Hello, I am wondering if anyone knows the pin layout for a l7812acv cc077
v6
march 819 and a l7912acv gk243 vw chn 734. The products where purchased
via
newark.com from ST electronics. I checked the datasheets and the three
that
I have read all provide different pin layouts. I like to be sure that I
get
the pins right before I start pulling from the transformer - it's just a
minor issue but the koreans TL431 datasheet is much different than the
ones
that are available to US citizens.
Also I cannot access ``datasheets.com'' or any of those sites do to
security
problems that my browser will not pass through (I do not use adobe reader
or
internet explorer so I can't OLE the do***ent into the web browser (this
was
done by choice on my part)).
I will try and draw a picture of the chips. I will use a convention that
seems to be unknown to most IC design companies - I will label the legs.
The drawing assumes that, like a good plumber, you are staring at the
front
of the chip whith the writing eye level so that the chip can be read and
identified without having to roll around on the floor like a jackass -
(yes,
I know a quarter turn really doesn't get the air pockets out of the glue,
but the directions say it is a good idea and it seems like one being that
I
leaked 100 gallons in my hydroponic system because of a slow leak caused
by
bad priming.)
----------------
/ \
| _ |
| | | |
| | | |
| - |
|=--------------=|
| l7812ACV |
| - |
\ /
| |
/ \
| |
| |
| 691 (ST?) |
| 0 |
----------------
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
----------------
/ \
| _ |
| | | |
| | | |
| - |
|=--------------=|
| l7912ACV |
| - |
\ /
| |
/ \
| |
| |
| 691 (ST?) |
| 0 |
----------------
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
In the above pictures I will be refering the the vertical string of digits
`1' as pin 1. I will be refering to the vertical string of digits `2' as
pin
2. I will refer to the vertical string of digits `3' as pin 3. The casing
will not be refered but assumed to be the conductive metal part on the
backside of the chip and in the drawing topside =--= (just in case ground
goes to emitter or some bull**** like such).
Can some kind sole please tell me what pin 1, pin 2, and pin 3 are in
terms
of input, output, and ground; or if I should just throw this junky piece
of
**** out. I like using voltage regulators to test my transformers voltage
jump because I don't care if I melt a piece of plastic **** and I also use
them to test the current because I know that the keen senses of the
datasheet droids would never lie or just omit information about the amount
of current that a regulator can withstand over unknown time limits at
uncertain temperature conditions. We all know that they all just pull 1.5
amps with a heat sink and output 1.5 amps over an infinite timespan under
-/+ time / heat fluctuations. Like duh, why don't you just buy a new chip
that does what you want when we can't even get the ****ing pin labeling
right on the old chip. I can proudly say that some of my transistors have
the letters `e', `b', and `c' etched into their holding containers (if I
could figure the color codes on the back I'd be really happy).
Sorry for the aggrevated tone, I just lost radio signal and am now being
swamped by transformer hum. I would like to investigate what the ****
happened. I think it might be my using the lm358 improperly - but who
knows
when the control is a piece of marketing propaganda and the variable is
the
flucuation of the petro-pegged dollar bill.
I would appreciate emails (this is not like a 44 pin plcc or padded device
-
it's just ****ing annoying). The problem with email is that my ``new''
cable
company does not seem to send me my email. In order to get my 911 service
and email turned on I must return to them their transponder (like what the
**** is a transponder and how do I have it? (another question for the
audience ...)).
thanx... sorry for the bad language.
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