I'm sure you could buy one for far less than the components would cost you - just be careful over the specifications, most don't give RMS values. I've got all the Sony in-car amplifier manuals on DVD at work (as password protected PDF's) - but it would cost a fortune to build one, assuming you could get the special parts used.Short-circuit said:Hey everybody! I'm new around.
Ok, now my question: I'm about to build amp. for car and I could use some help First of all, does anybody happen to know where to find some circuit diagrams? And I mean real amps - something like 4x75W[rms] and higher.
'Honest' power from a car battery is only 4 watts single ended, or 16 watts bridged (into 4 ohms) - but the manufacturers specs usually hype that considerably.stevez said:Worth noting - you will only get so much current to flow in a 2 or 4 ohm speaker at 12 volts. As power goes up it would seem that power supply voltage must increase as well.
And assuming that you are infact stepping up the voltage, because most normal amp circuits don't do that on their own, but rather rely on their power supply to provide the higher potential rails.Short-circuit said:But if not, never mind. Thnx anyway :wink:
BTW: It would cost me cca 50-60€ to build an amp of 4x75W[rms] - under condition that nothing gives nice light effects :roll: :lol:
fat-tony said:Major boo boo! - you used 12, that's peak to peak, you need to divide it by 2.828 to get RMS - which works out at 9 watts. In reality you're not likely to get 12 volts PP from a car amplifier, so 8 watts is more likely.Short-circuit said:Edit: Just realized that if you were driving a 2ohm load, you might get close.
P = V^2/R ==> P = (12*12)/(2) = 144/2 = 72W