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Old 17th July 2012, 05:53 PM   #21
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for some reason the online stores I have checked don't seem to have the IC in stock.
but the store I have in mind for the other components are...

Capacitors | DigiKey

and

Jameco Electronics - Electronic Components Distributor

i'll keep searching for the TDA
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Old 17th July 2012, 06:52 PM   #22
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okay, i wait till You have some results.
Till then i check if i have any in my spare's bin.
If i have components at hand i will make a step-by-step build with You.
Sortha make a picture of every single step, and postng it for You.
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Old 18th July 2012, 03:28 PM   #23
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so far I've found these...

3300 uF 25 volt electro
R3300/25-VP-R: JAMECO VALUEPRO: Passive Components

470 nF alum
EEE-1HAR47SR Panasonic Electronic Components | PCE3934TR-ND | DigiKey

220 pf ceramic
DC220: JAMECO VALUEPRO: Passive Components

100 nf
MY.1: JAMECO VALUEPRO: Passive Components

TDA
TDA1557 Audio Amplifier 2-Channel,Stereo Class B 22Wx2@4(Ohm) 6V~18V SIL-13

I really wish I could find one site that had all this stuff, lol.
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Old 18th July 2012, 03:41 PM   #24
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Location: S.England
Well, the TDA1557 is available here as LM3886:

RS or Farnell.

They will certainly have all the other components you've listed above too.

Andy

Last edited by underwurlde; 18th July 2012 at 03:44 PM.
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Old 18th July 2012, 07:14 PM   #25
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lm3886 is a vastly different chip.
HEStore.hu - Elektronikai alkatrészek a legjobb áron!
here You can find all items needed for the amp, but shipping would be like 10 USD or so.

by the way, the parts You have found all seem to be okay, expect for one.
The 470 nf alum capacitor is not a good choice. its a surface mount capacitor, would be difficult to solder, not to mention alu caps are not the ones to use at the designated position.

keep it up, and i will promise to help You with building it.
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Old 18th July 2012, 07:31 PM   #26
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hmm, bit of update, the site that sells the IC seems to have everything needed.
470 nF capacitor
470nF 0.47uF 100V 5% Polyester Film Box Type Capacitor
100 nf capacitor
100nF 0.1uF 100V 5% Polyester Film Box Type Capacitor
220 pf capacitor
220pF 50V Ceramic Disc Capacitor
3300 uF /25 v capacitor
-> not found, but 4700 uF / 25 v is 100% okay to use
4700uF 25V 105C Radial Electrolytic Capacitor 16x26mm
battery clip
9V 9-Volt Battery Clip / Connector Snap
The IC
TDA1557 Audio Amplifier 2-Channel,Stereo Class B 22Wx2@4(Ohm) 6V~18V SIL-13

do not forget to get some heatink.
salvage something, old radio, blown computer psu, whatever..
without a heatsink, its not going to work.
3.5mm Stereo Plug
this should be helpfull too, as You want to connect this thing to a source.
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Old 21st July 2012, 05:42 PM   #27
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the stuff is on the way.

how big of a heatsink do I need? I found an old powered 4 inch subwoofer and the amp inside has a a couple heat sinks in it.
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Old 22nd July 2012, 05:14 PM   #28
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the bigger, the better.
say.. something in the size of a cigar box will do absolute fine.
How hot it wil get depends on how hard You drive the little amp.

It realy depends on what load will it have to drive, for testing even a small heatsink will do.
Later on You will see if You need a bigger heatsink or not.
Probably an old computer CPU heatsink is more than enough, specialy if the fan is used too.


BTW, if You -in the mean time- go near a computer store, You should go and grab some thermal transfer compund. The stuff used between chips and heatsinks.
No need for fancy stuff, the cheapest is more than good enough.
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Old 23rd July 2012, 08:27 AM   #29
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^ I would not use a fan. Wouldn't really want to listen to it whirling away in the background while also trying to listen to music.

A
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Old 23rd July 2012, 12:49 PM   #30
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handfull of diodes.
drop the voltage so the fan spins slow.
no annoying noise.

or as a side project make one that does pwm controll depending on actualy heatsink temp.

there are larger, 12 cm compőuter fans that run extreemly quiet even at 10 vdc.
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