Hi,
After a recent trade I have gotten some 230000uF, 25V caps. When they arrived, I checked their voltages present. They were all around 1.5V to 2.0V. I discharged them with a 1R 5W resistor, and they discharged immediatly. However, whilst I sat there, I noticed them GAINING charge! They were going at about 5mV per second. I thought they may have been "stealing" charge from the multimeter but I took the multimeter off at 20mV and when I checked again, it was at 32mV!
Is this normal & what is it?!
Thanks,
Gaz
After a recent trade I have gotten some 230000uF, 25V caps. When they arrived, I checked their voltages present. They were all around 1.5V to 2.0V. I discharged them with a 1R 5W resistor, and they discharged immediatly. However, whilst I sat there, I noticed them GAINING charge! They were going at about 5mV per second. I thought they may have been "stealing" charge from the multimeter but I took the multimeter off at 20mV and when I checked again, it was at 32mV!
Is this normal & what is it?!
Thanks,
Gaz
Hi,
Memory...caps are pretty smart buggers...not that that helps us audio folk in any way.
See why using those as coupling caps isn't such a great idea?
Cheers,
Is this normal & what is it?!
Memory...caps are pretty smart buggers...not that that helps us audio folk in any way.
See why using those as coupling caps isn't such a great idea?
Cheers,
Hi,
It's a classic case of dielectric absorption. Here's an article that discusses it:
http://www.national.com/rap/Application/0,1570,28,00.html
It's a classic case of dielectric absorption. Here's an article that discusses it:
http://www.national.com/rap/Application/0,1570,28,00.html
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