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Old 8th May 2004, 03:28 PM   #1
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Angry LM4651/4652 pcb?

Where can I get pcbs for the LM4651/2 digital amp?
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Old 8th May 2004, 03:57 PM   #2
groyne is offline groyne  India
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check this out:

http://www.national.com/appinfo/audi...19,968,00.html
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Old 8th May 2004, 04:09 PM   #3
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what i meant was where can i BUY pcbs for those chips?
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Old 8th May 2004, 10:06 PM   #4
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xplod1236 !

I have made one PCb fo r the LM4651/52 chip-set, it was like a "first shoot" and I am working on a version 2.0, so if you can waite......................................

Have fun

Thomas
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Old 8th May 2004, 11:53 PM   #5
Ryssen is offline Ryssen  Sweden
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Quote:
I have made one PCb fo r the LM4651/52 chip-set, it was like a "first shoot" and I am working on a version 2.0, so if you can waite......................................
I am interested to.......
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Old 9th May 2004, 12:38 AM   #6
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count me in as well...
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Old 9th May 2004, 03:30 PM   #7
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Quote:
Originally posted by tlmadsen
xplod1236 !

I have made one PCb fo r the LM4651/52 chip-set, it was like a "first shoot" and I am working on a version 2.0, so if you can waite......................................
Can't you take a photo and show us what you have so far?
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Old 9th May 2004, 03:50 PM   #8
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If anyone needs any chipsets for these, I have had three sets sitting around for ages from a project that never got off the ground. Not too bothered about getting any cash for these, so I would swap for just about anything interesting.
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Old 10th May 2004, 10:16 AM   #9
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Can't you take a photo and show us what you have so far?


Per-Anders, you are asking me to show my incompetence in public !!!
I think that I am in good hands here, so it is all right and I don't mind showing itˇ_ˇ_ˇ_ˇ_ˇ_ˇ_ˇ_.

The PCB was made about 2 years ago and was declared "dead" about a year ago after extensive modification and experimentation of it. I had to remount the LM4651/52 chip-set, and the inductors again to take the picture (this is the reason that the LM4652 are not screwed on to the heatsink like it normally would).
All the op-amp socket is for all the "extra" circuit that I originally indented to be part of the design. It where to be a amplifier for a subwoofer and the next version would also be for subwoofer use, but there should not be anything preventing you form using it full range if you want that

The schematic was more or less on of the set-ups shows in the datasheet for the LM4651/52. It was not a problem to get the LM4651 to modulate, but it was a real "pain in the butt" to make it "interface" with the LM4652 and make that do the modulation as I recall itˇ_ˇ_ˇ_ˇ_took forever and a lot of troubleshooting. When I finally got it to work I decided to go for a new interaction of the PCB (ˇ_ˇ_and I am coming around to do this now).

I have the following in mind for the new PCB (version 2.0):

A. On-board PSU (-trafo) like the first PCB. This can be seen on the pictures. All you would need to add would be a transformer.

B. Same inductors as the first PCB. Can also be seen on the pictures. They are from CoilCraft.

C. Other type of connectors for the trafo. Some kind where you "squeeze" the wire, since the wires coming form a trafo are offend single stranded, which makes them difficult to use with the Faston-type of connecter I originally used.

D. The LM4652 will be moved out to the side of the PCB so an external heatsink can be used. If you mount the PCB into some kind of chassis you can use that as heatsink. It really doesn't get very hot.

E. To types of input, both "mono". One called "direct" without any kind of filter and the other one with a fixed 4.order lowpass. The first one is to be used if your SS-amplifier already has a good lowpass filter build in. (not many have!!).

F. After the input section the signal goes to a "linkwitz"- seal boxed EQ (I love that stuff).

G. Maybe an "Auto on/off"-circuit. This would just bring the chip-set into stand-by.

H. No fuses as there are on the first version. If everything works you don't really need them. If you "kill" one of the chips the modulation are likely to stop the same second, soˇ_ˇ_ˇ_ˇ_

I. The size of the PCB shown on the pictures is standard EURO-board size, i.e. 100 x 160 mm (ˇÖ 4" x 6.3/8"). The new board are expected to be slightly smaller than this.

J. I expect that a board like this could be sold for around US$ 15-20.- + P & P. (ˇÖ US$ 6.-). Maybe a complete kit (-trafo) could be made for around US$ 70-100, but I can't buy components very cheap (here in Denmark), so it is most likely cheaper for you to get the components your self.

K. I expect to have a board ready in anything from 2 month to 12 month from now, so you might want to go somewhere else and find one......................



Comment and suggestions are very welcome indeed.

Regards

Thomas
(Maker of "Das Modul")
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Old 10th May 2004, 10:18 AM   #10
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Default Other angel

Same PCB, just an other angel

Thomas
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File Type: jpg other angel-low res.jpg (97.0 KB, 669 views)
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