I wouldn't believe Tantalums. If the equipment, with the tantalums, is kept idle(OFF) for some months, a tantalum is sure to get shorted at power on. I have seen this in very high reputation manufacturers' products.
I have tried new old stock tantalums(bead) kept for years. Each and every capacitor got shorted just by connecting to a dc supply. No matter how I tried to charge them, even by slowly increasing the voltage w current limit, each and every Tant go shorted. By the way they were 35 volts rated and I hardly went upto 10 volts.
Enjoy
Gajanan Phadte
I have tried new old stock tantalums(bead) kept for years. Each and every capacitor got shorted just by connecting to a dc supply. No matter how I tried to charge them, even by slowly increasing the voltage w current limit, each and every Tant go shorted. By the way they were 35 volts rated and I hardly went upto 10 volts.
Enjoy
Gajanan Phadte
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C101 if shorted will also create this problem.
You have only seven transistors to pull out and test.
Also make sure that none of the power transistors r shorting to the heatsink
Gajanan Phadte
You have only seven transistors to pull out and test.
Also make sure that none of the power transistors r shorting to the heatsink
Gajanan Phadte
I don't see the point of them really, just a more expensive way to do a simple job. They don't make as much mess when they blow, but they do take fuses out, where as Electrolytics tend not to....just a smell and some smoke but things carry on more or less as usual. Sometimes with a bit of Hum.......
I find this totally and utterly inexplicable and beyond my belief. As I've said, we use millions of them a year and the failure rate is comparable to other types (when correct design rules are applied).
I have used tantalums from surplus stock for repairs that are at least a decade old (but unused). Never ever ever had any problems whatsoever with them.
The only way I could explain the above is that the markings on a tantalum were mistaken for the - like with electrlytics. Tantalums have the + marked.
Or the stock was incorrectly marked, in which case they should not have made it to the distributors.
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I reckon they should be marked "Beware! Tantalum...use at own risk!"
Or "Letvel! heirdie capacitor is Kak!" : )
Or "Letvel! heirdie capacitor is Kak!" : )
One of my senior had a geochronology instrument at work. The instrument was of modular construction and had a bin with a power supply and u could insert the modules required for the analysis. He would put all the modules in the bin even if not required so as to prevent tantalums from catching fire.
Recent past, our echosounder had a burnt shorted tant due to which series resistor of 10 ohms went open.
Sorry, that's the truth for/from me.
Gajanan Phadte
Recent past, our echosounder had a burnt shorted tant due to which series resistor of 10 ohms went open.
Sorry, that's the truth for/from me.
Gajanan Phadte
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