Hi everyone,
I'm trying to searching for an amplifier than can work well with low power supply like 15V dual rail or single rail and expected to able to output about 10~15W to 4ohm speaker with signal from my laptop.
Since i dont have any audio mosfet (which is hard to obtain in VietNam) so i hope it will use common BJT.
Thank you very muchh.
I'm trying to searching for an amplifier than can work well with low power supply like 15V dual rail or single rail and expected to able to output about 10~15W to 4ohm speaker with signal from my laptop.
Since i dont have any audio mosfet (which is hard to obtain in VietNam) so i hope it will use common BJT.
Thank you very muchh.
Are you wanting to go Class-D, or linear? Tons of Class-D amps will fit that bill and offer much higher power levels but you won't be able to build one yourself easily, so I assume you want to go linear. For that high power level you will have to look for a Bridge Tied Load (BTL) type amplifier. A standard single class-AB amp will be limited about half of that power or less (if you are limited to single rail supply of 15V).
A BTL amplifier uses two amplifier channels, of opposite phase, and the speaker is "bridge tied" between the two outputs, so it doubles your output voltage and quadruples your output power. You can find many different inexpensive BTL amplifier chips, or design your own using standard amplifiers, and use op-amp circuits to provide opposite phase signal to drive them with.
If you can use +/- 15V, achieving 10-15W is no problem. You just need to decide which parts you can get and what style of amplifier circuit you want to build.
A BTL amplifier uses two amplifier channels, of opposite phase, and the speaker is "bridge tied" between the two outputs, so it doubles your output voltage and quadruples your output power. You can find many different inexpensive BTL amplifier chips, or design your own using standard amplifiers, and use op-amp circuits to provide opposite phase signal to drive them with.
If you can use +/- 15V, achieving 10-15W is no problem. You just need to decide which parts you can get and what style of amplifier circuit you want to build.
For such low voltage I wouldn’t even bother with discrete amps but,
You have many chip amplifier options, lm1875, tda2040/50, lm3886, tda7293/4 etc
You have many chip amplifier options, lm1875, tda2040/50, lm3886, tda7293/4 etc
If you are not going to build this amp for learning purposes using discrete transistors then the best advice is to go with the chip amp route. Both LM1875 and TDA2050 are gives around 15 watts to 4 ohm load at +/- 15V or single 30V supply. Choose whichever is available to you easily at your local market.
TDA2030 is good enough and parts from STMicro are still sold to this day, TDA2040 is also good for the usage but it was obsoleted
before the 2030, so dunno if there s still available parts from STMicro, max supply voltage is +-18V (36V single rail) for the TDA2030 and +-22V for the TDA2040 (44V single rail).
before the 2030, so dunno if there s still available parts from STMicro, max supply voltage is +-18V (36V single rail) for the TDA2030 and +-22V for the TDA2040 (44V single rail).
If you’re looking for a chip amp, look at all the great suggestions you’re getting above.
If want to build something discrete from scratch that’s good enough to amplify computer audio, just build one of the countless blameless-style designs. I have one that’s powering my office speakers if you’re interested. Nothing fancy, but more than good enough for computer audio.
If want to build something discrete from scratch that’s good enough to amplify computer audio, just build one of the countless blameless-style designs. I have one that’s powering my office speakers if you’re interested. Nothing fancy, but more than good enough for computer audio.
You have LCSC in Hongkong.
They have a good sortiment and are cheap-
I would not use the old TDA 20xx types because their distortion is clear to hear.
Personally i have an amplifier with 2x17v and expensive desktop speakers at my computer.
It is the place where the music goes 6 hours a day.
Tell us a little more of you and your plans.
Are you an experienced builder or is it your first project?
Do you have multimeter, tone generator or oscilloscope?
Do you want something like 0,0000001% distortion or the simpliest build?
Can you plan a PCB or do you want a tested amplifier kit?
They have a good sortiment and are cheap-
I would not use the old TDA 20xx types because their distortion is clear to hear.
Personally i have an amplifier with 2x17v and expensive desktop speakers at my computer.
It is the place where the music goes 6 hours a day.
Tell us a little more of you and your plans.
Are you an experienced builder or is it your first project?
Do you have multimeter, tone generator or oscilloscope?
Do you want something like 0,0000001% distortion or the simpliest build?
Can you plan a PCB or do you want a tested amplifier kit?