Re: Electronics Gurus brain required...

["andy_powell_is" <ukha@xxxxxxx>]

Ian,

--- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
> Spot on Andy. The tranny TR1 only needs to be small as there is no
current
> flow. TR2 however takes the full flow from up to x number of 
emitters so
> needs to be suitably sized. It also needs to switch at a rate 
suitable for
> IR transmission.

What sort of 'size' should I e looking at for TR1 and TR2? I don't 
actually have any (still building up my component stockpile :) ) any 
Ideas for makes and/or part numbers?? I've not used anything like 
this before so any advice would help :)

> guess you could have lots o small caps at each diode take off or 
one near
> the power supply that is larger. Trial and error here is good as 
long as
> they are connected up correctly.

Are you talking pico farrads for the individual ones? or something 
more substantial? And for the single one by the PSU.. again rough 
guesses are fine as I can buy a few with different values...

> 
> For testing purposes I would build the circuit up from the IR end 
back
> towards HV testing each bit worked. If not you may end up with a 
non working
> circuit and not the foggiest where it is going wrong.
> 

Methinks that will happen anyway :P


> Hope this is helpful

very much, thanks Ian


> 
> p.s. Babs arrived so my time is a little short at the moment and I
am
> knackered!! Mum and daughter doing well, no names decided on yet.

Congratulations! As for names - well Baby Paws has been taken :P

Andy

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