Re: Re: Hmevision ir transmitter

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Andy and Ian
                        
Over the weekend i will make a prototpye of the
circuit i have and test  it. As  Ian B suggested, in my circuit
only one tx
is active at any time. If you require that several Zones are active at
exactly the same time then go down the path Ian suggests. Also the
circuit
you are working on make sure the LEDS are the correct way round.

Frank Mc
----- Original Message -----
From: "Ian Davidson" <ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 31, 2002 3:54 PM
Subject: Re: [ukha_d] Re: Hmevision ir transmitter


> Andy
>
> Ok lets get something working!
>
> Firstly lets check the led's will light. Short out the collector
and
emitter
> of the 2N2222. This is quite safe, and is the equivelent of just
wiring
the
> led's and resistor to a battery. The LED's should light. If they do
not
I'm
> afraid you have a wiring error somewhere.
>
> Now if that is ok, we now need to check that TR2 switches. So remove
the
> short from collector / emitter. Also remove the link between from
the
> emitter of tr1 to the base of tr2. Now connect say a 1K Ohm resistor
from
> the base of tr2 to the +5v supply. Again the LED's should light, if
not
this
> would sugest a problem with tr2.
>
> Now if you get this far remove the 1K and replace the link between
emitter
> and base. Now try putting the 1K Ohm between the base of TR1 and the
+5V
> supply again the LED's should light.
>
> Ok let me know how far you get. If I get chance I'll try to read the
group
> via Yahoo at work but if not I'll get back to my mail around 6pm.
>
> Ian D
>
>
>
>
>
> For more information: http://www.automatedhome.co.uk
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>

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