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From: "Guillaume sjm"
References: <email@example.com> <3D7A6441.firstname.lastname@example.org>
Subject: Re: HI FI amplifier question: help needed
Date: Sun, 8 Sep 2002 08:59:48 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Organization: Guest of ProXad - France
NNTP-Posting-Date: 08 Sep 2002 08:59:49 MEST
Thank you indeed. I get it fine now.
I'll keep you posted.
Have a good WE
"Gareth" a écrit dans le message de
> Guillaume sjm wrote:
> > Hello
> > Second question: a Mosfet can accept how much V on its Gate ? is it
> > the power supply or much less ? i noticed on some schematics that there
> > zener diode of about 15 Volts on the gate to protect it. In this case,
> > the Voutput limited to +-15Volts ?
> As Kevin says, most MOSFETs have a maximum gate to source voltage (Vgs)
> of 20V. Look at the data sheet for the MOSFET you are using.
> Vgs is the potential difference between the gate and the source, not the
> gate voltage with respect to ground (unless the source shorted to
> ground). For example, if the source of the MOSFET was at 1000V with
> respect to ground most MOSFETs would survive a gate voltage of 1019V
> with respect to ground since the difference is only 19V. DO NOT TRY THIS.
> If your amplifier is working correctly the source voltage of the MOSFET
> will go up when the gate voltage goes up, Vgs should therefore be much
> less than 20V. Your output voltage will therefore not be limited to the
> maximum gate to source voltage.
> To reply to me directly:
> Replace the text after the@symbol with: totalise DOT co DOT uk
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