DIY subwoofer amp

[JAZZ2250]

how did you drill the holes in the correct places? did you use a template? if so, how did you make it?

I usually make the holes (both for drivers and ports) using a router and jigs. For smaller holes I use the one from PartsExpress (Jasper Jig). For larger holes like the one for 8" driver, I use what I made.

 

[Matttcattt]

i meant in the aluminium for the amplifier 🙂

 

[JAZZ2250]

i meant in the aluminium for the amplifier 🙂

I don't think you asked the holes for OPA549 because it's simply making a 6-32 hole/thread.
As for the OPA541AM in TO-3 package, yes, I used a sort of template. I downloaded the datasheet from TI, copied the mechanical drawing of the chip, pasted it into a graphics software and resized it the exact size of the amp. Then, I punched the location of holes using the printout as a template. And then, drilled holes. I drilled two larger holes for mounting the chip the the aluminum plate. Attached is the mechanical drawing of OPA541AM.

 

[JAZZ2250]

And this is a prototype amplifier on a 0.25"-thick aluminum plate. 🙂
I used an inverting amplifier configuration with 2.2uF input cap, 22k at inverting input, 220k for feedback, 22k (or 15k, not sure) with 0.1 uF btwn non-inverting input to ground.
I'm not really sure if this is good as a subwoofer amplifier. It would be great if anybody could give me some advice.

 

[Matttcattt]

thanks a lot 🙂

 

[TweedLe]

Amps

Im getting the kicker L7 sub 15" and its rms is 1000 and peak 2000 watts, what size of amp will be good for this sub, i found a fosgate thats 1000 rms , 3000 watt peak. will that work or is that too much watt???