Electronics > Beginners

First Circuit - TDA1517P

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Audioguru:
The NXP datasheet is missing many details so it is almost useless.
You have the IC that has a package (P) with poor cooling. The cooling is much worse on your Mickey Mouse solderless breadboard.
The maximum allowed chip temperature is 150 degrees C. The ambient temperature might be 30 degrees C. 1W of electrical heating produces 15 degrees C.
Then the chip will be at its maximum allowed temperature when the electrical heating is (150 - 30=) 60 degrees C. 60 degrees/15 degrees per watt= 4W. The TI graph of heating vs output power shows a maximum heating of 2.3W per channel for a total maximum heating of 4.6W when the supply is 12V. Then it overheats.

You know what? The maximum idle current is 80mA which produces heating that is almost 1W. Then the maximum power before a meltdown is about 1.5W per channel. The larger packages have a cooling "fin" that can be bolted to a heatsink for much better cooling then the output power can be 5W per channel.

alsetalokin4017:
Put the speakers into some kind of enclosures. Even little cardboard boxes will improve the sound and the volume quite a bit. Peanut cans, chow mein noodle cans... anything that will give the cones a little back pressure and some resonant cavity. You'll be amazed.


vidarr:

--- Quote from: Audioguru on October 18, 2018, 01:29:06 am ---The NXP datasheet is missing many details so it is almost useless.
--- End quote ---

Yeah, all it did was show the schematic on a sample circuit, with some power values to make it work and stuff about the chip. But, it is all I could find.


--- Quote from: Audioguru on October 18, 2018, 01:29:06 am ---You have the IC that has a package (P) with poor cooling. The cooling is much worse on your Mickey Mouse solderless breadboard.
--- End quote ---

First of all, I do not have the "Mickey Mouse" solderless breadboard. I have the "Phantom Blot" solderless breadboard (see pic). Mickey Mouse is for kids.


--- Quote from: Audioguru on October 18, 2018, 01:29:06 am ---The maximum allowed chip temperature is 150 degrees C. The ambient temperature might be 30 degrees C. 1W of electrical heating produces 15 degrees C.
Then the chip will be at its maximum allowed temperature when the electrical heating is (150 - 30=) 60 degrees C. 60 degrees/15 degrees per watt= 4W. The TI graph of heating vs output power shows a maximum heating of 2.3W per channel for a total maximum heating of 4.6W when the supply is 12V. Then it overheats.
--- End quote ---

My computer is liquid cooled. I built it all by myself (see pic). That may be a bit much for a chip like this -- as overwhelming as its power is. But, I have a lot of heat sink options (see pics). I think the laptop, cpu/gpu fan could be pretty cool -- especially if I do what mariush suggested and run two chips. That would be really cool.


--- Quote from: Audioguru on October 18, 2018, 01:29:06 am ---You know what?
--- End quote ---

No, I do not. What?


--- Quote from: Audioguru on October 18, 2018, 01:29:06 am ---The maximum idle current is 80mA which produces heating that is almost 1W. Then the maximum power before a meltdown is about 1.5W per channel. The larger packages have a cooling "fin" that can be bolted to a heatsink for much better cooling then the output power can be 5W per channel.

--- End quote ---

Yes, I saw that. Unfortunately, when I was picking through the garbage, I only saw this one. It is very hot where I live too. Ambient temperature is about 32C right now (not in the sun). I should be fine with the cooling options in the pic. I would hate to have to throw this chip away -- again. LOL.

Speaking of heat and boards... I am going surfing. It is an awesome day today. Do you know girls wear g-strings for bikinis here. It is crazy. Naked butts everywhere.


vidarr:

--- Quote from: alsetalokin4017 on October 18, 2018, 02:10:28 am ---Put the speakers into some kind of enclosures. Even little cardboard boxes will improve the sound and the volume quite a bit. Peanut cans, chow mein noodle cans... anything that will give the cones a little back pressure and some resonant cavity. You'll be amazed.

--- End quote ---

Yeah, I have some ideas but I haven't built anything complete yet, still just partial builds using the wood I mentioned. Trying to find the right design. Fiddled around with transmission lines for a little while. Kind of interesting.

The 2ohm speakers have an enclosure already. They suck, but for quick testing it is ok.

Thanks Guys! Time to surf.



edit: I researched some power transistor circuits last night. Is it right that I would need to have a separate power supply to add this to the circuit? If so, wouldn't it be better to build a separate power transistor amp that the TDA1517 chip circuit "plugs into"? Or would I provide two power supply inputs into a single circuit? I am starting to get confused again (not incredibly difficult with this stuff).

Thank you everyone! You have been incredibly helpful. I think you guys will be impressed with the final product.

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