lm1875 fizzing away probelm - Page 10 - diyAudio
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View Poll Results: Was a good idea to use two lm1875 or a big stk chip
Use stk 8 27.59%
use lm1875 21 72.41%
Voters: 29. You may not vote on this poll

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Old 10th January 2013, 07:58 PM   #91
blu_glo is offline blu_glo  England
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Quote:
Originally Posted by PetruV View Post
One last question,what does gainclone mean?,sorry for sounding like a noob
"gainclone" = a silicon chip amplifier with minimal components like you've been building here. Some people really minimise and take out safety and other components but I thgink unless you really have the time and test equipment you should stick to the basic datasheet application circuits. The manufactureres do know how to set them up - after all they invented them!!
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Old 10th January 2013, 08:05 PM   #92
blu_glo is offline blu_glo  England
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Originally Posted by PetruV View Post
Alda avd890d,i have it for a long time
I can't find that particular one on google but I assume its like some others I did find, general purpose digital multimeter?

Have you checked you haven't blown any of the fuses in it?
Quite easily done if you measure voltage with it set for current - says he from experience - especially if you got a big spark from it in the past....
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Old 10th January 2013, 08:11 PM   #93
PetruV is offline PetruV  Romania
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Originally Posted by blu_glo View Post
I can't find that particular one on google but I assume its like some others I did find, general purpose digital multimeter?

Have you checked you haven't blown any of the fuses in it?
Quite easily done if you measure voltage with it set for current - says he from experience - especially if you got a big spark from it in the past....
It sometime not makes good contact but it is generaly good if i dont hold it near magnets and digital devices
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Old 10th January 2013, 08:15 PM   #94
blu_glo is offline blu_glo  England
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Originally Posted by PetruV View Post
It sometime not makes good contact but it is generaly good if i dont hold it near magnets and digital devices
Yeh. Get the leads replaced as they're no good faulty and a shame to waste a perfectly good multimeter for the sake of $2 leads.....
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Old 10th January 2013, 08:38 PM   #95
PetruV is offline PetruV  Romania
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Originally Posted by blu_glo View Post
Yeh. Get the leads replaced as they're no good faulty and a shame to waste a perfectly good multimeter for the sake of $2 leads.....
Theyre from another multimeter since i lost the original
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Old 11th January 2013, 12:53 AM   #96
zymurgn is offline zymurgn  United States
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I couldn't tell from the pictures but make sure you don't ground that heatsink. The LM1875 is usually supposed to be insulated from the heatsink anyway. Mine has a thermal pad, as well as a screw insulator.
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Old 11th January 2013, 06:06 AM   #97
blu_glo is offline blu_glo  England
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Thats a good point, I did see PetruV mention he got some tab insulators, but he did not mention any screw isolators.....
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Old 11th January 2013, 08:03 AM   #98
PetruV is offline PetruV  Romania
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Originally Posted by blu_glo View Post
Thats a good point, I did see PetruV mention he got some tab insulators, but he did not mention any screw isolators.....
I have both but i dont think theyre neede in this small heatsink but in the finaldesign with the transformer and big heatsink i will use the mica insulators
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Old 11th January 2013, 08:04 AM   #99
PetruV is offline PetruV  Romania
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Now im working on the psu which has to include 2 15v regulators for the previous opamp preamp that amp had
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Old 11th January 2013, 10:46 AM   #100
PetruV is offline PetruV  Romania
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wil the lm need mica isulators even if the heatsink does not touch the casing and there are 2 chips on the heatsink
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