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Old 1st December 2009, 03:32 PM   #611
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For having a spare I guess.
Lol. I didn't think he'd put spares on the BOM.
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Old 1st December 2009, 03:48 PM   #612
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Merlin,

I'll take them off you - pm being sent now....

Fran
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Old 1st December 2009, 03:54 PM   #613
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68//68//10 should only give a total resistance of 7R. Something is wrong here, there should be more heat!!!

I'll do some checks later and report back. If I check the resistance as it is set up right now and the Vdrop across the paralleled resistors, that should tell me the current being dropped.

Fran
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Old 1st December 2009, 03:55 PM   #614
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Merlin - theres a V4.3 of the BOM!!!

Fran
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Old 1st December 2009, 04:05 PM   #615
Salas is offline Salas  Greece
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Quote:
Originally Posted by woodturner-fran View Post
68//68//10 should only give a total resistance of 7R. Something is wrong here, there should be more heat!!!

I'll do some checks later and report back. If I check the resistance as it is set up right now and the Vdrop across the paralleled resistors, that should tell me the current being dropped.

Fran
Around 300mA +/- 50mA due to particular Vgs and Leds standards must be achieved with 7R27.
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Old 1st December 2009, 05:10 PM   #616
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50x 2sk170bl - SOLD!!!
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Old 1st December 2009, 05:18 PM   #617
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Merlin - theres a V4.3 of the BOM!!!

Fran
Where can I find the new BOM? Has much changed?
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Old 1st December 2009, 05:29 PM   #618
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I happen to have it in my HD, so here it is again not to be searching around.
Attached Files
File Type: pdf DC Coupled B1 Shunt PSU V4.3.pdf (45.1 KB, 306 views)
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Old 1st December 2009, 05:33 PM   #619
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I have to go back to this later tonight, but the resistors in parallel do measure ~7R and I get 1.6V and 1.9V drop across them....


The heatsink is fairly big so maybe its not as bad as I thought!

Fran
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Old 1st December 2009, 06:48 PM   #620
Salas is offline Salas  Greece
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Originally Posted by woodturner-fran View Post
I have to go back to this later tonight, but the resistors in parallel do measure ~7R and I get 1.6V and 1.9V drop across them....


The heatsink is fairly big so maybe its not as bad as I thought!

Fran
The 1.6V side gives 230mA when the 1.9V side gives 270mA. Different Vgs to leds proportions between the particular P&N Mosfets. You can trim the 1.6V side even less for current set resistor value so it can go around 270mA too. Maybe 6.8R and 5.6R final resistors for 1.9V and 1.6V side respectively. For 280 & 285mA possibly. Your sinks seem like taking it very well.
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