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Old 27th March 2013, 03:53 AM   #1
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Default Pass labs pearl 2 Need obsolete part

Hey! Im gathering materials to build a pass labs. Pearl 2.
I began the ordering process at mouser and it turns out the BOM (bill of materials) list floating around has an item on it that is now obsolete and unavailable.

Im refering to the semi-conductor designated to " U2 " on the pcb. It specifies mouser item number: 512-LM7924CT.
This is described as: IC volt reg 7924 24V TO-220. 1amp
Fairchild Linear regulators - standard 3 - term 1A negative voltage regulator.


Would the part specified for " U1 " on the pcb be adequate? The BOM lists these as seperate parts, with slightly different oart numbers but largely similar specs, except that the obsolete one is listed as "negative voltage regulator"

What can i use as an alternative? The mouser website just pops up with the very same one im ordering for the U1 slot... Can i use 2 extra 512-LM7824CT in lieu of the obsolete item described above, or will i run into porblems since the one specified is negative fixed?

I appreciate your help!! Im new to this, and im very excited. Quite the learning curve!


FormosaWest
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Old 27th March 2013, 04:08 AM   #2
Zen Mod is offline Zen Mod  Serbia
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LM7924 is all you need to know

you can buy it in nearest tobbacco store , and they're giving pack of 100pcs with every third six-pack you're buying ....... that's how obsolete part is

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Old 27th March 2013, 04:14 AM   #3
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Default Cant seem to find one...

.. No stock on mouser or digikey..

Sorry im new. Do you know where i can find lm7924.
Google just provides me with a million copies of datasheets...

How important is it that the fixed negative lm7924 matches the available fixed positive 7824.

I am new. Sorry.
Thanks!

Andrew
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Old 27th March 2013, 04:16 AM   #4
omishra is offline omishra  India
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Just look for 7824 and 7924 regulator in TO-220 package. That's all. They all are same.
Look at this

7824 can not be replaced for 7924, you must have 7924 for that negative regulator U2.

Last edited by omishra; 27th March 2013 at 04:19 AM.
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Old 27th March 2013, 05:31 AM   #5
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Thanks alot! I noticed that there where differences in loading 480mV vs 65mV. Not sure if it makes a difference but i went with the 480's

Thanks for the hand. I appreciate it.


Andrew
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Old 30th March 2013, 02:55 AM   #6
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Has anyone tried or have an opinion about trying the NTE version? NTE971 I believe.
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Old 30th March 2013, 04:07 AM   #7
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it's on third place
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