Name some amp chips that work on a single rail voltage please - diyAudio
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Old 8th February 2008, 12:51 PM   #1
speaker is offline speaker  United States
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Default Name some amp chips that work on a single rail voltage please

I am having trouble searching out which amp chips will work off a single rail voltage. I want to build something that will run off 12VDC minimum.

Can anyone point me in the direction of something?
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Old 8th February 2008, 01:43 PM   #2
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Any will with some slight changes to the schematic, as long as you meet the min voltage criteria in the datasheet.

Try TDA2030 and LM1875 for starters. In fact I'm pretty sure both of those even show single rail application on the datasheets.
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Old 8th February 2008, 05:57 PM   #3
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Quote:
Originally posted by richie00boy
Any will with some slight changes to the schematic, as long as you meet the min voltage criteria in the datasheet.

Try TDA2030 and LM1875 for starters. In fact I'm pretty sure both of those even show single rail application on the datasheets.
Thank you very much!

One question though, are these still current?

In other words, are they still referenced for new designs?
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Old 8th February 2008, 06:12 PM   #4
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They still make the chips.
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Old 8th February 2008, 06:25 PM   #5
paulb is offline paulb  Canada
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National Semiconductor has a bunch designed specifically for +12V single rail.
e.g. LM4940.
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Old 10th February 2008, 01:34 AM   #6
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TDA7265 in bridge mode, can make one heck of a lot of power on 12v. I use one several times per week. . . because it came inside the car radio. Well, that one isn't bridged, so its only 20w per ch. Its loud enough and its got that "big room filling sound" (car filling sound?).

What's the application. . . Or, what's the power source? Is it computer at 11.4v or is it automotive at 13.5v?

Or did you want to jam out with only a "wall plug" as the power source (that would be a Tripath chip btw).
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Old 10th February 2008, 06:08 PM   #7
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Quote:
Originally posted by danielwritesbac
TDA7265 in bridge mode, can make one heck of a lot of power on 12v. I use one several times per week. . . because it came inside the car radio. Well, that one isn't bridged, so its only 20w per ch.
Actually a theoretical absolute maximum of 9 watts RMS with a 4 ohm load and 12 volt supply
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Old 10th February 2008, 06:42 PM   #8
Minion is offline Minion  Canada
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The LM3886 Datasheet also has a schematic on how to set it up for Single Rail operation....i believe it just uses a cou[ple extra caps and resistors and a 2n3904 NPN Transistor and a Big output cap...shouldn"t much harder to implement that a regular Gainclone....
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Old 10th February 2008, 07:07 PM   #9
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The LM3886 needs a lot of voltage, 36 V min in single supply operation as stated in the datasheet. If you have that voltage that's no problem, but I can't imagine a situation where you can get 40Vdc and not +/-18
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Old 10th February 2008, 11:08 PM   #10
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Quote:
Originally posted by danielwritesbac
TDA7265 in bridge mode, can make one heck of a lot of power on 12v.

Well, that one isn't bridged, so its only 20w per ch.
Quote:
Originally posted by richie00boy
Actually a theoretical absolute maximum of 9 watts RMS with a 4 ohm load and 12 volt supply

Theoretically, 4.5Wrms single ended or 18Wrms bridged into a 4ohm load with a 12V supply.
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