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

[Peter Bieringer <pb@bieringer.de>]

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- --On Sunday, May 12, 2002 07:59:05 AM +0200 Dariush Forouher
<dariush@forouher.de> wrote:

> Am Son, 2002-05-12 um 00.50 schrieb Peter Bieringer:
>> - --On Saturday, May 11, 2002 09:12:24 PM +0200 Dariush Forouher
>> <dariush@forouher.de> wrote:
>> 
>> > Hello everybody,
>> > 
>> > I'm trying to build an IR-Reciever for Rev 1.3 board described on
>> > www.linuxdvb.tv. I'm not very familiar with electronic and I
>> > don't know this transistor symbol. Can somebody please explain,
>> > what "Kollektor", "Emmitter" and "Basis" on this drawing are.
>> > (Sorry for my bad englisch ;)
>> 
>> Don't see the drawing but normally 
>> 
>> Bipolar transistor:
>> 
>> 
>>         C
>>        /
>>      | /
>> B ---|
>>      | \
>>        \
>>         E
>> 
>> On Emitter, an arrow is in the line to the Basis.
>> If arrow tip shows to the Basis: PNP transistor, if to Emitter: NPN
>> transistor
> 
> Yes, I have learned this symbol in school. But I mean this:
> 
> -----| |
>      | |
>      | |
>| --->| |
>| ----| |-----
>| 
>| 
> 
> The datasheed says 'N channel', does that mean npn?

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.

        Peter
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