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Old 19th June 2011, 01:51 AM   #1121
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here are the readings taken relative to ground

1st MOSFET 27.2v, 27.2v, 21.9v
2nd MOSFET 27.2V, 0V, 27.2V
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Old 19th June 2011, 01:59 AM   #1122
Salas is offline Salas  Greece
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You just had to measure difference between pins 1,3 but it can be calculated from what you got ref to ground also. The second set of measurements shows a dead Mosfet with no Vgs voltage developed. That will not exclude other semis are hit, but change that one first.
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Old 19th June 2011, 11:07 AM   #1123
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Vgs = voltage between gate and source.
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Old 20th June 2011, 10:23 AM   #1124
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Cheers Salas and Andrew,

I suspected Vgs was that measurement, but also was interested in the other readings relative to - plus felt safer with only one dmm probe near the MOSFET pins.

Have now swapped out all of the sk170s in the regulator section and both misdeed, just in case. Have not changed the c550 as didn't have a spare. Still getting the same readings across the misdeed.

When I removed the pcb I could see that the there was a small trace of solder shorting the + rail to gnd just before the B1 section
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Old 20th June 2011, 10:27 AM   #1125
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Misdeed = Mosfet.
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Old 20th June 2011, 10:29 AM   #1126
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Builder Brad View Post
Quote:
Originally Posted by Builder Brad View Post
Misdeed =
there was a small trace of solder shorting the + rail to gnd just before the B1 section
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Old 20th June 2011, 10:37 AM   #1127
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Misdeed, indeed. Probably a freudian slip, not my autocomplete lol.
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Old 21st June 2011, 01:52 PM   #1128
Marra is offline Marra  United Kingdom
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I am assembling a second Hotrodded DCB1; first stage with 10 0hm resistors and wondered if 3 amp/100V Schottky diodes would be ok instead of MUR860's? I have some in my parts bin is all.
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Old 21st June 2011, 01:57 PM   #1129
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Quote:
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I am assembling a second Hotrodded DCB1; first stage with 10 0hm resistors and wondered if 3 amp/100V Schottky diodes would be ok instead of MUR860's? I have some in my parts bin is all.
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Old 21st June 2011, 02:11 PM   #1130
Marra is offline Marra  United Kingdom
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Thanks; thats saved me a couple of quid
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