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Old 28th January 2013, 09:43 AM   #1
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Default help to power my diy amp kit

hello i just bought this kit and i am finished soldering it. now i want to try it but i dont have any transformer and i don't know witch one to use.

it says Power Input:2 X 12VAC

can i build it myself? i have magnet wire from a scrapped tv.

i have not found any tutorial for this.

if it is impossible to build myself i want to know what transformer i can buy that will fit this kit.

link to the amp kit:
TDA2030A Audio Power Amplifier DIY Kit Components OCL 18W x 2 BTL 36W | eBay


thank you
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Old 28th January 2013, 10:25 AM   #2
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Not impossible, just not practical. You should look to buy a 24-volt center-tapped (24VCT) transformer, rated for 4 amps.
You'll also need a line cord, fuse and holder, connecting wire, and a constant remembrance that you will be dealing with mains voltages. Safety has priority. Use this thread any time you are uncertain of how things should be put together.
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Old 28th January 2013, 10:55 AM   #3
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Or in other words you need a 12V x 2 (12v - 0 -12v) transformer rated at 100VA

Something like this one will do very nicely.
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Old 28th January 2013, 12:31 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

50VA would be plenty big enough, 100VA is overkill.
Stating the obvious : you'll also need a heatsink.

rgds, sreten.
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Last edited by sreten; 28th January 2013 at 12:33 PM.
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Old 29th January 2013, 04:46 AM   #5
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Quote:
50VA would be plenty big enough, 100VA is overkill.
After roughly derating a 2A transformer for the on-board DC supply, I decided a few $$ more for a bigger transformer would be worth it. The best value in the 50-100 VA range would be the smartest shopping IMO.
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Old 29th January 2013, 11:00 AM   #6
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ok thanks for very good and fast replies=)
and thanks for letting me join this amazing forum.

I upload a picture of the heatsinks.
The smaller black one i plan to use for both the TDA2030A.
The big heatsink for the transformer?
i get them from a scrapped computer.

so if i get it correctly then this transformer will work for my kit?
Toroidal 230V Mains Transformer 50VA 0 12V 0 12V | eBay

it is more in my price range. this is going to be my first amp build so i dont want to spent too much on just learning the basics.

i know im dealing with 230v ac here so im planning for saftey first!
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Old 29th January 2013, 12:25 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

The transformer doesn't need a heat sink.
The 50VA will be fine, its on the generous side of what is needed.

rgds, sreten.
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Old 29th January 2013, 01:08 PM   #8
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Ok thank you. And i also wonder what amp value on the fuse? I plan to make a wood box with inbuilt speakers. Maybe car speakers. I can upload progress
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Old 8th February 2013, 12:31 AM   #9
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Hello i am back again
I wonder now how to connect this.
I need help to wire up my diagram so that i can start doing some testings.
will the speakers for my project work? can i have four speakers?
I also need to know how to wire the fuse holder and on off switch to the torodial transformer.

thank you for your help
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Old 8th February 2013, 03:28 PM   #10
johnr66 is offline johnr66  United States
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Sreten is right. I use a Radio Shack 12.6-0-12.6, 2A tx to power one of my TDA2050 stereo amps. Max non clipped sine wave power, both channels driven is 10w at 8 ohms and 15w into 4 ohms. Driving only one channel, I can get 18w into 4 ohms. So doubling up on the supply, each channel getting its own 50va supply, I only get 3 watts more per channel - an inaudible difference.

For comparison, I have a 28v ct 100va transformer and get 14w at 8 ohms and 22w at 4 ohms with the same amplifier. I wouldn't power a TDA2030A with this because peak current is 3.5a vs. 5 for the 2050, so a 24v ct 50va transformer will do the job and is cost effective.
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