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.
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.
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: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
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.