The Wire LPUHP 16W Power Amp parts GB

[Ed LaFontaine]

Unit prices, using the original BOM

ME49990MA-5-ND $3.41; 120 pieces is ~$409

LME49600TS-ND $6.53; 320 pieces is ~$2100

A complete kit, based on 40 units purchased will cost the user "about" $120 + fees.

This could become a significant expenditure of money to obtain significant savings. I will look for suggestions from you to balance the risks and rewards.

Be careful in consideration of swapping a different voltage transformer on-board...the footprint may be different.

[hochopeper]

@ED, those numbers look fantastic!

Originally Posted by qusp

dont know the costs, but you can guarantee that it'll be cheaper than buying yourself. i'm going to suggest making the standard order 20 pieces of buffer and 8-10 of the opamp, does anyone object to this?

For the purpose of the GB those numbers suit fine.

I wonder if we do it in lots sized for single channel - 8 (buffers) or 3 (opamp) OR we could go for stereo sized lots since everyone has even number of boards ordered.

Stereo sized packs reduce flexibility for anyone wanting extra though. They would however make packing of orders optimal for organisers compared to lots of variation in order sizes, I believe this was your intent with standard lot sizes?

Audio IC's

LME49600

qusp 40
hochopeper 32

LME49990

qusp 20
hochopeper 24

[qusp]

yeah that makes sense i guess. TBH there isnt that many of us in the list, so workload shouldnt be too high. maybe we just make the ICs an open thing, you can get the numbers you like? or specify what a channel kit is and have a separate column for extras?

so an order would look like

for example

IC's

qusp 4 channels
extras 6 x LME49600 and 10 x LME49990

@ Ed: yeah i think the savings will come more for the passives, we will have to watch it though, as most individual orders from digikey would be over the 200usd free shipping amount, so depending on what the regional and local shipping added up to, the digikey may not save a heap. i suggest we make an effort to cost out the bom from the suppliers asap to decide whether its worth pushing forward on that, or whether its just best for the heavier items to be grouped regionally.

does that make more sense?

i think if everything gets pooled and then sent out all together to the regional distributors it will save on shipping then rather than being stung for multiple international shipping fees for heatsinks from Hypertune, transformers if we do that, eichmann connectors, which btw look like this, XLRs, IEC inlets (depending on consensus with the chassis) momentary switches, mounting hardware etc as these will probably be sourced from a few vendors

[qusp]

does that make more sense was supposed to refer to the example for the IC order, not the question i asked of you Ed

[jazzm]

Interested in 2 heatsinks

qusp 4
hochopeper 2
opc 6
bcg27 2
1543 2
Neb001 4
enantra 2
jazzm 2
_______
total 24

T.

[qusp]

ok guys, well i should have my boards sometime next week, SOOooo whats next chaps? i've put together a single BOM for the passives and transformers at DK and a single channel including TX is $94.87 which includes a couple of lines (resistors) that will have enough to cover more than 2 channels due to 10 piece minimum. this also includes the half-brick heatsink in the BOM

I propose these are optional items you can add to the kit as a subsection of the passives GB.

there are only 6 of the TX in stock at DK anyway and not due in till 6/12/2012, so forget that! now ive said that theres probably none left. i was going to contact Richard Sumner about some anyway.

So without the actives, which i will price up separately and actually including the TX and heatsinks for now, we actually get a rather nice saving that i think even the shipping costs for distribution wont come close to covering.

For example 30 channels we get it for total $1,714.89 / 30 = $57.163 a channel, not bad! this actually even includes getting 20 extra 10uf X7R (buffer rail decoupling) and 70 extra 1uf X7R (the part for decoupling the LME49990 rails) because it was actually a couple dollars cheaper to get 250 vs 180 as we breach the next bulk rate, so we would get a couple extra each, or you could donate them all to me =P

The TX is an issue, ive emailed Richard at sumR to see what he can do price wise and with him we could get 16-17vac secondaries to cover that slightly tight margin without adding extra heat. I dont know about you, but i'm not waiting around till June for the TX in the BOM and then paying extra shipping.

i'll price up the actives and have a look at some of the other possible parts, but in the meantime lets get conversation happening again, because opc has shipped the boards!! I wont update the first post with these details just yet, but its looking promising!

i gotta say, the discussion about automation, power cycling, remote and sensing is getting very interesting!

[bcg27]

Sounds like a pretty good discount to me. I think the trafo from sumr is definitely the way to go as it will give us a bit more headroom before the regulators drop out. I guess it depends how expensive they turn out. What were the specs of the transformer?

[opc]

Hi Guys,

I think this is a drop in replacement for the transformer and there are 500 in stock:

TE70063-ND

Someone needs to double check it carefully against the other datasheet to make sure it matches exactly!

All the sizes are listed, I just don't have time at the moment.

Cheers,
Owen

[qusp]

without the half brick sink or TX if we order enough to cover 30 boards it comes out at $95.53USD per channel, including the LME49990 and LME49600. not bad at all!

[jacobthellamer]

I could be interested in the GB without the transformer/heatsinks.