Connecting 200 LEDs to AC (120V)?

[Homer]

Hi All,

I am planning to remove the light fixture from one of our rooms and put
200 LEDs instead. LEDs are going to be:

Reverse Voltage:5.0 V
DC Forward Voltage: Typical: 3.4 V Max: 3.8V
DC Forward Current:20mA

How can I connect them all to a AC outlet (110V or 120V? in Canada).

I believe I need to put a "bridge rectifier" to prevent blinking and
they should be mixture of parallel and series.


Thanks if advance,

Homer

 

[Homer J Simpson]

I am planning to remove the light fixture from one of our rooms and put
200 LEDs instead. LEDs are going to be:

How can I connect them all to a AC outlet (110V or 120V? in Canada).

Why?

 

[Homer]

The same reason that people put Halogen instead of old bulbs.
it's cool and looks better (in my point of view)

 

[[email protected]]

The same reason that people put Halogen instead of old bulbs.
it's cool and looks better (in my point of view)

Don't top-post. Just buy LED bulbs. Don't build your own. Did you ask
how to connect tungsten wire by yourself to 120V instead of buying
incandescent bulbs?

 

[Joel Kolstad]

Don't top-post. Just buy LED bulbs. Don't build your own. Did you ask
how to connect tungsten wire by yourself to 120V instead of buying
incandescent bulbs?

That's not really a fair comparison. A fair comparison would be someone
asking to build their own (120V) Chrismahanukwansika lights by stringing
together a bunch of low voltage (e.g., 6V) bulbs...

 

[John Woodgate]

Don't top-post. Just buy LED bulbs. Don't build your own. Did you ask
how to connect tungsten wire by yourself to 120V instead of buying
incandescent bulbs?

Well, no, you wouldn't, because you can't buy vacuum in small
quantities. (;-)

 

[Homer J Simpson]

The same reason that people put Halogen instead of old bulbs.
it's cool and looks better (in my point of view)

LED's aren't rated to go open circuit on 110 VAC. I'd use a transformer.
Yes, you'll need a bridge rectifier unless you wire them back to back which
means twice as many.

 

[petrus bitbyter]

Hi All,

I am planning to remove the light fixture from one of our rooms and put
200 LEDs instead. LEDs are going to be:

Reverse Voltage:5.0 V
DC Forward Voltage: Typical: 3.4 V Max: 3.8V
DC Forward Current:20mA

How can I connect them all to a AC outlet (110V or 120V? in Canada).

I believe I need to put a "bridge rectifier" to prevent blinking and
they should be mixture of parallel and series.


Thanks if advance,

Homer

Four strings of 25 LEDs in series each with a 1k2/1W series resistor. These
strings in parallel and connected to the rectifier.

petrus bitbyter

 

[Bob Myers]

Well, no, you wouldn't, because you can't buy vacuum in small quantities.
(;-)

You USED to be able to, though...I remember the local
drugstore had small glass vials of vacuum available for sale,
right next to some electronic thingy that was supposed to be
able to test them and (I guess) tell you if the vacuum inside
them was still good....

Ah, those were the days...

Bob M.

 

[Genome]

Hi All,

I am planning to remove the light fixture from one of our rooms and put
200 LEDs instead. LEDs are going to be:

Reverse Voltage:5.0 V
DC Forward Voltage: Typical: 3.4 V Max: 3.8V
DC Forward Current:20mA

How can I connect them all to a AC outlet (110V or 120V? in Canada).

I believe I need to put a "bridge rectifier" to prevent blinking and
they should be mixture of parallel and series.


Thanks if advance,

Homer

I do not believe that you would be able to connect 10 Leds together and make
them look good, let alone 200 of them.

So, before I am interested, I would like to see some aesthetic proof of
concept.

DNA

 

[colin]

Hi All,

I am planning to remove the light fixture from one of our rooms and put
200 LEDs instead. LEDs are going to be:

Reverse Voltage:5.0 V
DC Forward Voltage: Typical: 3.4 V Max: 3.8V
DC Forward Current:20mA

How can I connect them all to a AC outlet (110V or 120V? in Canada).

I believe I need to put a "bridge rectifier" to prevent blinking and
they should be mixture of parallel and series.

Well at the risk of telling you how to do something that might get you
electricuted if you dont know what your doing ...

You could try and string 25 leds in series, this gives 90v fwd, youl have 8
of these strings
conect them in parallel pairs, then conect two of those pairs in anti
parallell
add a series resistor wich I estimate about 250 ohms, but might be best to
start with say 1k

repeat for the other 4 strings.

conect to safety isolated 115 supply, stand well back, push switch with a
long broom,
.... fetch fire extinguisher, wish youd got some1 watching at a safe distance
to ring for ambulance ...


Colin =^.^=

 

[Genome]

Well, no, you wouldn't, because you can't buy vacuum in small quantities.
(;-)

Exactly, but that is just your own perception of things. I also have a large
volume of empty head and would have problems with selling it due to the
packaging.

However, I am sure that you might be able to create the experience.

NOM - No Offence Meant
DNA

Yes, I know about the Governers attempted homosexual adventures with what
turned out to be a woman. Is it relevant to your 10% or your new request for
15%?. Is it relevant that your wife makes a really poor man?

I can get this built next door. Ugly Bitch.

This e-mail in no way represents the opinions of any people who might be
made to look bad if they were associated with it unless you were the person
who was meant to receive it in the first place which is OK because we have
more dirt on you than you would care to imagine and we'll make some more up
and it will stick.

If you have received this e-mail in error then please delete it immediately.
Do not even consider the possibilities. The consequences are something you
do not need to deal with.

Thank You

 

[BobG]

120 x 1.414 gives 170V peak after the rectifier. So I'd try 4 strings
of 50.

 

[Michael A. Terrell]

Well, no, you wouldn't, because you can't buy vacuum in small
quantities. (;-)

Buy? What, are you crazy? When I was a kid we had to make our own
vacuum with homemade hand cranked vacuum pumps! Of course, the jerry
rigged diffusion pumps were a lot harder to crank, to finish off our
home brew CRTs!


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[John Woodgate]

When I was a kid we had to make our own vacuum with homemade hand
cranked vacuum pumps!

You had hand-cranked vacuum pumps? We had to get six kids into line to
suck simultaneously.

 

[Simon Dice]

colin ha escrito:

conect to safety isolated 115 supply, stand well back, push switch with a
long broom,
... fetch fire extinguisher, wish youd got some1 watching at a safe distance
to ring for ambulance ...


Colin =^.^=

I have conected 5 strings of 34 white LEDs (5mm) to a rectifier bridge
with a current regulator (LM317HV)(for each string) and it works fine...

 

[petrus bitbyter]

Four strings of 25 LEDs in series each with a 1k2/1W series resistor.
These strings in parallel and connected to the rectifier.

petrus bitbyter

Oops. 200 LEDs require 8 strings of 25.

petrus bitbyter

 

[nospam]

LED's aren't rated to go open circuit on 110 VAC. I'd use a transformer.
Yes, you'll need a bridge rectifier unless you wire them back to back which
means twice as many.

Transformers are not rated to go open circuit on 110 VAC either.

--

 

[Michael A. Terrell]

You had hand-cranked vacuum pumps? We had to get six kids into line to
suck simultaneously.

Only six? That must have really sucked!


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[John Fields]

You had hand-cranked vacuum pumps? We had to get six kids into line to
suck simultaneously.