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The Wire LPUHP 16W Power Amp parts GB

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#81
Thanks Randy, yes it makes it more than difficult, so i'm glad you put your hand up.

If there are others in the background doing the same as Randy, speak up or forever hold your peace!! We will be catering for those that express firm interest, there will be noone buying extra parts to distribute to people who miss out, or putting together kits at a profit, there will be no last minute additions and if a module is dropped due to lack of interest, that will likely be it, unless decided by the group that its worth it vs the time involved to save everyone X amount of money

Exact pricing will be based on the numbers at the time of calculation and we will not be calculating it again to shuffle someone else in. someone who contacts at the last minute will unfortunately be neglected and i do not intend to chase everyone up, past sending out a group PM to everyone in the GB in the next day after i hear something back from Richard most likely.

ive sent off the TIM requests for quotes as well, so i expect to hear back from the US and/or Singapore Kerafoil distro in the next day or so with a few options, so please also some expressions of interest there.

I will be suggesting either buying it in tape or a stencil (Keratherm Red 86/82, 86/83 is too soft and at 0.09K/W Rth for 86/83 and 0.07K/W for 86/82) yes Tom the white isnt as good, i had for some reason thought it was better than the red i'm used to.

i have also asked them about the Keratherm Soft-therm, which is a putty containing ceramic particles, i thought it might be interesting to fill the gaps

anyway thats it for now, i'll be back tomorrow after work

Keratherm Red TIM (thermal interface material) group expressions of interest

qusp
opc
HYPERTUNE
??
 
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#88
its looking like i can make both the TX and keratherm GB work. Richard can use a circular can thats looking like it will fit and he will add leads in the 'corners' to suit the secondary outputs and we can wire the dual primary inputs how we like, or perhaps even install molex type connectors, using the existing mounting hole in the center.

just working it out with him now, but i'm about to sleep, i'm going to try and work out a quote today after i get up so i can get the go ahead from those interested so he can get moving as it will take him a week to knock up a prototype after getting the cores in and another to produce. i think this is worthwhile to get a neater solution and also a solution that works for everyone without hacking the board. also the added little bit of headroom is nice and it actually looks like it will fit perfectly and i dont know about you, but i prefer the look of circular cans anyway
 
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#91
Posting regarding the sumr transformer, since it seems more relevant here than in the main thread. I think ~$40 is a great deal for what you get from sumr. I would be ok with molex connectors, they have been used somewhere on almost all of my builds. Also I am indifferent to solid core vs. stranded.
 
#92
I am also happy to go with the flow on solid/stranded.

I would like the quick connectors though if thats an option others are interested in? I'm considering an enclosure that will be a pretty tight fit and being able to disconnect at least the power leads to the board could be quite handy if I ever need to open the enclosure again.

I would prefer to wait for the optimal size parts to be procured, in no rush with this build.
 
#93
cool yeah me too, even if it turns out the smaller size costs a little more and takes a little longer due to them being special order cores etc, i'm good. I hope it was kosher to post the prices directly from Richards email, bu i dont see why not. Yeah molex for the power is ok as long as they are good secure connectors i'm fine, usually the molex power connectors are tinned copper anyway so thats fine (IanAS is having a heart attack!) how about we get the optional fused trannie? maybe another one in the speaker outs for protection since the board doesnt have any? haha sorry Ian.

do remember its an estimate, an educated estimate, but all the same even Richard doesnt have all the facts for the last option yet; i hope to hear back tonight.

the molex will just make it much easier to install in a small enclosure, rather than soldering or screwing in cramped spaces and maybe scorching a cap or some insulation; i bloody HATE that and it simply has to be replaced if it happens

signal lines should be kept pure and direct though.

Ok so i guess i'll start an interest check for the trannies

sumR Magnetics Custom potted Transformer Spec

Dual 115VAC primaries
dual 16VAC secondaries (under load)
26VA
Fully potted with preference for a 62.5mm diameter Can (this is confirmed a perfect fit, it simply could not be any better)
mounting hardware included
leads for primaries and secondaries

a more realistic estimated price ~40->45USD each


qusp 2
hochopeper 2
HYPERTUNE 2
bcg27 2
?
 
#95
neb001 said:
Custom potted transformer group buy? Count me in!

qusp 2
hochopeper 2
HYPERTUNE 2
bcg27 2
neb001 2
Click to expand...

yep, sorry should have made that clearer. and just to be clear about the format, the primary and secondary leads, will exit the circular can in each of their respective corners.

Those who have 115vac mains have the choice of wiring the primaries into the same pin locations the stock unit does and using the AC input on the PCB as normal, or connecting the primary leads directly to the IEC (or relay/SSR). Those with a more masculine 220-230VAC main voltage will have to wire direct to the IEC or relay etc, with no option to connect to the PCB in any really useful way, but no need to hack the PCB, which is a big reason i became interested.

I recommend connecting the primaries directly anyway, no matter where you live.

Ben, i'll shoot you a reply to your PM on Sunday or Monday, i'm out tomorrow through Sunday evening and i'm about to crash.
 
#96
Custom potted transformer group buy? Count me in!

qusp 2
hochopeper 2
HYPERTUNE 2
bcg27 2
neb001 2
1543 2

I do not want to hack the pcb for 230 V mains. This potted transformer is perfect solution. Thx 😀
 
#99
Wirewiggler, you wanted heatsink too? No keratherm?

I've put you on the list for heatsink.

Its easier for people to add themselves to list and latest list in thread should be up to date and save organisers of each 'module' digging through pages of the thread. Saves you being missed in the count later!

Custom CNC Alloy Heatsinks, kindly machined by Hypertune

qusp 4
hochopeper 2
opc 6
bcg27 2
1543 2
Neb001 4
enantra 2
jazzm 2
regal 2
wirewiggler 2
_______
total 28
 
#100
thanks mate, I had already added him to the list for both of them on the first page and only updated the thread list here for the transformers as there wasnt at that point a transformer list on the first page, but since its firming up now ive added the sumR list there too.
 
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