LM1875 and 16V-0-16V trafo

maurycy · 29th January 2010, 03:13 PM

I am looking to put together small speaker/headphone amplifier. Unfortunately, I can't use TA2024 as it is bridged so I am looking at LM1875. There are kits available from China that require 2x12-18V. Now, my knowledge about circuits is limited so please let me know if I could use 16V-0-16V toroidal transformer to power this board.

There is also kit from ChipAmp but it does not have instructions posted yet. I have built LM3875 from ChipAmp before and for CT trafo I needed to modify the PSU board. Without instructions, I will have to most likely get the one from China.

Thanks.

pikkujöpö · 29th January 2010, 05:45 PM

Hi

By looking the pictures it is suitable for center tapped transformer also.As it apparently has 3 connectors for AC/GND/AC.

When deciding between "known" kits as ones from Chipamp or kits found from ebay,be aware of the possible fake chips and components.I'm not in any means saying this kit has fake components but some may have.

pacificblue · 29th January 2010, 06:36 PM

It says 2 x 12-18 V AC. 2 x 16 V AC seems to qualify.

There is an entire thread about the chipamp.com kit, which is probably as detailed as any instructions can ever be.

maurycy · 29th January 2010, 11:36 PM

Thanks for replies.

Arend · 30th January 2010, 10:22 AM

LM1875 requires 16-60v (datasheet)

2x16v ac wil give you 2x22,4 v dc --> 44,8v total

So yes, your transformer will be OK if it can deliver enough power. But a LM1875 IC seems overkill for a headphoneamp to me.

maurycy · 30th January 2010, 02:47 PM

I chose LM1875 because I may need to drive small pair of speakers when not using headphones. They would be about 10-15W each. Do you have another recommendation?

Arend · 31st January 2010, 08:17 AM

-chip with less power (may require other transformer)
-separate amplifier for headphone

29th January 2010, 03:13 PM	#1
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	LM1875 and 16V-0-16V trafo I am looking to put together small speaker/headphone amplifier. Unfortunately, I can't use TA2024 as it is bridged so I am looking at LM1875. There are kits available from China that require 2x12-18V. Now, my knowledge about circuits is limited so please let me know if I could use 16V-0-16V toroidal transformer to power this board. There is also kit from ChipAmp but it does not have instructions posted yet. I have built LM3875 from ChipAmp before and for CT trafo I needed to modify the PSU board. Without instructions, I will have to most likely get the one from China. Thanks.

29th January 2010, 05:45 PM	#2
pikkujöpö diyAudio Member Join Date: Mar 2005 Location: Portugal	Hi By looking the pictures it is suitable for center tapped transformer also.As it apparently has 3 connectors for AC/GND/AC. When deciding between "known" kits as ones from Chipamp or kits found from ebay,be aware of the possible fake chips and components.I'm not in any means saying this kit has fake components but some may have. __________________ xxx I should correct my spelling xxx

29th January 2010, 06:36 PM	#3
pacificblue diyAudio Member Join Date: May 2008	It says 2 x 12-18 V AC. 2 x 16 V AC seems to qualify. There is an entire thread about the chipamp.com kit, which is probably as detailed as any instructions can ever be. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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29th January 2010, 11:36 PM	#4
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	Thanks for replies.

30th January 2010, 10:22 AM	#5
Arend diyAudio Member Join Date: Feb 2008	LM1875 requires 16-60v (datasheet) 2x16v ac wil give you 2x22,4 v dc --> 44,8v total So yes, your transformer will be OK if it can deliver enough power. But a LM1875 IC seems overkill for a headphoneamp to me.

30th January 2010, 02:47 PM	#6
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	I chose LM1875 because I may need to drive small pair of speakers when not using headphones. They would be about 10-15W each. Do you have another recommendation?

31st January 2010, 08:17 AM	#7
Arend diyAudio Member Join Date: Feb 2008	-chip with less power (may require other transformer) -separate amplifier for headphone

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