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[DPRG] Re: PWM Circuit Based on the 555 Timer

Subject: [DPRG] Re: PWM Circuit Based on the 555 Timer
From: Triffid Hunter triffid_hunter at funkmunch.net
Date: Sat May 26 22:58:33 CDT 2007


On Sat, 26 May 2007, Pavlik Pravtchev wrote:

>
>
> I have created a circuit based on article A Simple PWM Circuit Based on the
> 555 Timer -posted on:  http://www.dprg.org/tutorials/2005-11a/         and
> it works but my Load is connected to the ground and if I connect the Source
> of the FET to the load and Drain to the +13v , FET heats up very much. What
> solution you can give me to drive the FET properly.

connect your load as shown in the circuit, or use a p-channel fet.

the method you're using will keep the fet in it's linear zone where it 
will dissipate an enormous amount of heat.

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