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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st October 2004, 06:39 AM   #1
amt is offline amt  United States
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Default $30 amp upgraded

Well I moved this from the Digital section since this one didnt exist then. I finally upgraded the Sonic Impact and I must say Im shocked at the quality of sound. I replaced the plastic chassis with Al, used Cardas RCAs, decent binding posts, and hooked it up to a 9.5AH 12V battery. The original input was a mini-jack that routed the signal around the board until it got to some cheesy wires that attach to the pot. I removed the jack and ran the inputs directly to an RS pot (100k alps). I also removed the entire wiring mess that ran between the board and the pot/switch. And while I was at it, I replaced all the original wiring, except for the light.

All in all I must say this is a great sounding amp. Ive listened to it on my Stax headphones for hours at a time and never got fatigue that is often the case with SS amps. The sound is somewhat dry BUT extremely articulate. Crisp with zero sizzle. Metallic sounds are superb. Cymbels, cow bells, and percussion in general are great.

Im going to hook up the high efficiency speakers next and see how it fairs on them.

amt
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Old 1st October 2004, 06:40 AM   #2
amt is offline amt  United States
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Here a shot of the guts.
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Old 2nd October 2004, 05:56 AM   #3
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Coolness! Good job!

I've had an SI amp here for a while but haven't got 'round yet to doing any modding.

se
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Old 2nd October 2004, 05:21 PM   #4
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Very nice work. I have a couple of these guys that I've been intending to do something with, but haven't gotten there yet. Just gotta find the time....
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Old 9th October 2004, 05:01 AM   #5
rtalk is offline rtalk  United States
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Default Great mod!

I just picked up one on clearance at my local Super Target ($24.98 - with SI's pyramid cardboard speakers and backpack included!) and want to do a project similar to yours. Would you mind letting me know what potentiometer you used (make/model) and where it can be procured?

Thanks and great job!

Robert
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Old 9th October 2004, 03:45 PM   #6
amt is offline amt  United States
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The pot is an Alps dual 100k sold at Radio Shack. They are $3 and work okay but are not exactly precision devices. I used it because I had it laying around but unless you have very sensitive speakers, a 50k will work better. Im going to replace mine when I get the time.
Good luck.

amt
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Old 15th October 2004, 12:47 AM   #7
rtalk is offline rtalk  United States
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Default Amp's enclosure

I really like that shiny enclosure! Where did you get that? Do you know of any sources for cool enclosures like that?

Thanks,
Robert
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Old 15th October 2004, 04:50 AM   #8
rtalk is offline rtalk  United States
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Default RS Alps dual stereo pot wiring

I finally have taken my Sonic Impact apart in an attempt to create a beautiful amplifier like amt has executed so well above. (This is my very first DIY project.)

I can hook up almost everything from the excellent internal photo amt supplied above, however:

I see that the Sonic Impact board has connections for the potentiometer/power on cable labled:

" V + R L G L R "

I'm guessing this is how the connections are made (in the order they appear):

"V" = (I don't know on this one.)
"+" = to one side (positive side) of the power switch
"R" = from the right input's positive connection thru the pot and into this R
"L" = from the left input's positive connection thru the pot and into this L
"G" = to the other side (ground side) of the power switch
"L" = from the left input's ground connection thru the pot and into this L
"R" = from the right input's ground connection thru the pot and into this R
Is this correct as I don't know how to hook these to the Radio Shack potentiometer? These connections are my only remaining obstacles.

Can someone tell a newbie like me how to wire the potentiometer and on/off power switch to these terminals?


Thanks,
Robert
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Old 15th October 2004, 08:56 PM   #9
amt is offline amt  United States
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Hi Robert

Heres what the wires are: ( V + R L G L R)

V and + = power into and out of the power switch
R = right signal input from pot
L = left signal input from pot
G = common ground to both channels
L = left signal input to pot ( abandoned)
R = right signal input to pot ( abandoned)

Heres a diagram that should help. One word of caution though: be very careful de-soldering and soldering around all those SMDs. Too much heat or stray solder will raise heck with the board and components.

Thanks for the complement on the chassis. Ive built three of these for friends and may produce some for sale. They are fabricated of architectual aluminum channel 6063 and 6061 bar and round stock. Ive put this on temporary hold since Im working on a CD-ROM transport chassis at the moment. I will probably offer it with or without inexpensive components and pre-drilled holes.
Send me an email if interested at ampbox@comcast.net


amt
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Old 15th October 2004, 09:45 PM   #10
brianuk is offline brianuk  United Kingdom
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Top notch chassis, well done!
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