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I would love to see the face on the sales agent in China/HKG for the manufacture of these LED off of eBay. I wonder what he/she say to themselves as to why all these Americans  and others are purchasing all these LED at once. LOL As soon as they post it at a low price they are gone (more or less). Please remember it is Chinese New Year and they are closed for a week or two so your shipment will be delayed until they open and process them.

I am using Track power for passenger cars. using the circuits that GRjohn has done and others.  there are really easy hand drawn diagrams of the setups, components, etc. to make a small board on JC studios. Originally Posted by moed321:

Now that we all have the LEDs, I would like to see a picture of how you are powering them.

 

An e-package is moved via  China Post Office. Mail no longer moves via Sea Freight unless to specific request it (This option is NOT available with USPS). So this will move via air freight. The question was raised how they can move it so cheap from China to here. The cost are lower in China as we all know. The Universal Postal Union are agree rates that each postal service will charge a foreign postal service to move the package or letters. Example China Postal service will get the mail to LAX and the USPS will then move it to final destination USA. USPS will charge China Postal service for service moving the letter or package to final USA destination via the Universal Postal Union. And yes I have over 24 years of international transportation experience.

Dear John

 

They are "dumping" the electronics parts at below cost to get a foot hold on sales in the USA. This is were Congress or US Customs gets involed and slap on a counter valing duty to bring it back to market prices. I have not heard anything lately that Congress or Customs is going after the Chinese exporters. But that is also subject to change.

 

In regards to the Universal Postal Union I do not what agreement is between the US and China.  I do know that there complaints about how cheap the Chinese exports can send their goods to US and expensive it is to send goods to China.

 

Customs can hold anything until they are good and ready to release it. So do not be surprised that they hold these goods that long or longer.

 

I assumed they had to be below cost, because I couldn't even make the blank PCB for what I get these products for and shipped as well!  I know Customs can sit on stuff for months at times, I don't order anything from the overseas sources that I need right away.  My primary parts suppliers are Digikey and Mouser, great selection, reliable, good prices, and lightning quick shipping.

Its funny too that they discount the price even more when you buy 3 reels.  its cheap already and they make them even more.  Now, I paid shipping on mine.  but its like 2.50 for E-packet.    I got lots of work to do anyway.  I can wait!  its so cheap not to wait.  why pay 15-20 dollars a roll for same thing? 

I received following email today from a Chinese vendor:

 

Dear friend:Hello,How are you?Sorry to write this message to disturb you.Feb.19th is our National String Festival.We will have a long holiday from Feb.14th to Feb.26th.Every delivery company are date off,so will will close the store during these days.If you have any questions,please leave a message to us or contact us after Feb.26th.We will reply you soon.Please wait patiently.Thank you for understanding.Best regards.(Please don't reply this message,thank you.)

 

 

Originally Posted by RJR:

I received following email today from a Chinese vendor:

 

Dear friend:Hello,How are you?Sorry to write this message to disturb you.Feb.19th is our National String Festival.We will have a long holiday from Feb.14th to Feb.26th.Every delivery company are date off,so will will close the store during these days.If you have any questions,please leave a message to us or contact us after Feb.26th.We will reply you soon.Please wait patiently.Thank you for understanding.Best regards.(Please don't reply this message,thank you.)

 

 

I got pretty much the same message from an Aliexpress vendor. the shipping company will be offline till about the same date, so the 'purchase protection' feature was extended into March so the item has a chance to reach me (under Aliexpress rules, the seller doesn't get paid--Aliexpress holds the payment in escrow--till the buyer signals they have received the goods in acceptable condition).

 

---PCJ

Originally Posted by RJR:

So what do you do if you need 1 1/4 watt 330 ohm resistor and you need it right now?

I open the drawers where I have resistors from 1 ohm to 10 megs in 5% steps and take one out.

 

Seriously, these things are not an emergency, and waiting a couple of days to get a component is not the end of the world.  The kit posted by Pete is a good thing to have on hand if you're doing stuff with electronics.

 

 

Originally Posted by richs09:

...

For those of us with mixed systems - meaning some track with variable voltage transformer control, would your board work to produce constant lighting?

 

The boards referenced elsewhere in this thread (e.g., the board at aliexpress) seem to be 'buck-boost' systems that handle variable input voltage.  What I can't tell is whether they have a capacitor in the circuit to eliminate the light flicker as the car moves on the track. 

...

Be mindful when ordering online DC-DC modules.  Several are mis-identified as being "buck-boost" when they're really only "buck" modules.  I've successfully gotten several eBay sellers to change their listings though I've now given up doing this with the language-barrier and lack of interest on their part - many are "just" distributors selling buck modules alongside ladies undergarments. 

 

A buck module only lowers the voltage (aka stepdown) whereas a true buck-boost module can both lower or raise the voltage (aka stepdown-stepup).  Since the voltage required by the LED strips is around 10-12V DC, you need a buck-boost type if you want to operate at lower conventional-control variable track voltages.

 

So here's a true DC-DC buck-boost module powering a 12V LED strip.  I had to add the 22uH inductor, bridge rectifier, and capacitor.  I am not aware of any AC-input buck-boost module (i.e., with bridge rectifier already on-board).

 

ogr buck-boost strip lighting

A detailed write-up on installing a buck-boost module for 12V LED strips is on the O gauge archives here:

 

http://www.jcstudiosinc.com/Co...-Using-12V-LED-Strip

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