chipamp LM1875 anyone built them?

Sparky OR · 10th August 2008, 04:48 AM

Hi
I'm in the process of slowly assembling the stereo kit from Brian Bell.
Anyone else put them together yet? Debating things like putting zobel R & C on speaker terminals instead of PCB...thoughts? Also the kit contains a 22uF bipolar cap at C2, is this AC coupling for feedback resistors? Goes to gnd and R3 (1k or 680 ohm in my case).
thanks

planet10 · 10th August 2008, 07:13 AM

I haven't gotten mine yet... as soon as i do, one set is going to replace the sat amps in a Keiga 2,1 plate amp.

dave

lineup · 21st August 2008, 03:59 PM

Quote:

Originally posted by Sparky OR
Hi
I'm in the process of slowly assembling the stereo kit from Brian Bell.
Anyone else put them together yet? Debating things like putting zobel R & C on speaker terminals instead of PCB...thoughts? Also the kit contains a 22uF bipolar cap at C2, is this AC coupling for feedback resistors? Goes to gnd and R3 (1k or 680 ohm in my case).
thanks

About LM1875 .. vs. LM3875/LM3886 and more powerful chips.
I would always go for LM1875 .. before LM3875/3886
in the case I need some moderate wattage power.

And this is most any case with speakers of normal sensitivity and for normal living rooms at normal listening levels.
Especially for our normal consumer 8 Ohm speakers

Reason?
Well, it has to do with this rule

Quote:

We should NOT use more force
than is necessary to handle the situation at hand.

This is what Police Force have to consider in their work.
This is what a good forum Moderator lives by.
And this is also a pretty good general rule for any man.
We do not need to take our car, for doing some household shopping in the food shop on the corner.
We can take a walk or ride our bike.

LM1875 is a real hi-fi & musical chip amplifier.
Compared to many other in the same price range.
And even compred to several more expensive chips.
You can not go very wrong, if go for LM1875
using kit from BrianGT chip amps website or some other LM1875 circuit.

Regards

Lineup
Lineup audio lab

amt · 21st August 2008, 04:37 PM

Hiya Sparky,

Ive just built Brians 3886 for a friend and am in the process of chassis
fab. If you need any help, send me a PM or email me. Im over in the South Hills area BTW.

ampbox/at/comcast/dot/net

amt

10th August 2008, 04:48 AM	#1
Sparky OR diyAudio Member Join Date: Jun 2003 Location: Eugene, Oregon	chipamp LM1875 anyone built them? Hi I'm in the process of slowly assembling the stereo kit from Brian Bell. Anyone else put them together yet? Debating things like putting zobel R & C on speaker terminals instead of PCB...thoughts? Also the kit contains a 22uF bipolar cap at C2, is this AC coupling for feedback resistors? Goes to gnd and R3 (1k or 680 ohm in my case). thanks __________________ Wish I'd studied this stuff with as much interest 30 years ago!

10th August 2008, 07:13 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I haven't gotten mine yet... as soon as i do, one set is going to replace the sat amps in a Keiga 2,1 plate amp. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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21st August 2008, 04:37 PM	#4
amt diyAudio Member Join Date: Feb 2003 Location: oregon	Hiya Sparky, Ive just built Brians 3886 for a friend and am in the process of chassis fab. If you need any help, send me a PM or email me. Im over in the South Hills area BTW. ampbox/at/comcast/dot/net amt

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