"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets - Page 11 - diyAudio
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Old 22nd September 2011, 12:20 PM   #101
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Hehe, trust me I want the kits

Just spent a heap on other audio related bits and pieces so I don't want to commit to 8 kits yet but didn't want to miss out on the boards.

There is a very good chance I'll end up getting full kits off you though.

Maybe I could swap you for some CNC machined chassis?
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Old 22nd September 2011, 02:04 PM   #102
jtktam is offline jtktam  Canada
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Quote:
Originally Posted by opc View Post
They're available in the kit

Honestly guys, unless you already have the mosfets and the LME49830 sitting in a bag on your desk, I can assure you that the kit will be your cheapest option. I know the DK prices listed aren't the cheapest out there, but placing orders from 6 different suppliers to save a few dollars here and there will not be any cheaper. Digikey alone charges $9 for shipping, and that's if you live in NA.

I think a lot of people see the actual price required to build the amp ($78), and they think "Oh, that's a lot... I can do it cheaper than that". But when you add up all the little costs like shipping, picking up parcels, taxes or VAT, etc... you'll end up with the exact same parts, and might have saved $5 for your troubles. Chances are you will have spent more but won't realize it because you did it small bits at a time.

Again, I know a lot of you (like myself) have stashes of parts sitting around, and if you've already got half the kit then it's obviously not worthwhile. If you're starting from scratch though, the kit really is your best choice.

Cheers,
Owen
Owen

if they think they can do it cheaper, just let them.. no need to try to convince them :-)

i think that just for the convenience of not having to find all the parts would be a PLUS

-joe
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Old 22nd September 2011, 02:41 PM   #103
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by opc View Post
They're available in the kit

Honestly guys, unless you already have the mosfets and the LME49830 sitting in a bag on your desk, I can assure you that the kit will be your cheapest option. I know the DK prices listed aren't the cheapest out there, but placing orders from 6 different suppliers to save a few dollars here and there will not be any cheaper. Digikey alone charges $9 for shipping, and that's if you live in NA.

I think a lot of people see the actual price required to build the amp ($78), and they think "Oh, that's a lot... I can do it cheaper than that". But when you add up all the little costs like shipping, picking up parcels, taxes or VAT, etc... you'll end up with the exact same parts, and might have saved $5 for your troubles. Chances are you will have spent more but won't realize it because you did it small bits at a time.

Again, I know a lot of you (like myself) have stashes of parts sitting around, and if you've already got half the kit then it's obviously not worthwhile. If you're starting from scratch though, the kit really is your best choice.

Cheers,
Owen
Ok.. You sold me.. this was/is going to be a next year project for me, and was thinking that the Lateral Mosfets would be available at my usual vendors and I could order them when I was ready, but I see that they are not.... So, Please change my order to:

2 PCB and 2 Parts Kits..
Thanks
JD
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Old 22nd September 2011, 03:01 PM   #104
NicMac is offline NicMac  Italy
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I will take 4 PCB's and 2 part kits.
Cheers,
Nic
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Old 22nd September 2011, 03:10 PM   #105
pchw is offline pchw  United States
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Ditto, switch to
2 PCB and 2 part kits.
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Old 22nd September 2011, 03:41 PM   #106
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Has anyone noticed that the input impedance of the (-) input is about
130 ohms or so?

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Old 22nd September 2011, 03:47 PM   #107
qusp is offline qusp  Australia
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no problem =), but no I hadnt thought about it, i dont really have to worry about such things with the IV i'll be driving them with, it drives 28ohm in ear headphones all the way down, so this wont present a problem

Last edited by qusp; 22nd September 2011 at 04:08 PM.
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Old 22nd September 2011, 04:10 PM   #108
glt is offline glt  United States
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(Please correct my entry. Thanks!)

2x full kits

I like the Connex SMPS300R (one per channel) because it requires no heat sink. The higher voltage models are an additional cost. If there is enough interest perhaps Connex can do a group buy version for this project?
Connexelectronic
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Old 22nd September 2011, 04:40 PM   #109
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Quote:
Originally Posted by opc View Post
454Casull:

I would say that it's definitely worth your time, especially if you only have to do it once to improve 8 channels.

In terms of sonic degradation, you'll be missing out on 10V of headroom which comes for free (extra output power without extra dissipation) and your noise floor will look just like the one posted in the measurements.

Will it be audible? The 60Hz+ harmonics noise might be slightly audible with efficient loudspeakers, but otherwise I would imagine general sonic quality should remain the same. The big benefit is the reduced PSU noise that the regulator provides to the front end.

I'll let you decide.

Cheers,
Owen
Even without the regulated front end PSU, this amp will still probably be better than 99.9% of all the other amps in the world. Good enough for me.

Plus, I don't have golden ears - just an (lazy) interest in the hobby and a moderate amount of time to spare.
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Old 22nd September 2011, 05:41 PM   #110
AKN is offline AKN  Sweden
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Hi,

Nelson Pass makes a good point; anyone who plans to drive this amp balanced should take note. Hot (+) input ~7KOhm, cold (-) input ~240Ohm (resistor into virtual null).

Some input RF filtering is also a good measure, easy to implemet afterwards.
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