27 Jul
2013
27 Jul
'13
12:51 p.m.
On 2013 Jul 26, at 2:47 PM, Tony Duell wrote:
I hope you're not addressing me, I wasn't the one who simulated it.
Apparently Rik felt like doing so. More power to him. But of course
everyone should be able to understand it in their head, right off the
bat, like Tony can. Tony's smart, why aren't 'you'?. (Anyone reading:
heavy irony intended).
Rik wasn't working from the simple HP circuit, he was working from
your mis-drawn circuit, which isn't quite so obvious as to how it
would behave.
Earlier, I could have said: the circuit as you (Tony) drew it is so
obviously unusual for the task you should have double-checked it as
you drew it, and the error never should have made it into your
schematic. But I didn't. Out of politeness.
Where are youre results/descriptions of this? Rik has desciribed
what he
did, you have (quite probably correctly) found errors in it. But I
don't
see your work published anywhere.
Where are the online notes, available for perusal, for all the
repairs you claim to have done?
Oh, right .. just ask.
Many of my repair logs are online, I have a log for the 9830, it's
not online yet and it wasn't pertinent here, nor do I know what point
you see in it here. I was responding to Rik's implication as to my
experience with the circuit, not comparing technical data. If Rik
wishes to discuss the technical aspects, I'm here.
I was able to discern the errors by looking at the photographs of the
board in Rik's article, which kind of suggests I have some degree of
acquaintance with the board and circuit.
There you go. You just had to turn it into a pissing match, didn't you.
I'm not concerned with who has done 'more', if you've done 10,000,
wonderful. And I wasn't the one who brought the 'count of RE'd items'
into the discussion.
Geez.
In your
simulation, you used resistances for the LDR of 74K dark and
I fial to see why you need to 'simulate' this circuit. The actual
comparator circuit, whether the origianl HP one iwth no feedback or
the
intended modification is simple enopug hthat you can understand it in
your head. I wrote it because it's a working (tested)
solution for an actual
problem.
AND you can't just replace the CDSe type with a normal off the
shelf LDR
that doesn't work, I tried..
So be careful before just shouting something without testing it!
I'm not shouting, I am being careful - far more than you, and I have
repaired and done a fair degree of experimentation with these sensors
(in one instance replacing the lamp/LDR pair with an IR LED/
phototransistor pair, and it didn't require any changes to the
comparator circuit). I haven't
counted how many items I have reverse engineered, but it's
many dozens, over a hundred I expect depending on what level of
Is that all :-)?