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Old 17th July 2013, 10:11 AM   #1
Kuurna is offline Kuurna  Finland
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Default More power out of bass combo

Hi!

Can somebody please tell me, if it's possible to replace the tda2040 based power amp section with more powerful one on my small bass guitar amp?

I'm allready going to have tda7294 power amp board. Can I use that or is some other design more suitable on 50-100w power range.

Thanks, J
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Old 17th July 2013, 11:31 AM   #2
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Your limitations are power supply and speaker impedance/power handling.
If you use a TDA2050 (direct replacement but higher power) not a lot will happen if your power supply rail is not increased and/or your loudspeaker impedance is not reduced.
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Old 17th July 2013, 11:43 AM   #3
Enzo is offline Enzo  United States
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The power amp IC doesn't create power, it simply controls power passing through from the power supply. If your power supply cannot provide 100 watts, putting in a 100 watt power amp IC won't make it so. In the sense that putting racing tires on your mom's car won't all of a sudden make it go 200 miles an hour.


Are you really after increased power? Or are you hoping to make it louder? If you just want more sound, connecting the amp chassis to a larger speaker cabinet will make a large difference. If the combo is 1x10 and you connect it to a 4x10 it will sound a lot larger. Or a 1x15 or a 4x12.

Sit your amp in the middle of the room and play it. Listen to it. Now move it to a wall, and listen, then into a corner and listen. Those surfaces direct sound from the speaker and add to the loudness. Someone else just wrote that experiment yesterday, but I can't recall who, otherwise I'd give them credit.
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Old 17th July 2013, 11:46 AM   #4
JMFahey is online now JMFahey  Argentina
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As noted above, you will not increase power unless you also put a larger power supply and speaker there.

So if you will need to replace/increae:
a) power supply : transformer/caps/diodes
b) chip amp (and provide increased heat sinking for it)
c) a larger speaker, which also means a larger cabinet

then what you should *actually* do is to build an extra cabinet, fit a speaker, PSU and chipamp inside it, so you now have a Powered Cabinet, and drive it from your original amp.

It's a good solution: for bedroom practice you use the original amp, as-is, and to play along a drummer (loud guys ) you add the powered cabinet.
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Old 17th July 2013, 12:06 PM   #5
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This is a novel way of getting more power from a TDA2030
Google Image Result for http://4.bp.blogspot.com/-eROIVAIERyo/TsQMxuo3L6I/AAAAAAAAAhQ/27ApN8cOan0/s1600/170W%2BAudio%2BPower%2BAmplifier%2B%2BWith%2BLM465 1%2526LM4652.gif
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Old 17th July 2013, 12:20 PM   #6
JMFahey is online now JMFahey  Argentina
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Care to post the correct link?

No TDA2030 in the one you posted.
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Old 17th July 2013, 01:55 PM   #7
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Quote:
Originally Posted by JMFahey View Post
Care to post the correct link?

No TDA2030 in the one you posted.
There is when I click on it, it's the usual 2xTDA2030's in a bridge configuration with extra power transistors driven from their supply feeds.

Not that it helps anyway - as we all agree, you need a larger PSU and speaker as well as a bigger amp.
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Old 17th July 2013, 03:14 PM   #8
Kuurna is offline Kuurna  Finland
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Thank's for the replies guys.

A little explanation:
It's for jazz (no need for ultimate lows) and I like it small. I understand it's going to need a bigger power supply. Cabinet enclosure is about 0.5 cu ft (16 litres) and I already have 2 candidates for replacement speaker; eminence legend bp102 and 102-4 (4 & 8 ohm, 150-200w). Preamp section is decent with switchable limiter, 3-band eq, line-out and phones out. There is plenty of room at the amp "chassis".

-J-

Last edited by Kuurna; 17th July 2013 at 03:37 PM.
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Old 17th July 2013, 11:16 PM   #9
JMFahey is online now JMFahey  Argentina
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@ Nigel Goodwin:
not to hijack the thread, but I find it weird that when I click that link, I get a *very* different schematic ..... and no TDA2030 anything visible or even clickable anywhere:
Click the image to open in full size.

*Maybe* because it's google.UK and you are checking it from "inside" GB?

@kuurna (you aren't a Space Alien for which "Earth should stand still", are you?): post a couple gut pictures showing chassis and cabinet inside, *maybe" you can fit a power amp and PSU inside the *cabinet* section, leaving everything else as-is, using just the old preamp.
Driving the new 10", of course.

I suspect the limiter will stop working though.
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Old 17th July 2013, 11:24 PM   #10
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My apologies, either I or Google was confused.
Try this
Google Image Result for http://www.eleccircuit.com/wp-content/uploads/2012/08/the_otl_amplifier_listen_comfortably_by_tda2030_an d_tip41+tip42.jpg
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