cdrom power adapter

8/12/2019 CDROM Power Adapter

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How to make a simple CDROM Power dapterThis is a quick and simple project that shows you how to create a power adapter for your CDROM to play CDs withoutthe use of a computer or its bulky PSU. It requires minimal components and can be done in a relatively short time.

IntroductionI did some research on the internet about stand alone CDROM players and found that most of them were poweredfrom the same bulky PSU that came from the computers. There were also some that had a smaller custom powersupply that were less cumbersome and more attractive. I had the idea to build my own custom adapter based on theparts I had and the compatibility of the items.

To power the custom adapter, I chose to use a laptop charger/power supply that had a power rating greater than thepower consumption of the CDROM. In my case I had a 24V 24Watts power supply and a 18V 24Watts power supply.Since the CDROM required both 5V and 12V to operate it, a voltage regulator of the corresponding voltages will be

required. From my knowledge of voltage regulators, I know that to dissipate less waste heat from the IC, the inputvoltage show be around 2V above the output voltage in order to work properly. So with this in mind, using the 18Vpower supply was the better choice.

The 18V power supply rating of 24Watts was just above the power consumption of the CDROM which was:

5V * 1.0A = 5W

+ 12V * 1.5A = 18W

Total of 23Watts

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ROM Power Adapter http://ww w.mrjentis.com/cdplayer_adapter.html

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With a adequate heatsink, the 1A voltage regulators I was planning to use could handle up to 1.5A which was the exactamperage the CDROM needed on the 12V input. You can see a sample datasheet here.

If your CDROM consumes more that 1.5A on either line, you should add a current booster to the circuit.

The setup I have was cutting it real close on the margin of maximum power output of the components.

Here is the simple circuit schematic that was need for the power supply. I used the same heatsink for both of the ICs.

Here s a video of the initial testing of the CDROM

I used my Case/Safe to do this project.

Things you needHere is a short list of the things you need:

7805 series voltage regulator7812 series voltage regulatoradequately sized heatsink(s)small perforated breadboardheatsink compoundpower jack connectora short section of a molex connector wire

If you need more current on the output, refer to this page for the additional components.

Here's two snapshots of the components I used in this project.


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Apply the heat compound/ thermal paste to the ICs and mount it to the heatsink.

Insert the assembly at a suitable location on the breadboard and punch slots on the board to mount the power jackconnector.

Secure the connector to the board and solder the all the leads to the breadboard. I built this power adapter using toparts I got from my collection as shown in the background.

You need to make sl ightly bigger holes in the board to solder the output wires. Here's a another snapshot of metinning the wires to be soldered to the breadboard.

Wire the breadboard using the schematic above. Please note that you cannot take the input voltage of the 5V regulator


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from the 12V regulator output. You could theoretically, but that would require a current booster on the 12V regulator.It is best to take the power directly from the power jack as shown in the photo above (red wire).

Here's a close up of the wiring.

To insulate the underside of the circuit board, I screwed a plastic cover from a small plastic box to act as a base.

This is the final result of the project. A small and simple power supply adapter for a typical CDROM.

Here s the complete original video

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cdrom power adapter

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