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Old 12th April 2011, 12:19 AM   #1
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Default My first real project

Hello everyone this is my first post on this board. I am a junior studying electrical engineering and now we are starting to get assigned projects to start building. I am in the EE lab course but we only deal with simple circuits and low power supply. My first project that I will be building is an audio power amplifier using a TDA2030 IC. My question is can I use a laptop transformer as my power supply? The transformer out puts 18v at 3 amps. This is not going to be the permanent power supply but I want to use it just to demonstrate the circuit to my class. I don't want to spend too much time building a power circuit because I want to spend most of my time analyzing the amplifier circuit and I'm not familiar with power circuits yet.

These are the two circuits that I was looking forward to building. Which one seems like a better candidate?

TDA2030 bridged 35w amp:

TDA2030 amplifier schematic

TDA2030 single chip 40watt amp:

40 Watt Power Amplifier Circuit With TDA2030 – Free Electronic Circuit Schematics
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Old 12th April 2011, 01:04 AM   #2
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I found a bridged amplifier from the spec sheet. Since I do not know who designed the other circuits this is the one I'm leaning towards. I am ordering my parts from mouser and will be purchasing a couple of other chips for future projects. So far I am going to order a few TDA2030 TDA2050 and TDA2003 IC's. I am really into audio amps and was wondering if anyone has any suggestion of car audio IC's that would make a good side project to work on. Also I posted that I don't want to really build a power circuit but after reading some more seems like I just might have to. I just don't like messing with things that can be potentially dangerous until I fully understand them. But I will take extra caution building this transformer. I found some transformers on mouser but dont know which one is suitable.

Transformers:

Transformers

Figure 16--Bridged amp

http://www.st.com/stonline/books/pdf/docs/1459.pdf

Last edited by pimster987; 12th April 2011 at 01:22 AM.
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Old 12th April 2011, 06:55 AM   #3
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Go with single TDA , if you want more power go with TDA 2050 ,it is same thing with more power.
You cant use laptop psu !!!
To drive TDA 20xx series you need a simetrical votage supply,like 2 x 15 volts.I mean you need a +15v and -15v to drive amps.
Laptop psu have omly +18v.
Generaly you need common usage transformer with 2 output woltage betwen 14-18v (2 x 14-18v) with 50 to 70 watts (total).
One rectifier bridge (40v ;4 or 6A),2 x 3300mf or 4400mf 35v capacitors
for basic power supply a both TDA's (stereo).
TDA 2030 real power is 10-12 watt at 4ohm its sound very good.
Dont bother with power rating of any amps,go for how its sounds !!
TDA is a good for start...
Attached Images
File Type: png TDA2050-Chipamp-Power-Supply-Schematic.png (18.1 KB, 246 views)
File Type: png TDA2050-Typical-Application-Circuit-Schematic.png (67.7 KB, 246 views)
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Old 12th April 2011, 07:13 AM   #4
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Quote:
I am really into audio amps and was wondering if anyone has any suggestion of car audio IC's that would make a good side project to work on
TDA 7394
It's stereo
It's BTL
Works with a single supply
Sounds good
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Old 12th April 2011, 07:46 AM   #5
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I think he looks for kit amp (with all parts in plastic bag).
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Old 12th April 2011, 08:33 AM   #6
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Well... I didn't find it in a kit ....it was in the middle of a Tv PCB and all I had to do was to cut the square containing the circuit and put it in a box
with a 20V trasformer ( unloaded ), a diode bridge and a pair of 2200 uF capacitors .
It has enough punch and it drives low loads.
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Old 12th April 2011, 09:10 AM   #7
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Yes it's simple for you,but he is beginer,I dont think that he hade skils in choping a electronics parts from old equipment.
sory for my bad engl.
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Old 12th April 2011, 12:48 PM   #8
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Simple route, build a cmoy to aquaint yourself with split supplies connecting volume controls etc, without danger of blowing up parts or harming yourself, this should take no more than an evening. Then move on to something more complex.
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Old 12th April 2011, 04:54 PM   #9
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Quote:
Originally Posted by Dragance View Post
I think he looks for kit amp (with all parts in plastic bag).

No I am not looking for kit amps and yes I am just a beginner but I am trying to learn how to build different audio amps. I don't want an amp that is to easy to build because there will be no way to physically see whats changing inside the IC and I want to know how the signal is changing. I have access to lab equipment and I want actually understand whats going on at different stages of the circuit. I am starting off with IC's because there is less hassle and I have a time constraint since its a school project. But eventually I would like to build a simple low power amp with single transistors and thoroughly analyze the circuit. I am doing all the audio stuff as a hobby aside from my school work. We really haven't touched on high power amps yet just small signals and I would like to know more about power amps. Thanks for all the information. Also I realized last night after I cut the tip off the laptop transformer that it was 18VDC since there was only one thick wind of wires.

Last edited by pimster987; 12th April 2011 at 05:08 PM.
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Old 12th April 2011, 06:54 PM   #10
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I wouldn't trust too much in electronic PSUs for audio amplifiers .
They're too much complicated and the simpleness of a bobbin as in a transformers is great . Another matter is pro audio ,where low weight & high power make the difference -check out the latest PFC circuitry adopted -
If the thread started from ICs and it's moving to discretes , I would be happy !
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