is LM1875 replacement for TDA2030(A)

drmr_bg · 6th August 2004, 10:22 PM

first, i want to excuse for my english, 'cause i don't use it very much

i have amplifier circuit schematic which uses TDA2030 as a driver stage for a pair of power transistors (BD249/250)
cause TDA2030 has worse PSRR than LM1875, and they otherwise look alike, i think to use National's chip

anybody can see a problem with that?

P.S. currently i can't give the schematic, but if you need it i'll find a way to scan it.

mcolliva · 9th August 2004, 02:52 PM

Originally posted by drmr_bg [/i]
[B]first, i want to excuse for my english, 'cause i don't use it very much

i have amplifier circuit schematic which uses TDA2030 as a driver stage for a pair of power transistors (BD249/250)
cause TDA2030 has worse PSRR than LM1875, and they otherwise look alike, i think to use National's chip

anybody can see a problem with that?

Hello!
I think that there is no problem!
Values of resistors in feedback are same as LM1875..
I replace power board of an old Cambridge Amp and LM1875 sound really good...
Have a nice day..

MArco

palesha · 10th August 2004, 11:44 AM

Yes,
It is better by all parameters. Even sound better & more output.
Mahendra Palesha

livenicely · 18th November 2009, 10:45 AM

i have tda2030a in my 2.1 channel computer speakers. Can i change tha tda2030a with lm1875 or it can cause problem

formula 22 · 16th January 2012, 06:14 AM

Hello!
If you can schematic amplifier with tda2030 and an BD249/BD250.
thank you

suntechnik · 16th January 2012, 08:07 AM

Not exactly BD but LM1875+2SA1943/2SC5200 instead
DIY Audio Power Amplifier LM1875 bridge 2SA1943 2SC5200 100 Watt with Circuit Diagram and PCB Layout | Technology News and Review

I can highly recommend using LM instead of TDA, US ICs are the best.

geraldfryjr · 16th January 2012, 09:24 AM

That is a very interesting circuit!!

jer

geraldfryjr · 16th January 2012, 10:16 AM

I wonder how it would work with 2 pair of output devices or even 4 pair or more.

jer

johnr66 · 16th January 2012, 02:51 PM

Quote:

Originally Posted by suntechnik

Not exactly BD but LM1875+2SA1943/2SC5200 instead
DIY Audio Power Amplifier LM1875 bridge 2SA1943 2SC5200 100 Watt with Circuit Diagram and PCB Layout | Technology News and Review

I can highly recommend using LM instead of TDA, US ICs are the best.

100 watts into 8 ohms with 25 volt rails. That just ain't going to happen.

suntechnik · 16th January 2012, 10:45 PM

Quote:

Originally Posted by geraldfryjr

I wonder how it would work with 2 pair of output devices or even 4 pair or more.

jer

You might better search other schematics in that case
LME49810 ThermalTrak

Another project (LME49811 is a half of LM4702) with lateral FETs:

LM4702 with 2SK1058 2SJ162 MOSFET Hi-Fi Amplifier 300 Watt Circuit and PCB Layout | Electronic Home Entertainment

LME49830 designed to drive multiply MOSFETS.

6th August 2004, 10:22 PM	#1
drmr_bg diyAudio Member Join Date: Jun 2004 Location: vratsa	is LM1875 replacement for TDA2030(A) first, i want to excuse for my english, 'cause i don't use it very much i have amplifier circuit schematic which uses TDA2030 as a driver stage for a pair of power transistors (BD249/250) cause TDA2030 has worse PSRR than LM1875, and they otherwise look alike, i think to use National's chip anybody can see a problem with that? P.S. currently i can't give the schematic, but if you need it i'll find a way to scan it.

9th August 2004, 02:52 PM	#2
mcolliva diyAudio Member Join Date: May 2004 Location: turin	Re: is LM1875 replacement for TDA2030(A) Originally posted by drmr_bg [/i] [B]first, i want to excuse for my english, 'cause i don't use it very much i have amplifier circuit schematic which uses TDA2030 as a driver stage for a pair of power transistors (BD249/250) cause TDA2030 has worse PSRR than LM1875, and they otherwise look alike, i think to use National's chip anybody can see a problem with that? Hello! I think that there is no problem! Values of resistors in feedback are same as LM1875.. I replace power board of an old Cambridge Amp and LM1875 sound really good... Have a nice day.. MArco

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10th August 2004, 11:44 AM	#3
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	Yes, It is better by all parameters. Even sound better & more output. Mahendra Palesha

18th November 2009, 10:45 AM	#4
livenicely diyAudio Member Join Date: Nov 2009	i have tda2030a in my 2.1 channel computer speakers. Can i change tha tda2030a with lm1875 or it can cause problem

16th January 2012, 06:14 AM	#5
formula 22 diyAudio Member Join Date: Sep 2011 Location: El Triunfo	Hello! If you can schematic amplifier with tda2030 and an BD249/BD250. thank you

16th January 2012, 08:07 AM	#6
suntechnik diyAudio Member Join Date: Jun 2010 Location: St. Petersburg	Not exactly BD but LM1875+2SA1943/2SC5200 instead DIY Audio Power Amplifier LM1875 bridge 2SA1943 2SC5200 100 Watt with Circuit Diagram and PCB Layout \| Technology News and Review I can highly recommend using LM instead of TDA, US ICs are the best.

16th January 2012, 09:24 AM	#7
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	That is a very interesting circuit!! jer

16th January 2012, 10:16 AM	#8
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	I wonder how it would work with 2 pair of output devices or even 4 pair or more. jer

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