Re: Urgent - Time to kill, want to build IR Extender

["Graham Howe" <graham@xxxxxxx>]

OK found a pin diagram for the 555, boy was I wrong ! Could still do with
some help on the other questions though.

Graham

----- Original Message -----
From: "Graham Howe" <graham@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, October 30, 2000 6:33 PM
Subject: Re: [ukha_d] Urgent - Time to kill, want to build IR Extender


> OK I managed to get the components from Maplin to build Nigel's
transmitter,
> I think I have everything connect up OK on the plug board, and I have
added
> a wire from pin 8 to the +12V rail. But before I connect any power I
have
a
> few questions (all of you electronics experts can feel free to laugh
at my
> stupidity!).
>
> First off, the 555 timer has an indentation on the top, does this
indicate
> pin 8, also are pin numbers ordered as per Nigel's diagram, if not
what is
> the sequence.
>
> Second, the LED's, I know that the shortest leg is the cathode, does
that
> mean the other leg is the one to connect to the +12V.
>
> Third, the transistors, how do I know which leg is which. I have
assumed
the
> diagram shows the plan view of the transistor, but there is a little
tag
by
> one leg which I have assumed is number three on the diagram, is this
correct
> ?
>
> Finally, is there any way I can test the transmitter without a
receiver
and
> when I get a receiver (hopefully from Keith), where does that connect
to
the
> transmitter ?
>
> I am sorry for these really basic questions, but this is my first ever
> circuit and I would rather it didn't go bang as soon as I connect the
power.
>
> Regards
>
> Graham
>
>
>
>
>
>