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Would like some ideas for a 100W RMS power supply

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Well, it's actually a two-channel amplifier. It's written over it:
"2 Stereo Channels at 4 Ohms"

As for it's class, I don't think it will matter anymore since I already bought a 20A transformer so I don't think there will be trouble with it's consumption. Also, the speakers I have are 40W 4 Ohms so it is a match! :D

Just need to get my hands on the capacitor now. the rectifier bridge is already on it's way.

Last step now is the box: it's being calculated atm and I'll build it during the next week.
 

Most car speakers rely on the huge space in the trunk (boot?) of a car for half-decent bass sounds. I hope your boxes will be big enough for your speakers.
 
Don't worry, I actually made the calculations using some software and the speakers parameters. But thanks for the warning! :grin:
 

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