TDA2030 Amp (Especially "Clean")

Tube or solid-state, this section goes to eleven!
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mecmast
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Post by mecmast »

Hi all,

I've been searching about this tda2030 clean amp project for a couple days. But the internet is a real mess. So couldn't find a good one to build.

First attempt was the one at GGG:

http://www.generalguitargadgets.com/eff ... a2030-amp/

But i don't have the 18v bipolar PS and couldnt understand the "-9v" thing.

Also i want to add a mini 3 band EQ (Bass,Mid,Treb)

Second attempt was this one:

http://www.paulinthelab.com/2012/05/tda ... board.html

But no EQ on this one too.

I've found several ones with "mpf102" included but i have none.

I really need help with building an amp. with 3 band EQ and the "-9v" thing.

Also another question about bipolar PS: Shall i daisy chain (+9v) and (-9v) ?

Thanks.

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The G
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Post by The G »

Actually, internet is better than always. But the search engines' answers are only as good as your questions. It really helps to know more about whatever you're searcing for.

18V bipolar means three wires from the power supply to the amplifier: one with +9V, one with 0V (or ground) and one with -9V. You could take two 9V power supplies and connect the ground wire from one to the +9V wire from the second (I think that's what you meant by "daisy-chaining"). Of course, you should not supply anything else from them.

An amp is usually made of several blocks: power supply, preamp, power amp. You want a preamp with EQ. It can be just a Marshall type passive EQ (not my first choice) sandwiched between two op amp followers or the Phabb Tone or an EQ pedal or... you got the point.
It would be easier to make a datasheet amp and just add the preamp of your choice in front of it.

If you really what to know more, then download the Holy Bible itself: Solid-state Guitar Amplifiers [by Teemu Kyttala, 2008].

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mecmast
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Post by mecmast »

I've downloaded the bible. Hope it works :)

Also i have really serious problems with power supplies. I'll dig into it too.

EQ section is not really necessary when i look at big picture.

First of all i have to build a clean preamp with TD2030.

That's all what i've understood from your reply.

Now i'm looking for the best schem for TDA2030.

I'm gonna use an 8" 8 Ohms 30w speaker for this preamp.

God help me please. :horsey:

Thanks for your reply, :)

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The G
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Post by The G »

Use a notebook power supply - it's cheap, efficient and safe (emphasizing on safe). Messing with electrical power network can be lethal and in your circuit brings no benefit.

Your best bet is the datasheet schematic and PCB - it's double tested by the manufacturer. Don't slip on the audiophyle slope.

Datasheet: TDA2030, TDA2040, TDA2050. To be on the safe side, use the datasheet from the manufacturer of your chips.

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Post by grrrunge »

Look at this one too. The drive circuit has room for improvements, but the clean sound is pretty good :)
viewtopic.php?f=2&t=13228#p147862
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mecmast
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Post by mecmast »

OMG! :applause: This is great thank you :)

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Post by Jarno »

You might want to build everything on a single pcb, but if not, you can buy tda2030 power amps on eBay. A complete module, just add a preamp. Tiny pcb, i have one in the bin somewhere to try out sometime. I think i paid 4-5usd incl shipping.
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