6.3v indirectly heater valve PCB (possible group buy?)
- IslandPink
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#16
More power to your Darlingtons !
So that's a bit bigger than a TO-220 , looks like M4 through-hole.
I'm guessing with about 3W dissipation it might not need a heatsink for 6.3V, 0.75A ?
How big's the yellow thing ?
I think I'll have 6-off too .
So that's a bit bigger than a TO-220 , looks like M4 through-hole.
I'm guessing with about 3W dissipation it might not need a heatsink for 6.3V, 0.75A ?
How big's the yellow thing ?
I think I'll have 6-off too .
"Once you find out ... the Circumstances ; then you can go out"
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#19
How many depends on cost I am afraid.
- pre65
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#20
Same here.Paul Barker wrote:How many depends on cost I am afraid.
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- Paul Barker
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#21
How many depends on cost I am afraid.
#22
No problem, we'll try to do this as cost effectively as possible. The boards will be supplied at cost plus postage and price for a jiffy envelope plus any parts supplied; the more buyers we get, of course, the better the deal.
Basically, the process is the same as the start up PCBs Nick supplied last time.
Andrew
Basically, the process is the same as the start up PCBs Nick supplied last time.
Andrew
Analogue, the lost world that lies between 0 and 1.
#23
Hi Andrew.
I will take 8 as long is the price isn't too prohibitive.
Best Regards
James.
I will take 8 as long is the price isn't too prohibitive.
Best Regards
James.
- Cressy Snr
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#24
I'll have half a dozen if the price is right
Steve
Steve
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#25
TIP142 can be TO-220 and TO-247 (aka plastic TO3), size affects power dissipation as you might imagine. TO-247 is 160W or somesuch.IslandPink wrote:So that's a bit bigger than a TO-220 , looks like M4 through-hole.
I'm guessing with about 3W dissipation it might not need a heatsink for 6.3V, 0.75A ?
I'd still want to use a bit of metal plate or something, better a kosher PCB mounted heatsink, even if it's 'only' 3 Watts
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- IslandPink
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#27
Yes , if it is 3W , then maybe I will add something to keep temps down .Mike H wrote:I'd still want to use a bit of metal plate or something, better a kosher PCB mounted heatsink, even if it's 'only' 3 Watts
"Once you find out ... the Circumstances ; then you can go out"
#28
The plan, as per Nick's idea, is to have the heatsink on the PCB, the two IC's will both use the one heatsink placed back-to-back; that keeps the costs down as only a single good quality heatsink is required.
Andrew
Andrew
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#29
Yes you could, in that case maybe one of them 60mm high ones, with the solder pegs, RS do 'em
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."