TDA2006 higher wattage replacements?

[jrc4558]

What would those be? I mean with the same pin configurations. So far I found only TDA2030. Need your advice!

[Paul Perry (Frostwave)]

From my data book, TDA2030A (+-6 to +-22 supply, 20W dissapation) and TDA2040 (=-2.5 to +-20 supply, 25W dissapation, special thermal shutdown) are OK. ***BUT NOT TDA2042A, that is completely different.
Sorry, that is all I could find.

[Arn C.]

TDA2030=14W
TDA2040=22W=NTE1376
LM1875T=20W

I have an extra LM1875T if you need one!

Peace!
Arn C.

[jrc4558]

Cool!!! Now let's see if that power transformer can handle their current draw!
I'm just modding a little solid state amp to power up the talk box, hehe. Might come out really nice!

[Johan]

I really like the LM1875...with enough vooltage it can actually produce up to 30watts into 8ohm..but i the drawback is that it disapates around 6watts of heat at idle, so you need a pretty good heatsink..
it also has a bigbrother in the dual version LM1876, for stereo or bridgemode....

johan

[fretzburner]

I really like the LM1875...with enough vooltage it can actually produce up to 30watts into 8ohm..but i the drawback is that it disapates around 6watts of heat at idle, so you need a pretty good heatsink..
it also has a bigbrother in the dual version LM1876, for stereo or bridgemode....

johan

I am planning to build LM1875 power amp using godlyke powerall 9v 2A supply and use max1044 to split it to +-9v.Is this applicable?I cannot use PT because of it's size(will not fit inside my enclosure).

[R.G.]

One of the things I'm sure that people get tired of me saying is that the actual power amplifier circuit is only a wart on the power supply. If the power supply won't give you enough power to run it, no power amp circuit can put it into the speaker.

In your case, you're likely to run into some issues. The MAX1044 can't produce a whole lot of current. The application notes tell you to assume that the voltage will sag as though it's coming through an 80 ohm resistor. With one 9V supply and one -9V supply through a (virtual) 80 ohm resistor, it will be hard for the LM1875 to run right at more than very small power levels. There are schemes to use many voltage converter chips in parallel to get around the current limitation, but this gets complicated fast.

One thing that might help - use a second 9V adapter to make the -9V. One makes +9, the other -9, and you can pull a (relatively) lot of current out of them.

[PRR]

> max1044 to split it to +-9v.Is this applicable?

I too am tired of R.G. having to explain basic things.

There's a better way.

If you have a small single supply, use a Car Sound amplifier chip. They will make a lot of power on a single 12V supply. They won't be bad on a single 9V supply.

AND you don't need a large output cap. (You do need an UN-grounded output jack.)

The TDA7240 such as used in Taylor's Tiny Giant amp is a fine choice.

[fretzburner]

Thanks R.G. and PRR
I guess i will drop my max1044 idea then and i will use my 12v dc 2A adaptor for this project.Please share some circuits how to generate +/-12v from a single 12v dc supply.Will still use LM1875 because it's the one used in Marshall 20w schem that i'm following.

[anchovie]

Thanks R.G. and PRR
I guess i will drop my max1044 idea then and i will use my 12v dc 2A adaptor for this project.Please share some circuits how to generate +/-12v from a single 12v dc supply.Will still use LM1875 because it's the one used in Marshall 20w schem that i'm following.

If it was easy to generate -12V from +12V to run a power amp, amp manufacturers wouldn't use bipolar transformers.

If you're copying a Marshall schem, you'll need a transformer of the same spec that Marshall used. If you want to use a 12V 2A PSU, find a chip that will run on a single supply. And, to reiterate yet again what R.G. said, make sure from the datasheet that the current the PSU supplies will be enough. 24W in doesn't mean it's enough for 20W out - there'll be power lost as heat as well.

[fretzburner]

Yes there's some compromise here because i'm using this power amp inside my effect pedal enclosure that's why transformer is out of the plan.I'm building something like ethos amp.

[R.G.]

On the other hand, there are some very small, flat transformers. You can get a 10-15W toroid that's about 2.5" diameter and 1.5" tall. Two of these would give you +/- voltages to power a 15-20W rated amplifier and would fit under most pedalboard surfaces.