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Old 10th January 2012, 01:23 AM   #11
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Will this power supply work? If I could use an external power supply that would be great. Would I just run the - and + to a distribution strip (one set of power to the amp another to the LM317 circuit)inside the MP3 cabinet?
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Old 12th January 2012, 11:24 PM   #12
Hakimi is offline Hakimi  Malaysia
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for your simplest way to power-up MP3 module is 5V right ?
If me, I will use any USB charger which the output is 5V 500mA-1A
and for amplifier, just use normal transfomer with caps. rather using lappy PSU which is based Switching Mode Power Supply (SMPS)...

Just an opinion...
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Old 13th January 2012, 08:41 AM   #13
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Quote:
Originally Posted by Hakimi View Post
for your simplest way to power-up MP3 module is 5V right ?
If me, I will use any USB charger which the output is 5V 500mA-1A
and for amplifier, just use normal transfomer with caps. rather using lappy PSU which is based Switching Mode Power Supply (SMPS)...

Just an opinion...
Thanks for the tips. I decided to use a smaller internal amplifier. This allows me to use an outboard 12v power supply that I will step down with a 7805 for the 5v.

Thank you all for your help.
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Old 13th January 2012, 02:30 PM   #14
Hakimi is offline Hakimi  Malaysia
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welcomes...
previously i have built an intergrated amplifier with preamp and MP3 player
have a look.. https://www.facebook.com/media/set/?...3&l=075c4799a2

This set built for Final Year Project for my diploma..

regards..
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Old 13th January 2012, 02:35 PM   #15
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Quote:
Originally Posted by edouble101 View Post
Excellent recommendations! Thank you very much.

I am researching the LM317 and have found this video helpful.

Should the heat generated from the LM317 with a 24v input and a 5v output be a concern?

The data for the MP3 decoder is insufficient to know what the current draw will be.


Generally the lower the voltage, the more current is required.

In that case the LM317 might need a heatsink.
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Old 13th January 2012, 02:50 PM   #16
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There is a mention of 3W POWER RELEASE - I've no idea what our Oriental friends are talking about there.

If we double that for a guestimate - 6W and add a few watts to 10W we are looking at 2A at 5V.

In this case the LM317T is going to need a serious heatsink.

24-5 = 19V. 19V x 2A = 38W

The heatsink would cost more than a low voltage transformer dedicated to producing the 5V.

Having said that. There are a LOT of old computers on the scrap heap that have heatsinks that are used to dissipating about 60W.

Be careful of USB power supplies - we dont know what current this thing needs.

Last edited by KatieandDad; 13th January 2012 at 02:55 PM.
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Old 14th January 2012, 12:13 AM   #17
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Quote:
Originally Posted by Hakimi View Post
welcomes...
previously i have built an intergrated amplifier with preamp and MP3 player
have a look.. https://www.facebook.com/media/set/?...3&l=075c4799a2

This set built for Final Year Project for my diploma..

regards..
Cool project

Quote:
Originally Posted by KatieandDad View Post
There is a mention of 3W POWER RELEASE - I've no idea what our Oriental friends are talking about there.

The 3w power release is the onboard amplification for speakers per channel.

If we double that for a guestimate - 6W and add a few watts to 10W we are looking at 2A at 5V.

In this case the LM317T is going to need a serious heatsink.

24-5 = 19V. 19V x 2A = 38W

The heatsink would cost more than a low voltage transformer dedicated to producing the 5V.

Having said that. There are a LOT of old computers on the scrap heap that have heatsinks that are used to dissipating about 60W.

I picked up a 7805. I will be stepping down a 12v power supply to 5v. The MP3 decoder and another gizmo I am throwing in the mix shouldn't draw more than 1.5A.

Be careful of USB power supplies - we dont know what current this thing needs.
I ended up buying a Parts Express MP3 decoder a 12v 2a powers supply and a Dayton Audio 15w x 2 amplifier. I also picked up a 7805 and a few other things that you guys will have to wait to see

Once I get this project started I will post pics of my progress (and probably some more questions)
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Old 28th January 2012, 01:05 AM   #18
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As promised here are some pics of my progress.

Click the image to open in full size.

Click the image to open in full size.

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I didn't edit text to this pics
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Old 28th January 2012, 01:11 AM   #19
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5v regulator circuit
Click the image to open in full size.

Click the image to open in full size.



Video that I can not figure out how to thumbnail post
http://www.youtube.com/watch?v=5fb9q...e_gdata_player

Last edited by edouble101; 28th January 2012 at 01:30 AM.
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Old 28th January 2012, 01:19 AM   #20
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Question!!!!!

I bought a double sided circuit board at Radio Shack. How can I etch off one side without over etching the circuit side?
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