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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th February 2013, 02:29 PM   #171
DUG is offline DUG  Canada
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10uH, higher current rating...for higher current

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Old 17th February 2013, 03:33 AM   #172
kp93300 is offline kp93300  Malaysia
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Dug
Very nice work, You made the pcb yourselves ?


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Old 17th February 2013, 04:52 AM   #173
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No, I did not make the boards but I did the layout, soldering, etc.

The other thing I did not do was mil the 1mm recess in the bottom of the heat sink...CNC guy did that for me.

Sounds great...(IMHO)
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Old 8th March 2013, 08:40 AM   #174
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Hi KP, have you received you board and listened to it. What do you yhink, also any mods in mind for it.
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Old 12th March 2013, 06:46 PM   #175
kp93300 is offline kp93300  Malaysia
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Quote:
Originally Posted by tabarddn View Post
Hi KP, have you received you board and listened to it. What do you yhink, also any mods in mind for it.

. Will report back in about 2weeks from now. Received the mic board just before I went travelling
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Old 29th March 2013, 08:39 AM   #176
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I just asked Cristi of Connexelectronic if he would consider designing an amp based on the new TPA chips. He just replied that he would consider designing an amp, possibly with onboard smps which is his specialty. I've used several of Cristi's amps, they are very very well designed and he has many happy customers. I suggest anyone interested in these TPA chips head to the Class D Connexelectronic forum here to let him know there is interest for such an amp!
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Old 29th March 2013, 10:05 AM   #177
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cervelorider (posts here) built me a tpa3100 amp (parts express board), I'm sure he'll build you one too.
Here is is very nice website.
http://www.fleawatt.blogspot.com/
But I think he's moving on to tpa3122 now.

I just hooked mine up this morning.

Click the image to open in full size.

FLEAWATT : Fleawatt Cigar Box Amplifier

I'm using it with a revealing 110db jbl 2407 compression driver on a nice round mcm horn (54-580).

Click the image to open in full size.



Has anyone bridged the 3110 ?
Seems to me the lack of output filter (only ferites) goes a long way on improving the sound vs a 12 or 18db filter with their numerous parts.

Norman

Last edited by norman bates; 29th March 2013 at 10:08 AM.
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Old 29th March 2013, 12:01 PM   #178
xrk971 is online now xrk971  United States
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Norman,
Cervelorider makes nice stuff and is a great guy. I think the 3110 is designed for ferrite bead chokes if the speakers are very close to amp with short run of like a foot (like a boom box). I think their literature says to use a real wound inductor and capacitor and resistor network filter for long runs up an external speaker. Also, I think it is bridgable but not sure if the Sure board is set up to allow that. How does it sound with your CD and horn setup?
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Old 29th March 2013, 03:01 PM   #179
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tpa3110 is already bridged. Tpa3116 and Tpa3118 are both the same chip, one with heatsink pad up allowing adding of heatsink above chip and other using pcb for heatsinking thus the lower power ratings. Thats why I said you already built tpa3116 since your dead bug chip was upside down with heat pad up.

tpa3130 is lower current version more suitable for 8 ohm loads.
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Old 29th March 2013, 04:45 PM   #180
xrk971 is online now xrk971  United States
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Capt Grogg,
You are serious? The difference is in the orientation of powerpad only? That may not be true because the letter designations following the chip number DAP (down) vs DAD (up). Why didn't they just call 3118D2 the 3116D2DAP? Neat if so, I can say I know what the sound of the 3116 is like - the same!
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