Finally made a LM1875 amp - Page 9

androuski · 31st August 2009, 06:32 PM

Going from stereo intégrated amp to monoblocks is a first step ; second step is biamping and the third one is active crossover...

N-Brock · 21st October 2009, 03:02 AM

Any word on pot values yet?
I just read thru and didn't find anything.

Thanks

Moon_Walker · 8th January 2010, 09:31 AM

Hi,

i purchased this kit last year and unfortunately did not received the shematic as it have to be happen.

Could you please send me the shematic of the pcbs for further reference.

Many thanks
br
Attila

Moon_Walker · 18th January 2010, 01:09 PM

?

ppcblaster · 2nd May 2010, 05:20 PM

Quote:

Originally Posted by pacificblue

You can use a 2 x 20 V transformer, if your speakers are 8 Ohm and you use the TA package and you have an adequate heatsink.

With 2 x 20 V and 4 Ohm speakers you will run into thermal shutdown.

What is the "TA Package"?

pacificblue · 2nd May 2010, 08:29 PM

The TA-package has a non-isolated (metal) heatsink tab that is connected to the negative power pin.
The TF-package has an isolated (plastic) heatsink tab. Improved electrical isolation with the drawback of higher thermal resistance.

ppcblaster · 25th May 2010, 03:08 PM

what psu capacitors are used?

I need part numbers please.

BrianGT · 25th May 2010, 03:23 PM

1500uF Panasonic FC
Digikey Part Number: P10334-ND

androuski · 25th May 2010, 03:48 PM

Hello,
my LM1875 chipamp kit - a stereo integrated am with alps pot and a 160va 2x18v transformer, and the 2x1500µf stock cap on psu board - produce a strong plock when I turn it off ; any input about this trouble ? I solder on the snubber parts, which is not necessary with the 2x1500µf configuration, is this the cause of my problem ?

AndrewT · 25th May 2010, 03:53 PM

I don't think the 1875 has a mute function.

You might have to fit a relay switched output to the speaker terminals.
This can double up as an delayed switch on to give time for the other parts in the system to reach a quiet state and can also be used as a speaker protection relay in the unlikely event of speaker damaging faults developing.

2nd May 2010, 08:29 PM	#86
pacificblue diyAudio Member Join Date: May 2008	The TA-package has a non-isolated (metal) heatsink tab that is connected to the negative power pin. The TF-package has an isolated (plastic) heatsink tab. Improved electrical isolation with the drawback of higher thermal resistance. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

25th May 2010, 03:53 PM	#90
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I don't think the 1875 has a mute function. You might have to fit a relay switched output to the speaker terminals. This can double up as an delayed switch on to give time for the other parts in the system to reach a quiet state and can also be used as a speaker protection relay in the unlikely event of speaker damaging faults developing. __________________ regards Andrew T.

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31st August 2009, 06:32 PM	#81
androuski diyAudio Member Join Date: Jan 2008	Going from stereo intégrated amp to monoblocks is a first step ; second step is biamping and the third one is active crossover...

21st October 2009, 03:02 AM	#82
N-Brock diyAudio Member Join Date: Oct 2007 Location: Cambridge, MA	Any word on pot values yet? I just read thru and didn't find anything. Thanks

8th January 2010, 09:31 AM	#83
Moon_Walker diyAudio Member Join Date: Sep 2009	Hi, i purchased this kit last year and unfortunately did not received the shematic as it have to be happen. Could you please send me the shematic of the pcbs for further reference. Many thanks br Attila

18th January 2010, 01:09 PM	#84
Moon_Walker diyAudio Member Join Date: Sep 2009	?

25th May 2010, 03:08 PM	#87
ppcblaster diyAudio Member Join Date: Jul 2006	what psu capacitors are used? I need part numbers please.

25th May 2010, 03:23 PM	#88
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	1500uF Panasonic FC Digikey Part Number: P10334-ND

25th May 2010, 03:48 PM	#89
androuski diyAudio Member Join Date: Jan 2008	Hello, my LM1875 chipamp kit - a stereo integrated am with alps pot and a 160va 2x18v transformer, and the 2x1500µf stock cap on psu board - produce a strong plock when I turn it off ; any input about this trouble ? I solder on the snubber parts, which is not necessary with the 2x1500µf configuration, is this the cause of my problem ?

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