[linux-dvb] Re: J2 IR-Reciever - another question

[Dariush Forouher <dariush@forouher.de>]

Am Son, 2002-05-12 um 09.34 schrieb Peter Bieringer:
> No, this symbol is a Field Effect Transistor (FET) (very different
> kind to bipolar). It has Source, Drain and Gate (and sometimes an
> extra connector for Substrat [or also called Base]).
> 
> Drain ----| |
>           | |
>           | |
>      |--->| |
>      |----| |----- Gate
>      |
>      |
>   Source
> 
> 
> Drain ----| |
>           | |
> Base ---->| |
>           | |
> Source ---| |----- Gate
> 
> 
> N-channel: tip of arrow points to Gate, P-channel vice versa.
> 
> FET mostly cannot be replaced by a bipolar one because of circuit
> design.
Can you please show me a simple circuit, that tests this transistor,
e.g. with a led? I've tried it already yesterday but connected the
channels wrong, so I'm not sure if I broke it. It's a BS170.

ciao
Dariush

PS: What exactly is the differency between a FET a bipolar transistor?




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