Every now and then I get requests for information which is often easy to
find on the net by due diligence. It surprises me how few even make the
attempt, just coming up with a need, then sending an email to others to
do their homework.
It is a bit disconcerting when I can take 3-10 minutes or more of
surfing and pull up what they wanted and more, which tells me they
didn't look or didn't understand the process.
I'm not aiming this at anyone in particular as it results from the
frequent emails I get privately asking for information that is often
very easy to locate, if one just looks.
I try to do as much homework as I can when trying to find something or
figure it out, only then to ask someone who might have another
perspective or possibly access to other information.
So please, use the search engines, retry if you can't find it as typed,
use the newsgroups too.
My favorite search engine is http://www.altavista.com
For gossip or newsgroup information http://www.dejanews.com
For alt sci http://www.keelynet.com/search.htm
For this discussion list http://www.keelynet.com/interact/search.html
Most of the time what is beign asked about I find on just those 4
sources, though there are many others.
However, the main point of this post was to share some information about
inverters that I found on the net. The writer seemed to be concerned
that inverters might not be available after Y2K so wanted the circuits.
That same logic of non-availability would apply to electronics so the
logic doesn't follow, at least to my view.
I have a few inverter circuits but for hoots I did his homework for him
on the net and found several circuits, though it is cheaper and easier
to buy them as preassembled modules.
So we'd have some mechanical source of rotation that would drive a
generator to produce DC, that DC would charge a bank of batteries in
parallel for sustained high current.
This direct current at 12VDC would be wired into the breaker mains of
the house, feeding an inverter which would convert the 12VDC to 120VAC
which would feed the outlets for that particular circuit breaker branch.
To the end user, there would be no perceptible difference from grid
power.
---------------
Now, most people do indeed use AC which is true though DC in short
distance environments works much better since there is minimal energy
loss from resistance heating.
Since most appliances and electronic devices in their off the shelf
configuration use AC, then you have two choices....one is to modify the
internal circuitry of those devices which currently take AC and convert
it to DC internally, OR produce the AC from the inverter and just run
them as is, a much easier proposition.
A basic generator produces DC AND you are wanting to convert it to AC
with an inverter which are off the shelf and readily available for
purchase now.
This all smacks of paranoia and the insanity of the y2k fears ramped up
by the conspiracy buffs.
I think you logic is serverely in error because;
1) IF you have the schematics to build an inverter
2) AND you cannot buy off the shelf inverters
3) then you ALSO cannot buy the electronics to BUILD an
inverter either
all following from the erroneous idea that y2k or some global
catastrophe will deplete availability of the inverters AND THE
ELECTRONICS to build them, so it makes no sense.
If nothing happens, then its all a moot point.
If something happens, then you can't buy inverters or electronics, so
your quest for inverter circuitry makes no sense.
I have several inverter and converter circuits which are easily
available in off the shelf circuit design books and even in online
patents if you'd care to check them out.
An inverter is basically a fast switch that modulates DC or more
precisely chops it into square wave pulses which are then smoothed out
to simulate a sinewave. Some call it a 'power oscillator' which is fed
with DC to produce high current AC waves at a chosen frequency.
Here is the homework I did for you for what its worth.
Circuits;
12VDC to 120VAC inverter;
ftp://ftp.armory.com/pub/user/rstevew/CCTS/dc-120vac.cct
Transistorized inverter;
http://electronicsforu.com/efyhome/circuit/CIR49.HTMl
another circuit;
http://www2s.biglobe.ne.jp/~se-inoue/e_ckt8.htm
------------------
Patents;
120 and 220 VAC DC to AC inverter;
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=5&u=/netahtml/search-bool.html&r=243&f=G&l=50&co1=AND&d=pall&s1=
'AC+inverter'&OS="AC+inverter"&RS="AC+inverter"
cooled DC to AC inverter;
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=6&u=/netahtml/search-bool.html&r=268&f=G&l=50&co1=AND&d=pall&s1=
'AC+inverter'&OS="AC+inverter"&RS="AC+inverter"
Series resonant DC to AC inverter;
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=49&f=G&l=50&co1=AND&d=pall&s1=
'AC+inverter'&OS="AC+inverter"&RS="AC+inverter"
A patent showing how to use an idling car engine to provide AC power;
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=25&f=G&l=50&co1=AND&d=pall&s1=
'DC+inverter'&OS="DC+inverter"&RS="DC+inverter"
Solar cell powered DC to AC inverter air conditioner;
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=18&f=G&l=50&co1=AND&d=pall&s1=
'AC+inverter'&OS="AC+inverter"&RS="AC+inverter"
---------------
Good luck.
-- Jerry Wayne Decker / jdecker@keelynet.com http://keelynet.com / "From an Art to a Science" Voice : (214) 324-8741 / FAX : (214) 324-3501 KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187