RE: IR PCB Tx sees the light....

["Ian B" <I.Bird@xxxxxxx>]

I feed mine 12 volts so I don't know about 9v. I seem to remember something
about 20 milliamps in a previous mail bt the maths is down to you. I will
put a meter on mine and try and find out. Since it is hard wired anyway is
two more wires that great a penalty for reliability?

Ian

-----Original Message-----
From: rj@xxxxxxx [mailto:rj@xxxxxxx]
Sent: 29 November 2000 20:07
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] IR PCB Tx sees the light....


Im just finishing off mine now, and deciding on power supply options, can
these run of a 9v battery if so for how long?? the less wires, powerpacks
and powerpoints used the better.

regards and thanks again.



-----Original Message-----
From: nigel@xxxxxxx
[mailto:nigel@xxxxxxx]
Sent: Thursday, 30 November 2000 8:34
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] IR PCB Tx sees the light....



> start somewhere. Are you OK with my distributing the PCB's as below

Thanks for asking- yes, that's OK- I'll just take royalties when
profits are being made :-)

> signal goes low from the TSOP and hold pin three on the IC high for
> the
> transmitter in the same room.

That's probably not the best way- Nick B is probably thinking along
the right lines by blocking the TSOP signal when the 555 is
oscillating.  I've not thought about it in detail, but I'd suggest a
transistor base connected to RST' via a 2k resistor, with collector
to the TSOP output and emitter to the bus.  Assuming a PNP
transistor, basically it passes current from C-E when the base input
is high (that's very vague, but I'm not about to try to explain how
transistors work- there are plenty of good books for that!).

It might work with a pnp transistor, but I'd suggest a FET would be a
better bet.

That's the vague idea, but I've not got a more detailed plan for it
(yet!)

There is other room for improvement, to produce a more stable
oscillator and a better LED driver circuit (transistor biasing etc).
The website circuit was a true 'back of the envelope' design, not
designed for production... if I'd expected this much interest I'd
have done it better!

Nigel









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