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

[Joerg Riechardt <J.Riechardt@gmx.de>]

Dariush Forouher wrote:

> Am Mon, 2002-05-13 um 19.17 schrieb Joerg Riechardt:
> > Dariush Forouher wrote:
> >
> > > > How many volt do you have at drain with/without remote signal?
> > >
> > > Without signal: 2.10 V
> > > With signal   :~2,25 V
> > > (after the 220 Ohm resistor)
> >
> > that means, there is something wrong with your circuit
> > do you have same values without the additional LED?
> >
> > > (I've no oszilloscope to messure, only a voltmetre)
> >
> > that's enough
>
> I've just read that the transistor I used (BSS38) isn't compatible with
> the BSS98. (I bought different types because I wasn't sure about
> anything). I replaced it with the BS170 that should work, I was told.
> But no voltage changes can be messured/seen with a LED with that
> transistor.

use volt metre instead of LED!

> I've already tried different TSOP1738 and Condensators. Can
> you please draw a simple circuit with that I can test the transistor?

Sorry, can't help you with that.

>
> (I've looked at the one from
> http://www.fairchildsemi.com/ds/BS/BS170.pdf, but I'm too stupid to see
> what resistors I have to put before drain, gate and/or source).
>
> I've also tried to cut down the cable (it's now about 20cm long).

I have ~ 2m, length shouldn't be a problem.

>
>
> ciao
> Dariush






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