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Old 11th March 2011, 11:05 AM   #1
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Default Simple TDA2050 mono amp for PC

Hello peeps
This is what i want to make.. My first mono amp for PC.. Im not realy new to electronics i alrdy did few DIY projects but this one will be first one based on audio
So.. I wanted to build a simple amp with TDA2050
I have some crap trafo with 14v sec. it is around 30wats i would say...
Here is how it looks
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So idea is to make everything on one pcb board and put it inside of my pc case , also ill get one fullrange 4ohm speaker to put on one side of my pc case...
I should get from this 20-25 wats? Well power doesnt realy matter coz i want to make this for fun.. not realy for home listening or party...
So all i need is shematic for psu and tda2050 on same board including "grec" (thing that converts acv to dcv im not realy sure how to spell it on english)...
And pcb layout would be good, but i think if this stay simple as it should i can make it on raster board (board with xxxxxxx holes)
Also ill post pictures of projetc progress here so other ppls can see or even build something like this depending on their needs =)
Regards!
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Old 11th March 2011, 03:48 PM   #2
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google it.
the datasheet has everything you need.

the "grec" you refer is a diode bridge, you can purchase a 35A capable one for cheap.
No need for a raster board, nor any board at all. Point to point construction is more than suitable for this chip.
14 V single suply may be a problem.

suggestion-> car radio amp chips where ment to work between 9 and 17 volts.
Prehaps Tda1557Q or simular IC would be better suited for your task.
Simpler to build, less external components.
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Old 11th March 2011, 03:59 PM   #3
johnr66 is offline johnr66  United States
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Power output is directly related to supply voltage. Your transformer seems to have only two secondary leads, so you have to design the amp for single supply operation (output coupling cap and a voltage divider for the input bias (see datasheet)). I can't tell but the transformer appears to be in the range of 60-80va, so you get around 18 volts with diode bridge drops and some load. With a 4 ohm load, expect about 8 watts of clean power.

To use the chip to its full potential, a dual supply of +/- 20 volts will give you well over 20 watts of clean power.
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Old 12th March 2011, 01:12 AM   #4
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@Arty it is 14 ACV! So it will be around 17-18 when converted to dcv...
Yes datasheet has everything but not the board using diode bridge and i was thinging that maybe someone have it or maybe some beter version of board ...
Anyway i decied to make raster board with single supply circuit.. ill add single diode bridge without any tweeks from trafo to amp...
@Johnr66
I think transformer is not that good as u think it is It weights only 600 grams... so i think it is max 50 wats or even less.. anyway it should be fine for this mini amp...
And btw dont u think i can get more power from this ? I mean data sheet says that i can get 28 wats on 4 ohm load with psu of 18v
Or that is only for split supply?
Regards!
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Old 12th March 2011, 01:55 AM   #5
johnr66 is offline johnr66  United States
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Quote:
Originally Posted by ToMiC View Post
@Johnr66
I think transformer is not that good as u think it is It weights only 600 grams... so i think it is max 50 wats or even less.. anyway it should be fine for this mini amp...
And btw dont u think i can get more power from this ? I mean data sheet says that i can get 28 wats on 4 ohm load with psu of 18v
Or that is only for split supply?
Regards!
50 watts is still more than enough for your application. Heck, in a PC, I'd just ditch that thing and bridge two 2050s off one of the PSU's 12 volt rails. In this case you could use that car amp chip.

The datasheet probably says +/- 18 volts meaning a split supply with 36 volts from positive rail to negative rail.
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Old 12th March 2011, 10:32 AM   #6
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Hmm... Well if i bridge 2 chips i cant use 4 ohm fullrange speaker for car... Well thats not realy problem i can get 8 ohm mid-bass speaker + small tweeter in side of my computer case.. thats not problem it is realy cheap... Can u suggest me what chip will give most power on 18vdc? (in bridged version)
Consider that sound quality isnt realy matter , afterall this is just project for fun...
As long it is simple , im willing to build it...
Thanks john!
Regards!
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Old 12th March 2011, 11:51 PM   #7
johnr66 is offline johnr66  United States
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Quote:
Originally Posted by ToMiC View Post
Hmm... Well if i bridge 2 chips i cant use 4 ohm fullrange speaker for car... Well thats not realy problem i can get 8 ohm mid-bass speaker + small tweeter in side of my computer case.. thats not problem it is realy cheap... Can u suggest me what chip will give most power on 18vdc? (in bridged version)
Consider that sound quality isnt realy matter , afterall this is just project for fun...
As long it is simple , im willing to build it...
Thanks john!
Regards!
On second though, a lot of power on the speaker will cause vibrations on a computer case and sound like crap. It will also vibrate your hard drive and other components, I'd rethink this setup if I were you.
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Old 13th March 2011, 12:58 AM   #8
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NTX on Perplex with neon light t
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Old 13th March 2011, 03:51 AM   #9
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@John
I know that... Those speaker vibrations may be awful .. and i know it can damage my HDD... But as i say i wont use this for home listening or party, i just want to have it in side of my pc , just in case if something goes wrong with my home hi fi system..
After all im willing to do this for fun , and ofc to learn something from this project
So plz would u be polite and suggest me best(strongest) chip for single 18vdc supply?
I wish i had more experience with TDA,LM and chips like these... Otherwise i wouldnt chase u to help me and suggest me about this
Regards!
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Old 13th March 2011, 01:38 PM   #10
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Quote:
Originally Posted by ToMiC View Post
@Arty it is 14 ACV! So it will be around 17-18 when converted to dcv...
Yes datasheet has everything but not the board using diode bridge and i was thinging that maybe someone have it or maybe some beter version of board ...
Regards!
yes it is 17-18 volts. a diode or 2 in series with the amp will make sure it ain't too mutch for the mentioned tda1557q chip.
And it is a bridged car amp chip, just what you need.

the diode bridge it self is sold in a package, that has 4 leads.
Sortha like this:
Click the image to open in full size.

adding a capacitor say.. 6800 uf /25 V paralell with 15pf ceramic should be more than okay for your project, be it made with the tda2050, or the tda 1557q.

I would still choose 1557q for its simplicity (or any of its close relatives).

the power you can expect considering the supply voltage is not that great, at least it looks like it. But 8-10 watts can be louder than you ever need.
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