RE: Re: Hmevision ir transmitter

["Ian B" <Ian@xxxxxxx>]

Don't forget to common all the grounds.

I would suggest you do this in stages and the first one is to connect
the
2N2222 base to the HV +ve IR output via a resistor, something like 1k
should
do it. Then connect the collector to +ve via a resistor and the IR LED,
100
ohms should be good. Connect the emitter to the ground of the power
supply.
With the HV ground and power supply ground connected try a test IR burst.
If
the equipment does not respond then change the LED for a visible one and
see
if it flashes dimly?

Let me know

Ian

>-----Original Message-----
>From: andy_powell_is [mailto:ukha@xxxxxxx]
>Sent: 30 May 2002 19:59
>To: ukha_d@xxxxxxx
>Subject: [ukha_d] Re: Hmevision ir transmitter
>
>
>
>Ian,
>
>I'm actually stubling at the first hurdle here...
>
>I have :
>
>One one breadboard with a 5v supply a BC182, C is connected to +5v
>via a resistor, B is connected to Ground (via a push switch) and E
is
>connected to the B of a 2N2222 on another breadboard with 5v supply
>(spearate from the first one). The C of the 2N2222 is connected to
2
>LED's in series with a 220ohm resistor and the E is connected to
the
>ground of the supply on this board.
>
>I expected the LED's to light up - guess what? It does nothing :(
>
>Any ideas???
>
>I thought it was the circuit I'd drawn (uploaded to the files area)
>before...
>
>Andy :(
>
>
>
>
>
>--- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
>>
>> > I noticed that you said you were using 3 port pins, which
sounds
>> > better than using 8...
>>
>> Andy
>>
>> I think Frank has built this round a 3 to 8 decoder which
means
>only one
>> zone could be active at any on time. Using all 8 pins of port
A
>gives you
>> any combination you want simultaneously.
>>
>> Ian B
>
>
>
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