Hi, if someone can recommend a stronger amp (about 100w mono) class d, but it must runs on 12-14 volts, the quality of the sound is not as important as power. currently use tda1562q and its weak for my needs (portable amplifier for bass guitar)?
Without a internal or external dc-dc converter it would be a physical impossibility for all practical impedances as Ohm's Law state that Power=Voltage^2/Impedance (P=V^2/Z). So for 100W from 12V it would take a speaker with an impedance of 1.44 ohm but these are peak power values, and what is really interesting is average power, or Pavg, sometimes mistakenly called RMS power, or Wrms. For that you simply double the impedance in the equation above, so the you get that from 12V supply to get Pavg=100W the impedance has to be 0.72 ohm.
Car amplifiers, eg. sub mono blocks, are good examples of amplifiers that simply have an internal dc-dc converter to convert the 12V battery voltage input into a more practical higher supply voltage for the internal amplifier. But you can buy such converters loose and apply to any amplifier you like that can take the required voltage, and have the required output in the required impedance.
Car amplifiers, eg. sub mono blocks, are good examples of amplifiers that simply have an internal dc-dc converter to convert the 12V battery voltage input into a more practical higher supply voltage for the internal amplifier. But you can buy such converters loose and apply to any amplifier you like that can take the required voltage, and have the required output in the required impedance.
It's a single capacitor based voltage doubler so 70W is hardly realistic. And certainly not for bass use.
i need diy kit, something like tda1562, i would use it for practise whit band( no drums), so tda1562 is enough strong for that but i want something more powerful but not that so, just 30-40 watts more
There is practically no difference between 70W and 100W, 1.55dB to be exact, or a barely noticeable change in volume.
That being said. The TDA1562 produces no where near 70W for anything other than momentary peaks of less than 4.7milliseconds. A good guess at actual output with bass guitar use would be around 20W, 30W max.
A guess considering the capacitor size of 4700µF per half bridge would equal 0.2mAs and the recharge rate of the capacitor would be roughly 10ms.
I've been trying to find a 12V poweramp solution for a boombox project I might do, and after a bunch of research I've concluded that best approach is to use car poweramps. Most poweramps are designed for "music power" type duty cycles, which means they may have thermal problems if driven fairly hard and continuously for long periods of time.
I'd get amps that put out at least twice the amount of power that I thought I wanted, and then not ever push them to their limits. I'd even consider putting a limiter circuit in the signal chain to make sure I didn't push the amps too hard. These days any "car amp" over 20watts (and probably under) is going to be class D or some variation of "switchmode" technology.
Building switchmode circuits that are reliable is very challenging. I'd research reviews of big name companies (Pioneer? Kenwood? etc.), and then choose one. It might even be fun to have a car receiver (rather than just a poweramp) that has an AUX input that you could plug your bass into, but AUX in won't give you enough gain, so you add an opamp gain circuit and a 1/4 inch input jack. Then when you want to take a break from playing, you've got a Radio/CD player/USB/SD chip port available. Many car receivers even have remote controls these days.
I'd get amps that put out at least twice the amount of power that I thought I wanted, and then not ever push them to their limits. I'd even consider putting a limiter circuit in the signal chain to make sure I didn't push the amps too hard. These days any "car amp" over 20watts (and probably under) is going to be class D or some variation of "switchmode" technology.
Building switchmode circuits that are reliable is very challenging. I'd research reviews of big name companies (Pioneer? Kenwood? etc.), and then choose one. It might even be fun to have a car receiver (rather than just a poweramp) that has an AUX input that you could plug your bass into, but AUX in won't give you enough gain, so you add an opamp gain circuit and a 1/4 inch input jack. Then when you want to take a break from playing, you've got a Radio/CD player/USB/SD chip port available. Many car receivers even have remote controls these days.
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