Murata 7805SR - worthwhile upgrade over standard 7805 or 317? - diyAudio
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Old 12th January 2011, 09:18 AM   #1
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Default Murata 7805SR - worthwhile upgrade over standard 7805 or 317?

Other than increased efficiency, would you expect an audible improvement from using a Murata 7805SR (or similar high efficiency switching regulator) in place of a standard 7805?

How would you expect this to perform compared to a properly implemented 317 with adjust cap?

I have a few of the Muratas on the way and will try these in a couple of DACs and Tripath amps. I'd be keen to know if others have had success with these (or not!).
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Old 12th January 2011, 10:02 AM   #2
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Hmm.Those look kind of neat,limited to 500ma (400ma for the 12V version) though.
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Old 12th January 2011, 10:34 AM   #3
djQUAN is offline djQUAN  Philippines
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this might be a problem in some applications:
8. Dropout Voltage: 78SR series regulators described in this data sheet
specify a minimum input voltage at which full-load accuracy and output
regulation are guaranteed (7.5V for 7803SR-C and 7805SR-C, and 15.0V
for 7812SR-C
). However, these devices will stay in regulation at lower
input voltages if they are operated at less than their rated loads.
The following dropout-voltage data, derived from sample testing
performed at an ambient temperature of +25°C with resistive loads,
should be used for information purposes only. For these tests, a unit was
considered to be out of regulation when its output changed by more
+/–0.005Vdc from its nominal value. All voltages were measured directly
at the regulator’s I/O pins.
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Old 12th January 2011, 03:19 PM   #4
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Lots of hf ripple, at frequencies where opamp supply rejection is falling fast.
Nothing is said about magnetic field from the inductor. I don't think such a low profile inductor is going to be well shielded.
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Old 25th April 2011, 02:37 PM   #5
dejanm is offline dejanm  Austria
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Any news about the effect of using Murata instead of 7805 ?
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