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Old 26th June 2003, 03:32 PM   #11
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is anyone else going to comment? or should i just forget this and just insulate the chips from the heatsink?
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Old 26th June 2003, 03:53 PM   #12
zobsky is offline zobsky  India
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hi,

i belive that insulation using a thin mica insulator was the recommended method on some of the diy-gainclone guides

cheers
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Old 26th June 2003, 04:09 PM   #13
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are using thermal grease on the tabs???....also have you disconnected the -v hook up wires???.....and tell me the heatsinks are isolated from the chassis


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Old 26th June 2003, 05:32 PM   #14
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Quote:
Originally posted by JOE DIRT®
are using thermal grease on the tabs???
yes
Quote:

have you disconnected the -v hook up wires???
no
Quote:

tell me the heatsinks are isolated from the chassis
i havent got a chassis yet, i just tried connecting the heatsinks together
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Old 26th June 2003, 06:47 PM   #15
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maybe the thermal compound is causing enough of a resistance.....also another Q.....is each channel on the same power supply???
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Old 26th June 2003, 06:57 PM   #16
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Quote:
Originally posted by JOE DIRT®
maybe the thermal compound is causing enough of a resistance.....also another Q.....is each channel on the same power supply???

yes

but i want to know why they wont work with the tabs connected.
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Old 26th June 2003, 07:32 PM   #17
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my last kick at the cat Matt...and I may be wrong here...but some manufacturers do connect a power IC substrate to the mating surface and although it is a common connection it wont conduct enough...they refrain you from using a heatsink for a common connection because they know of possible isolation problems
until you tell us some voltage readings and what testing you have have done I`m kinda stuck about your problem as I have not read the data sheet or am familiar with the chip you are using.....but I`m sure one of the audio pro`s here will have a better clue


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Old 26th June 2003, 08:33 PM   #18
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Quote:
Originally posted by JOE DIRT®
my last kick at the cat Matt...and I may be wrong here...but some manufacturers do connect a power IC substrate to the mating surface and although it is a common connection it wont conduct enough...they refrain you from using a heatsink for a common connection because they know of possible isolation problems
until you tell us some voltage readings and what testing you have have done I`m kinda stuck about your problem as I have not read the data sheet or am familiar with the chip you are using.....but I`m sure one of the audio pro`s here will have a better clue


DIRT®

ok, ill read the voltages when i get a chance.
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Old 2nd July 2003, 02:38 PM   #19
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i have mesured the tabs, from ground. they are at 0.3v from ground. not -15v as they should be...
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Old 2nd July 2003, 04:09 PM   #20
tiroth is offline tiroth  United States
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Is the tab voltage 0.3V for both units when disconnected?

You should list the separate disconnected voltages as well as the common connected voltage.
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