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Old 26th April 2005, 01:29 PM   #531
dhole is offline dhole  United Kingdom
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thanks for the advice Brian. I am considering the aleph 5 aswell. As ihave a parts list. I do however on the parts list for the 5 have the higher wattage resistors as 10w is this really needed ? It isnt marked on the schematic as with the 60.
also would I need to put a heatsink on the 9610s ?
dave
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Old 26th April 2005, 01:35 PM   #532
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by dhole
thanks for the advice Brian. I am considering the aleph 5 aswell. As ihave a parts list. I do however on the parts list for the 5 have the higher wattage resistors as 10w is this really needed ? It isnt marked on the schematic as with the 60.
also would I need to put a heatsink on the 9610s ?
dave
I think that 3w should be fine for the resistors. You don't need a heatsink for the 9610 devices. Nelson didn't use them in the Aleph 30 or Aleph 60 amps.

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Old 26th April 2005, 01:42 PM   #533
dhole is offline dhole  United Kingdom
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and 3w for the aleph 5 ?... sorry to bore you with tedious questions
dave
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Old 26th April 2005, 01:46 PM   #534
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by dhole
and 3w for the aleph 5 ?... sorry to bore you with tedious questions
dave
That is my assumption.

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Old 26th April 2005, 01:58 PM   #535
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Pass Labs are using Panasonic resistors there, and those resistors are available in 3W maximum rating only (from D-K), so go figure

Besides, you can use equasion: P=U2/R, both valuse are given in schematics, so power can be calculated.
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Old 26th April 2005, 02:00 PM   #536
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by Peter Daniel
Pass Labs are using Panasonic resistors there, and those resistors are available in 3W maximum rating only (from D-K), so go figure

Besides, you can use equasion: P=U2/R, both valuse are given in schematics, so power can be calculated.
Panasonic makes the same resistors in 5w, although, I haven't seen a supplier that sells them:
http://www.panasonic.com/industrial/...OA0000CE18.pdf

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Old 26th April 2005, 02:29 PM   #537
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In Aleph 5, max. 1A will flow through each source resistor. This means that max. power dissipation across each source resistor will be 1W. Even if my estimation includes certain error, I think that the 3w grade resistor is still acceptably enough.

The four current-sensing resistors of 0.47Ohms 3W will be equivalent to one 0.12Ohms of 12W. Here also, the 3W grade is big enough. Good luck.

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Old 26th April 2005, 03:19 PM   #538
dhole is offline dhole  United Kingdom
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whatdo yuo call those pcb mounted connectors that have the screw to secure wires ?
dave
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Old 26th April 2005, 03:21 PM   #539
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by dhole
whatdo yuo call those pcb mounted connectors that have the screw to secure wires ?
dave
terminal blocks. You are better off with just soldering the wires, as it provides a better connection.

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Old 26th April 2005, 03:25 PM   #540
dhole is offline dhole  United Kingdom
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I was just going to use them on the power connections.
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