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Old 31st March 2009, 09:25 PM   #1
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Default Attempting a Chip Amp Build - Need a PCB!

Hi, I'm looking to build a stereo chip amp to power two 25W rms 4ohm speakers (120W peak). After much searching and self deliberation, I have come to the conclusion that the LM4765 would be the best chip to work around.

I am looking to build the circuit described on the LM4765 page, but I don't want to end up with a breadboard mess. Ideally I would like to construct my own PCB, but due to time constraints I do not currently have access to a CNC mill, nor do I have the resources to acid-etch my own PCBs. Therefore, I would like to purchase a pre-cut board (or kit) suitable for the LM4765.

According to the LM4765 demoboard designs, the chip is compatible with the same PCB designs as the LM1876 and LM4766 as well, however I have been unsuccessful in locating PCBs for these chips too.

Any assistance in locating a PCB (must be available to the UK) or any similar kit which is compatible with the aforementioned speakers preferably in a stereo (not dual mono) configuration would be most appreciated. Thanks!
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Old 1st April 2009, 05:16 AM   #2
sasmit is offline sasmit  India
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you could look at LM1875 ,3875,3886,4780 which are more common, even if you have a little more power than you want it's not going to hurt in fact it's going to be better. You can get pcb's for these chips readily.
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Old 1st April 2009, 05:17 AM   #3
sasmit is offline sasmit  India
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You could also use something like TDA 2040 or TDA 2030 which will be very easy to build even on a piece of prototyping board...and these sound good too although they have been around for a long time now.
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Old 2nd April 2009, 08:32 AM   #4
AndrewT is offline AndrewT  Scotland
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It will be easier to cool two mono chipamps than a two channel chipamp.

If you select the 3886, then aim for 30 to 40W into 4r0 and select a transformer accordingly, about 18+18Vac, 160VA.
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Old 7th April 2009, 12:39 PM   #5
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I have surplus chipamp 3886 PCBs if you want a tried and tested solution.
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Old 27th April 2009, 03:12 PM   #6
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Default Interested in PCBs

Jimbo,

Interested to know what / how many LM3886 PCBs you have, I may need six before too long. Please email me as I can't email you due to still being under moderation. I'm in Bristol most weekends seeing my girlfriend.

TIA,

Dr. Matt...
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Old 27th April 2009, 07:41 PM   #7
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I have more than 6 (10 I think), chipamp.com 3886 dual mono PCB sets. ie each set is 2x ampPCB + 2x power supply PCB.

just like this in fact http://www.chipamp.com/lm3886.shtml

I'm just north of Bristol. Saving the postage is not a great reason to visit me, but you can if you want. And maybe I can sell you some other bits like RCA sockets, or Speaker sockets ?
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Old 2nd July 2009, 04:14 PM   #8
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Default Re: Attempting a Chip Amp Build - Need a PCB!

Quote:
Originally posted by deadparrot
Hi, I'm looking to build a stereo chip amp to power two 25W rms 4ohm speakers (120W peak). After much searching and self deliberation, I have come to the conclusion that the LM4765 would be the best chip to work around.

I am looking to build the circuit described on the LM4765 page, but I don't want to end up with a breadboard mess. Ideally I would like to construct my own PCB, but due to time constraints I do not currently have access to a CNC mill, nor do I have the resources to acid-etch my own PCBs. Therefore, I would like to purchase a pre-cut board (or kit) suitable for the LM4765.

According to the LM4765 demoboard designs, the chip is compatible with the same PCB designs as the LM1876 and LM4766 as well, however I have been unsuccessful in locating PCBs for these chips too.

Any assistance in locating a PCB (must be available to the UK) or any similar kit which is compatible with the aforementioned speakers preferably in a stereo (not dual mono) configuration would be most appreciated. Thanks!

Guys-

I don't think your replies are answering the mail for the Parrot.

Parrot-

See the another post in this forum on pcboards for the LM4765T Chip Amp. I did artwork for several boards, posted them and got alot of feedback on their designs. Haven't done anything with them in a few months, though. Did for both single-bridged mono, dual-bridged Mono, Single-chip stereo, and dual-chip stereo (4ch).

Hope this helps,

Steve
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