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Old 17th December 2009, 07:35 PM   #11
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It's best to isolate LM4780 chip from metal heatsink and simply ground the heatsink.

All exposed metal parts should be connected to Earth ground. I separate audio grounds from Earth ground with 10R resistor.
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Old 17th December 2009, 10:29 PM   #12
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ahh so is the strip of film to isolate chip from heatsink... lol I know you hate me but I promise no questions when I do MkII.

Still got transformer to get yet, so i'm sure i'll be back for more...sorry!
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Old 17th December 2009, 11:15 PM   #13
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Yes, that's exactly what it's for
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Old 20th December 2009, 06:08 PM   #14
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Do i have to solder every pin on the chip.. At the moment I have just soldered the ends to hold it in place. It is secure, but I'm not sure if it will connect without solder.
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Old 20th December 2009, 06:10 PM   #15
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Yes, you need to solder all pins.
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Old 20th December 2009, 06:12 PM   #16
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wow fast reply... somehow i had a feeling that was gonna be the answer. thank you
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Old 20th December 2009, 06:19 PM   #17
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Some pins are not connected (NC in a picture), and those are not really need to be soldered. But make sure that all the other are soldered.
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Old 21st December 2009, 08:59 AM   #18
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I am thinking of using the box AB15 here.. Aluminium Boxes : Instrument Cases : Maplin for the case..

If i fasten lm chip to the base would this be enough to act as heatsink or will it need more?

I intend to put feet on so it will have a gap to breath.
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Old 23rd December 2009, 04:26 PM   #19
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You guys must have some eyesight... I did 5 pins on the chip and my eyes went blurry... Try another 5 later I guess. I tried a magnifier but that made me go blurry without doing anything lol.
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Old 23rd December 2009, 05:31 PM   #20
tresch is offline tresch  United States
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Quote:
Originally Posted by littlerick View Post
You guys must have some eyesight... I did 5 pins on the chip and my eyes went blurry... Try another 5 later I guess. I tried a magnifier but that made me go blurry without doing anything lol.
Sounds like it's time for a trip to the eye doctor for you!
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