Author Topic: Could this work?  (Read 2266 times)


  • Chipper
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Could this work?
« on: April 19, 2012, 02:49:04 AM »
I want to build a small amp for my brother. I made this diagram using a TDA2030, my problem is my design requires a bi-polar power supply to power my TDA2030, since I only have a 220v-12v transformer would my design work, I also intend on adding a 9V PS to power my pre-amp.  if this design works, what are the disadvantages of such design. Thank you  :tu:

J M Fahey

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Re: Could this work?
« Reply #1 on: April 19, 2012, 06:57:43 AM »
Use TDA2003 / TDA2002 / LM383 which is the single supply version.
They suggest a PCB layout.
You'll also need your 12VAC transformer, 4 1N4002 diodes (or a bridge, such as WN002) and a 2200/4700uFx25V main capacitor.
This will supply around 16VDC which is perfect.
The amp will drive 2 ohm loads, so you can use 2 4 ohm speakers if you wish. Or just use 4 ohms ... or just 8 if it's all you have.
Plenty of power anyway for a home amp.
Post what preamp you intend to use, probably you will need only a 9V zener, a resistor and a 100uF capacitor.
Or if you want the 9V regulator, go for it, but after it use a 10uF maximum capacitoe; a large 1000 or 2200 uF one will kill it quickly.

You can get the TDA2003 for sure; if not keep searching.
Avoid NTE parts and EBay oriental suppliers.


  • Chipper
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Re: Could this work?
« Reply #2 on: April 19, 2012, 07:53:03 PM »
Thank you for clarifying, I haven't decided which pre-amp to use, I have 4558, TL072 and some transistor design. After building the power amp I'll just mix and match what sound my brother wants.


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