DIY MP3 radio

[edouble101]

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?

[Hakimi]

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...

[edouble101]

Originally Posted by Hakimi

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.

[Hakimi]

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..

[KatieandDad]

Originally Posted by edouble101

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.

[KatieandDad]

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.

[edouble101]

Originally Posted by Hakimi

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

Originally Posted by KatieandDad

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)

[edouble101]

As promised here are some pics of my progress.











I didn't edit text to this pics

[edouble101]

5v regulator circuit






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

[edouble101]

Question!!!!!

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