I just finished my CarPC project and and I am stuck on the Audio side of it....My PCs audio jack is not powerfull enough to provide enough sound to the CAR speakers. So what I figured is that I need amplification. 🙂 Ok until here...now I understand that Car Hifi systems have integrated 4x40 WATT or 4x45 WATT amplifiers. They must of course be on a PCB and quite small to fit in the 1 DIN system. Since I want to make my project as small as possible (already made my PC 1-DIN) I am looking for a schematic or somewhere to buy a 4x45 WATT AMP PCB. I am a newbie when it comes to such audio PCB things and I was wondering if any of you guys could help me...Any information would be greatly apreciated. I am not looking for someone to give me the solution to my problem, even though this would be super...however any information of where to look for and what exactly the name of such an amp is...is this a chip amp? or is there another word for this kind of amps?
Thank you in advance and I hope I didnt bother you with my questions...
Regards
Thank you in advance and I hope I didnt bother you with my questions...
Regards
You can buy the modules rather cheap at www.conrad.de. They are probably also in Greece.
Note that 4*45 Watts is at 14.4 Volts, music power not RMS and with 10% distortion.
4*15-20 watt RMS with 12,5 Volt supply and 1% distortion is a more usefull figure.
Note that 4*45 Watts is at 14.4 Volts, music power not RMS and with 10% distortion.
4*15-20 watt RMS with 12,5 Volt supply and 1% distortion is a more usefull figure.
The amplifiers built into a head unit (the 4x 45 "watt" ones) are typically only good for 10 to 15 watts RMS into a 4 ohm load. Most car speakers are 4 ohms as compared to 8 ohms for home speakers. This is because a 4 ohm speaker cna make twice the power of a 8 ohm speaker with the same voltage. THe amplifiers built into car stereos do not have their own powersupply, and they are limited to the 14 volts or so provided by the battery (seperate car amplifiers have their own power supplies that step up the voltage to allow them to put out more power). The amplifiers in a car head unit are typically run in a rbidges mode, this allows them to create more power with a given input voltage. the trade off is that both speaker + and - are floating at half the supply voltage (6 or 7 volts), and you will blow out the amp if you ground either wire (DO NOT GROUND THE SPEAKER NEGATIVE, it isn't grounded! this will blow the amp!)
Typically car head units use a single large power op-amp IC that simply takes power input, a few control signlas, 4 line level inputs, and then has pins for the speaker outputs. the chip does the rest! I assume that you can buy a kit with one of these already on a circuit board from somewhere. But I have also seen some kits with a few TDA2030 amplifier ICs. I think Veleman made them.
Typically car head units use a single large power op-amp IC that simply takes power input, a few control signlas, 4 line level inputs, and then has pins for the speaker outputs. the chip does the rest! I assume that you can buy a kit with one of these already on a circuit board from somewhere. But I have also seen some kits with a few TDA2030 amplifier ICs. I think Veleman made them.
Can you please check this out?
http://www.ortodoxism.ro/datasheets/stmicroelectronics/1458.pdf
if I buld the "Typical application" schematic will I have a working amp? Will it be 1 channel or 2 channel?
Thanx in advance!
http://www.ortodoxism.ro/datasheets/stmicroelectronics/1458.pdf
if I buld the "Typical application" schematic will I have a working amp? Will it be 1 channel or 2 channel?
Thanx in advance!
Each of those triangles in the middle of the schematic represents only ONE amplifier circuit. The rest of the parts are to make that one go.
Two will be required to get a rated 2x12W.
Two will be required to get a rated 2x12W.
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