Group Buy for LM4651/ 4652 Subwoofer Amplifier PCB

[DSchmidt]

Is there interest in doing a group buy for a PCB for the LM4651/ 4652 Sub Woofer Amplifier chips (National Semiconductor: http://www.national.com/pf/LM/LM4651.html).

This group buy would be for the printed circuit board and possibly components depending on everyone's interest. The printed circuit board would be double sided, with solder mask and silk screen.

Cost will depend upon quantity. I'm thinking the design would be identical to National's eval board which is a proven design and gives some flexibility.

Let me know if you are interested.

 

[jaudio]

Im in for ? . Depends on price.

 

[jimbo1968]

Perhaps if you started a thread to discuss the advantages over using say LM4780 you could drum up some more interest?

 

[curva]

advantages are clear: class d and more power. perfect for a subwoofer...

I am in, it depends on the price how many.

 

[Brion55]

I might be interested in a few depending on price.

 

[nullspace]

Sounds like an excellent project.

I'm in for 2, maybe 3 depending on pricing.

 

[Bricolo]

is it a group buy for the subwoofer pcb or the "full range" pcb?

 

[curva]

the way I see it these chips can be used only for a subwooooooooo woooo wooooo woooooo

 

[agent.5]

I need a bit more than 170W though. Will your design allow us to parallel more chips for more power?

 

[leadbelly]

Maybe you should post something in the Class D forum? You seem to be attracting quite a few stupid posts.
I may be in depending on price.

 

[Andypairo]

If someone wants the chips....

I have 2 each of these chips but probably will never find a use for them.

Will gladly give them to anyone in need (just pay the shipping costs) or in exchange for some audio-related components (in this case each pays its shipping).

cheers

Andrea

 

[jaudio]

DSchmit

Have You research price per board? If you have let us know the price ranges.

 

[spudspud]

completed mi LM4651 amp

Hey up folks, been a while since i was here sounding out info on this amp, but I done it, well the full range part *2 for stereo and left a space for the sub channel which I intend to build when money and time allows. It was for my HNC project at college, but obviously also for my personal use, and what can I say it is the most amazing system i've ever heard, except possibly the one in Glastonbury dance tent in 2000. The volume is pretty mental too (unbelievable for 60 watts). Other people who's been round and heard it, their jaw drops and there gutted bout buying there £1000's of consumer equipment.Iv'e tested it to death, but it won't die and this weekend its doing a small party so I'll get an idea of its sound outdoors.
So, I hope this is read by all those who slag it off, saying it won't work or will sound **** or is easy to blow up (this did happen to me when my probe touched the VCC and the pin next door by accident, but what do yer expect) and I can now afford to have a little gigle at their expense HA HA HA HA. Anyway national semiconductor wouldn't lie bout its specs was always my theory.
Anyroad, the two reasons i'm here is not to gloat, but firstly to say give me a couple or three weeks and i'll have gear to knock up your boards if yer interested ( NO SLIDING SCALE PRICING will be applied here ) i'll print the costing if yer want, can't say fairer than that. Also, does anybody know the legalities of producing units of this amplifier and others for sale cos I'm an engineer not a lawyer

 

[spudspud]

blown up

PS. the channel I blew, I just ripped out the DSP and chucked a new one in.
Next job is to do a parrallel OP double up

POST YOUR INTREST IN BOARDS TO ENCOURAGE ME

 

[thomas997]

I need a bit more than 170W though. Will your design allow us to parallel more chips for more power?

Easy solution: use a dual voice coil sub and buy two of the amps..

 

[Nisbeth]

Re: blown up

POST YOUR INTREST IN BOARDS TO ENCOURAGE ME

Consider me interested, but I'd prefer a design that does not blow up in my face


/U.

 

[jleaman]

Any pictures of the pcb befor i say yes to a pair ?

 

[spudspud]

here's some but these are prototype's, the ones I'll do will be with better equipment and i was thinking of plating em all over.
I'm not drilling em though cos I aint going to be CNC capable, but if I drill a few holes to make sure the layers line up i can't see a problem

 

[spudspud]

sub channel

 

[spudspud]

full range

will post some more in a couple of weeks when I've made some up with mi new equipment, best get busy eh