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Old 16th December 2008, 03:21 PM   #1
rtate is offline rtate  Canada
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Default linear regulator question

The regulators in my dvd 2900 are of the "NJM78 and NJM79"
family.
I have been considering upgrading these with some sort of drop in super regulators, however with 9 regs in the front left and right alone it could get very $$$.

So my question is, are the regulators in question better than average?

I read some where that they are better than the standard regs
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Old 16th December 2008, 03:48 PM   #2
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The regulators are probably very regular a 78xx and 79xx but when I read the datasheet they may be a bit better than average.
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Old 17th December 2008, 12:46 PM   #3
rtate is offline rtate  Canada
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It seems that the current rating is my biggest issue.
The stock regulators are rated at 1.5 amp and most super regulators are rated around 300-600 Ma...
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Old 17th December 2008, 01:13 PM   #4
AndrewT is online now AndrewT  Scotland
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I will guarantee that at least some of those 9regulators do not supply anywhere near 1500mApk.
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Old 17th December 2008, 01:46 PM   #5
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If the regulators in mind have no or small heatsinks, the current is very far from 1.5 A
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Old 17th December 2008, 02:13 PM   #6
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The NJMXX regulators seem to have better noise stats compared to the 7800 series. Ripple rejection seem to be about the same. This is all datasheet stuff -- fwiw. You could probably tweak up the performance a bit by using an adjustable regulator like the LM317/337 with a 10uF cap on the adjust pin, or go to one of the even lower noise regulators from Linear Tech.

Then it comes to a matter of real estate for a super-regulator -- My smallest super regulator (which is surface mount) still takes up a few square inches -- I don't know what the real estate situ is for PA's. The super-regs also require a bit more overhead so it's not necessarily a drop-in. When I switched to a super-reg in my much-modded Adcom GFP565 the performance improvement was noteable. Did the same thing with a Crown IC-150.
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Old 17th December 2008, 02:36 PM   #7
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I have made a quite small super regulator but I don't have any pcb's left and I don't plan to order any more either

Hypex has a quite small model
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