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Old 27th January 2013, 01:49 PM   #11
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i am making lm3886 amplifier i got the circuit & pcb file from http://http://www.eeweb.com/project/...lifier-project i made same to same as shown but on the other hand diy audio user's circuit are some different. so i am in confusion, plz help i am beginner in diy. plz check the circuit and pcb file that they are right or wrong.
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Last edited by surya0562; 27th January 2013 at 02:19 PM.
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Old 27th January 2013, 01:54 PM   #12
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i ordered two LM3886TF chip but i found LM3886T chip so i mount them on different Pentium3 heatsink connected with wires. will this trick work? or not. plz comment Click the image to open in full size.
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Last edited by surya0562; 27th January 2013 at 02:22 PM.
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Old 27th January 2013, 10:54 PM   #13
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Be sure a too low resistor will destroy your LM. I almost did that by miscalculating. Luckily the power supply shut down. But don't go below say 4K you should be fine.
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Old 27th January 2013, 11:32 PM   #14
JMFahey is online now JMFahey  Argentina
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I'd always use mica and grease, or what you are "saving" now will later complicate your mounting in a chassis.
And personally don't trust fans very much, prefer "real" heatsinks or at least a vertical aluminum plate, 20cm wide x 10cm high , 2 or 3 mm thick.
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Old 28th January 2013, 04:47 AM   #15
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thanks for your advise, can you check the pcb layout and schematic. I have a doubt something about circuit.
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Old 28th January 2013, 05:05 AM   #16
JMFahey is online now JMFahey  Argentina
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Can't speak for the PCB.
As of the schematic, I can't understand why that RC network is used in feedback instead of a simple 22K resistor.
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