GC User tool at Nat Semi - diyAudio
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Chip Amps Amplifiers based on integrated circuits

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Old 6th September 2003, 06:32 PM   #1
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Default GC User tool at Nat Semi

National Semi put up a user tool spreadsheet for the Overture Series chip-amps on their website:
http://www.national.com/appinfo/audi...gn_Guide13.xls

just plug in the variables in the blue cells and NatSemi does the rest.
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Old 6th September 2003, 09:49 PM   #2
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Before the start, it is not bad to read this.

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Old 21st September 2003, 10:50 AM   #3
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After reading the Bridged and Parrallel document over at national that correspondse with this tool I discovered that there seems to be a contradiction between the two. In the document it says that in parrallel mode the formula for R(load) as seen by each IC is (number of IC's)*(speaker load), so a 1ohm speaker is like a 4 ohm load with a 4 IC parrallel circuit, however in the excell sheet you can clearly see above that it is doing (speaker load) / (number of IC's) so a 4 ohm load would be 1 ohm to each IC with previous example.

Which one is right?
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Old 24th September 2003, 05:20 PM   #4
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The right thing is that each amp contributes less if there are many in parallel = the amp sees a lower load (higher impedance)
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