Name some amp chips that work on a single rail voltage please

[speaker]

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?

 

[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.

 

[speaker]

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?

 

[richie00boy]

They still make the chips.

 

[paulb]

National Semiconductor has a bunch designed specifically for +12V single rail.
e.g. LM4940.

 

[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. 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).

 

[richie00boy]

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

 

[Minion]

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....

 

[ionomolo]

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

 

[BWRX]

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.

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.

 

[Conrad Hoffman]

As long as you ac couple the input and output, and provide a V/2 bias, any chip will work single supply. You just have to meet the minimums as stated above- study the data sheet and remember that the chip has no idea where ground is, only the voltage differences between the pins.

 

[puginfo]

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

not really. if you are familiar with telco equip typed smps, they out put 48Vdc. some are 60 Vdc. these will have to be tamed down to the voltage you require with a suitable pass transistor regulator cct.

not too sure of these smps suitability with GC ccts thou.

 

[MJL21193]

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

P=peakVrms^2/R
P=(6 x .707)^2/4
P=17.99/4
P=4.498 watts

 

[EWorkshop1708]

Here's a chip : HA13158A 12V Car Radio IC

I just desoldered it from a broken JVC car stereo cassette.

Specs say 34W x 4 @ 13.2V or 16W RMS
or 40W x 4 @ 14.4V

I'll be using it for a battery-powered portable sound system with 14.4V of NiCd Cells. Should beat any portable boombox in SQ and Power Output.

*If you want good power and easy hookup from single 12V, go with BTL Car Radio IC chips. BTL makes it so you don't need coupling capacitors for the speakers, and most power possible from 12V or so.