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Old 2nd July 2005, 10:30 PM   #11
mzzj is offline mzzj  Finland
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Originally posted by jamesbooi
- yes i use 50V 47uF tamtalum capacitor. At first, i have a 3A fuse attach in the circuit before the voltage pass through the 47uF capacitor, when i turn on the power, the fuse blow! And then i bypass the fuse, turn on the power again, and this time the 47uF capacitor blow!

Tantal caps have bad habit to go dead-short and if availlable current is big enough they explode. They dont like heat, overvoltage(spikes?!) and especially not reverse-polarity. Ripple-current handling capacity varies wildly depending on manufacturer and series. Try something like 470uF 50v al-electrolytic + 100nF ceramics.
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Old 9th July 2005, 06:52 AM   #12
Kenshin is offline Kenshin  China
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Some SMD tantalums have a line near the + terminal.
Different from SMD diods, which the line always appear near the -

Originally posted by Eva
Tantalum capacitors are polarized. Are you sure that you are not connecting them backwards? They usually have a small '+' sign printed near the positive leg.
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