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Nowadays, we use more and more electronic products in our daily life, like laptops. After the laptops damaged, the power adapter of them are often useable. But people usually throw it away because they have no other ways to be used. We did some modification on laptop power adapter, and modify it to a USB charger for rechargeable batteries, mobile phones , iPads ,etc. Because of its high power, it can charge 8 electronic devices at the same time. In fact, the 90 Watt adapter is able to charge 8 iPads, without worry about the power. In this way, the power adapter of our laptop can be reused, and be useful in our daily life again. In this manner, we achieved our goal of reusing old electronic product for our daily life.

Step 1: Preparation of Materials

Materials:

1 old laptop power adapter ( 90 Watt, 19 volt output);

8 Voltage-transform boards;

PMMA board(cut into the shape of the case by using a laser cutting machine);

Pillars, screws, wires and other materials may be used.

Step 2: Assembly of Components

First, connect wires to the voltage-transform boards. Then, test each voltage- transform board by connecting it to the 19V power supply to make sure the boards are fully functional. Connect the boards with pillars. Then, separate and Binding the wires connecting with the positive pole and the negative pole. After that, put the wires in order.

Cut the DC-side wire of the adapter. Find out the positive wire and the negative wire, and connect them to the wires that connect with the voltage-transform boards. Then, use black friction tape to make sure it is insulation and reliable.

Step 3: Assembly of the Case

Drill 4 holes on the left and right side boards of the case. Install the voltage-transform boards which connected by pillars to left and right boards tightly with screws and nuts .Put the adapter under the voltage-transform boards, then mark and drill 4 holes near the adapter.

Use cable tie to fix the adapter to the baseplate and make sure it is immovable. Put the wires in order , then tie them with cable tie. Glue all the boards of the case together with the PMMA glue except the lid . Check the wires again. If there is no connecting error, cover the case with the lid.

Step 4: Test the Device

Energize the device, check the LEDs on the voltage-transform boards. They should all be lighted up. Use the multimeter to check the voltage of each USB port. If they are all functional, try to charge electronic devices. If it works, we achieved our goal .

As the result, this device can charge 8 electronic devices at the same time. As shown in the pictures below.

<p>I have a HP power adapter rated at 65W, 19.5V @ 3.33A, can i use just 2 or 3 of these modules instead of 8?</p>
<p>Please post a link for the source of the &quot;voltage-transform board&quot;.</p>
I brought it on a website called Tmall. Here is the link:<br>http://detail.tmall.com/item.htm?id=35617667205&amp;spm=a1z09.2.9.118.HIUgw5&amp;mt=
<p>I believe it's a buck converter that has output as USB a quick search resulted in this :</p><p>http://www.ebay.com/itm/5V-USB-DC-7V-24V-to-5V-3A-Step-Down-Buck-KIS3R33S-Module-for-Arduino-LM2596-/291121604116?pt=LH_DefaultDomain_0&amp;hash=item43c8332614</p>
<p>the only thing that would make that look better is a couple of leds to brighten it up a bit</p>

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Bio: 徐延康 清华附中 G1302 15810604698 15810604698@139.com 徐延成 清华附中 G1305 15810604685 xuyancheguge@gmail.com
More by 徐延康:8 Ports USB Charger Made by Old Laptop Power Adapter 用旧笔记本电脑电源改造8口USB充电器 
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