I'm very excited by all this. There are two amp boards, one will give an amp similar to the mighty TOCA. Adding the second board takes the build to Iridium crushing levels (!!!), according to our resident evil genius/mad scientist.
Also, the third board (regulated power supply) is required (I think - unless the simple version of the amp can accept a boot-strapped PS like mine?) - this is great! I plan adding the PS board to my existing amps.
The level of performance Colin is proposing is simply ridiculous at anything under many thousands of pounds. Good times are coming!
Col, if I got this wrong give me a shout! Or Dave, he can delete the post.
The PCB are fibre glass to UL94V standard it means it hard to burn them not like most cheap and nasty electronic PCB from overseas which are basically Paper mush covered in Cu.
The standard PCB are what known as 0.5oZ - 1oZ these mine are 2oZ and double sided and plate not pin thru.
Thus bigger than normal current can be used and the resistance of the tracks are less. This also help as in a question from Hi-fi Answer Microphony because the mass or the track is higher so damping occurs.
As to cost I have managed to get these high grade PCB produced at a reasonable cost because I have bought a hell of a lot on a gamble I can sell them all, the tooling cost was high but I can get that back on about 500 PCB's.
Does this help? yes my own sign on was hijacked like my Facecrap page by a nice man in Somerset I suspect.He did mean well but not to me. And he was wrong.
Just a thought Colin, you could do a chassis kit and/or build service on something like Kickstarter and get the necessary funds up front before assembling. I think this would create a lot of interest and help in terms of the demand.
Something like:
Option 1: Full kit - chassis, pcbs, parts
Option 2: Full kit assembled - limited run according to what you can build
Option 3: PCBs & chassis for those with parts bins
Option 4: A few signature dual mono builds or something like that
only £25 inc VAT and delivery, and the spacing between the fins is 45mm, which looking at the pcbs looks to be just enough to be able to mount the board nicely. Only 1 left in stock, but only a 4 week lead time. Cheapest place I found them.
At 125mm wide as well they fit the board perfectly. I notice 225va transformers are usually around 120mm as well, so a case could be built around these heatsinks placed vertically.
Thanks Spev. Probably a question with an answer known by many, but not me... I notice the heat sinks are rated at: 0.42°C/W What does this mean (something to do with number of degrees centigrade lost per watt...?) and how it measured?
only £25 inc VAT and delivery, and the spacing between the fins is 45mm, which looking at the pcbs looks to be just enough to be able to mount the board nicely. Only 1 left in stock, but only a 4 week lead time. Cheapest place I found them.
A bit small, try E-bay James found some there the right size .
He was here today and we went over is monster SECA he is build and doing a fine job well done James.
only £25 inc VAT and delivery, and the spacing between the fins is 45mm, which looking at the pcbs looks to be just enough to be able to mount the board nicely. Only 1 left in stock, but only a 4 week lead time. Cheapest place I found them.
A bit small, try E-bay James found some there the right size .
He was here today and we went over is monster SECA he is build and doing a fine job well done James.
My plan at the moment is to have the two 250mm sinks side by side to give 250x250 and get some 300x250 alu sheets to form a box around them, with the sinks as the front panel, maybe do a wooden back panel.
Thanks Spev. Probably a question with an answer known by many, but not me... I notice the heat sinks are rated at: 0.42°C/W What does this mean (something to do with number of degrees centigrade lost per watt...?) and how it measured?
Transformers are piggin expensive these days though. Cheapest non generic ones I've found so far are airlink, but still £72 inc vat and delivery for a pair.
I won't tell you how much I paid for mine then for my 40W Class A Mother Trucker then.....
Comments
Very reasonable...!
Also, the third board (regulated power supply) is required (I think - unless the simple version of the amp can accept a boot-strapped PS like mine?) - this is great! I plan adding the PS board to my existing amps.
The level of performance Colin is proposing is simply ridiculous at anything under many thousands of pounds. Good times are coming!
Col, if I got this wrong give me a shout! Or Dave, he can delete the post.
www.hifianswer.com
ww.hifianswers.com/
Later I'll do the test of the kit and transplant my current amplifier boards, as the new boards will drive my IGBT output devices just fine.
One of these kits is on my to-do list. :-)
Early Christmas present perhaps...?
Probably a question with an answer known by many, but not me...
I notice the heat sinks are rated at:
0.42°C/W
What does this mean (something to do with number of degrees centigrade lost per watt...?) and how it measured?
Bear in mind the length is 250mm
I cut mine in half, will fit side by side with a copper heat spreader.
50mm length caps are too big for case, so had to order some shorter ones from mouser......opps