Terry Given
Guest
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 Posted:
Thu Mar 17, 2005 6:10 am Post subject:
Re: Resistance of ammeter caused voltage drop |
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Larry Brasfield wrote:
| Quote: | "Terry Given" <my_name@ieee.org> wrote in message
news:XM4_d.10432$1S4.1095388@news.xtra.co.nz...
Clearly its pick-on-Larry O'clock, so here's my 2 cents worth:
I dont like your hat
Ouch! You guys sure know how to pile on. That's
very close to the most damaging blow so far. <g
Cheers
Thanks, and likewise.
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What can I say, I'm one of the people my parents warned me about :)
wrt OP, I once had the brilliant idea of incorporating -ve feedback into
a TL431-opto feedback circuit, by placing the LED resistor at the o/p
rail, then taking the o/p voltage feedback from the bottom of that
resistor in order to reduce the maximum gain and stabilise it (Aol is
all over the show for a TL431). OK, fair enough, it ought to work. In
order to test it, I slapped a Fluke87 (in mA mode) in series with the
TL431. The voltage drop across the ammeter was more than enough to screw
up the entire circuit (esp. since it was in the -ve feedback part), and
as I was being particularly thick that day it took several hours for me
to figure out why it didnt work.
Thats not so bad. What really hurt was my tech roaring with laughter
when he found out what I had done, then calling the other guys down for
a laugh. Perhaps it was revenge for the time I kicked him in the ankle
whilst his head was under a shelf - ouch clonk fuck OWTTE ;]
Actually it was probably payback for the time I gave him a dish
containing about 10,000 0603 caps (200 values), and asked him to sort
them out. Half an hour later, there he was painstakingly measuring each
one, until one of the other techs took pity on him and told him the
correct response to such a request was "piss off"
Cheers
Terry
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Rich Grise
Guest
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| Posted:
Fri Mar 18, 2005 1:49 am Post subject:
Re: Resistance of ammeter caused voltage drop |
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On Thu, 17 Mar 2005 16:45:16 +1300, Terry Given wrote:
| Quote: | Actually it was probably payback for the time I gave him a dish
containing about 10,000 0603 caps (200 values), and asked him to sort
them out. Half an hour later, there he was painstakingly measuring each
one, until one of the other techs took pity on him and told him the
correct response to such a request was "piss off"
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Was he getting paid by the hour? ;-)
Cheers!
Rich
--
Hlade's Law:
If you have a difficult task, give it to a lazy person -- they
will find an easier way to do it.
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