gif for a Vbe multiplier and his components,PLEASE!!!!
Cheers
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Old 12th January 2007, 03:38 PM   #15
AndrewT is offline AndrewT  Scotland
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Hi,
leave P2 in place and add the Vbe multiplier around it.
Remember to also add the cap (100nF to 1uF) across the
multiplier.
Add zener (5v6 to 7v5) protection to the gate/source of the output FETs. Some say this and the existing rail fuses are all one needs to protect the output stage.

ps. what am I doing wrong? I still can't get it to link.
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Old 12th January 2007, 06:32 PM   #16
lineup is offline lineup  Sweden
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Quote:
Originally posted by Marito
Hi everybody, very well discussions!!!
Anyway i want to know if somebody knows the way to replace P2 in the schematic http://users.swing.be/edwinpaij/ampli_mosfet_simple.htm for a Vbe multiplier and his components,PLEASE!!!!
Cheers
Quote:
Originally posted by AndrewT
Hi,
leave P2 in place and add the Vbe multiplier around it.
Remember to also add the cap (100nF to 1uF) across the
multiplier.
Add zener (5v6 to 7v5) protection to the gate/source of the output FETs. Some say this and the existing rail fuses are all one needs to protect the output stage.

ps. what am I doing wrong? I still can't get it to link.

You are not doing anything wrong, AndrewT not this time ...

A little research and here is the full article of this project:
the images are in top class quality, like:
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


You have it in French ( and in English ... if you like this any better )
Ampli MOSFET Simple


lineup
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Old 12th January 2007, 10:33 PM   #17
Marito is offline Marito  Argentina
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Thank you AndrewT and lineup, but...sorry...I am a beguinner in mosfet amps, please explain to me in that consists the Vbe around the P2 (what kind of transistor, and the values of resistances)
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Old 13th January 2007, 07:46 AM   #18
AndrewT is offline AndrewT  Scotland
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Marito wants spoon fed.
Do we accomodate?

I am not, is anyone one else willing?
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Old 13th January 2007, 08:00 AM   #19
djk is offline djk
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See page 4, you will need about 8V bias.

http://www.passdiy.com/pdf/a40.pdf
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Old 15th January 2007, 11:40 PM   #20
Marito is offline Marito  Argentina
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Please guys!!, I continue waiting for my spoon of fed, donīt let me alone, please, please.....PLEASE!
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