TDA2030 Stripboard Layout

davidallancole · 17th March 2009, 02:57 AM

Hi All,

I have created a layout for a TDA2030 amplifier on a piece of stripboard. I was wondering if you all could take a look at it and see if there should be any changes made to it. It is the basic test setup shown in the datasheet.

http://home.planet.nl/~midde639/specs/tda2030.pdf

I have made a few assumptions with this that I will share with you:

1. The input is coming from a potentiometer setup as volume control
2. The output is going to a 1/4" jack for a guitar cabinet. The output zobel will be soldered to the 1/4" jack
3. C1 and C2 will probably take up more room then what is shown, but as I don't have the parts in front of me, I am not sure how much room they will take
4. I am aiming for +-18VDC supplies with an input signal of ~1.4V
5. R3, R2 and C4 form the feedback network

Anyways, what do you think?

pacificblue · 17th March 2009, 08:03 AM

The Zobel network should be next to the IC.

Are you going to solder the 100 nF decoupling caps directly to the IC pins?

If you connect a guitar with an active pick-up, there could appear DC at the input. You should therefore use a DC blocking cap at the non-inverting input. That would mean to add C1 and R3 as per test circuit.

C4 is very small. The lowest note of an electric guitar is around 80 Hz, if I remember correctly. The corner frequency of that high-pass should be below a fifth of that frequency, i. e. the capacitor should be greater than or equal to 10 µF. Even bigger, if you use a DC blocking cap.

Does your guitar have enough output for a gain of only 10?

Elektor78 · 17th March 2009, 05:42 PM

TDA2030 (+/- 18VM, 14W)
TDA2030A (+/- 22VM, 18W)
TDA2040 (20W)
TDA2050 (32W)
All in pentawatt package..

davidallancole · 17th March 2009, 06:02 PM

Thanks for the replys.

I will add the zobel on to the drawing after work. I was wondering about where I should put the decoupling caps. I will try to get them close to the chip. I will change C4 to 10uF as well.

I will be using a pre-amp with this and am expecting ~1.4V peak signal out of it. With a gain of 10, that should bring it up to 14V peak which I think will be good since I plan on using ~+-18VDC for the power supply.

I will be using a tone stack (Fender/Marshall style) near to the end of the pre-amp which will eliminating any dc offset so I planned on just connecting the volume pot directly into the non inverting input.

davidallancole · 17th March 2009, 06:30 PM

Here is a remade layout.

davidallancole · 17th March 2009, 06:31 PM

And another. Does one look better than the other? They both use the same component values.

pacificblue · 17th March 2009, 07:30 PM

You will need space for the heatsink. How about soldering the decoupling caps directly to the IC pins from below the PCB?

The feedback resistor should be as close as possible to the IC, which makes the second layout more promising (in theory).

davidallancole · 18th March 2009, 04:44 AM

Here is the latest revision. I have the feedback resistor near the output pin, the zobel is onboard and the 100n caps would be soldered to the pins of the chip under the board and ran back to the power ground.

pacificblue · 18th March 2009, 05:16 AM

Probably as good as it can get on stripboard.

davidallancole · 18th March 2009, 01:37 PM

Thanks for your help pacificblue.

17th March 2009, 08:03 AM	#2
pacificblue diyAudio Member Join Date: May 2008	The Zobel network should be next to the IC. Are you going to solder the 100 nF decoupling caps directly to the IC pins? If you connect a guitar with an active pick-up, there could appear DC at the input. You should therefore use a DC blocking cap at the non-inverting input. That would mean to add C1 and R3 as per test circuit. C4 is very small. The lowest note of an electric guitar is around 80 Hz, if I remember correctly. The corner frequency of that high-pass should be below a fifth of that frequency, i. e. the capacitor should be greater than or equal to 10 µF. Even bigger, if you use a DC blocking cap. Does your guitar have enough output for a gain of only 10? __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

17th March 2009, 07:30 PM	#7
pacificblue diyAudio Member Join Date: May 2008	You will need space for the heatsink. How about soldering the decoupling caps directly to the IC pins from below the PCB? The feedback resistor should be as close as possible to the IC, which makes the second layout more promising (in theory). __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

18th March 2009, 05:16 AM	#9
pacificblue diyAudio Member Join Date: May 2008	Probably as good as it can get on stripboard. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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17th March 2009, 05:42 PM	#3
Elektor78 diyAudio Member Join Date: Jul 2008	TDA2030 (+/- 18VM, 14W) TDA2030A (+/- 22VM, 18W) TDA2040 (20W) TDA2050 (32W) All in pentawatt package..

17th March 2009, 06:02 PM	#4
davidallancole diyAudio Member Join Date: Nov 2005	Thanks for the replys. I will add the zobel on to the drawing after work. I was wondering about where I should put the decoupling caps. I will try to get them close to the chip. I will change C4 to 10uF as well. I will be using a pre-amp with this and am expecting ~1.4V peak signal out of it. With a gain of 10, that should bring it up to 14V peak which I think will be good since I plan on using ~+-18VDC for the power supply. I will be using a tone stack (Fender/Marshall style) near to the end of the pre-amp which will eliminating any dc offset so I planned on just connecting the volume pot directly into the non inverting input.

18th March 2009, 01:37 PM	#10
davidallancole diyAudio Member Join Date: Nov 2005	Thanks for your help pacificblue.

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