On Tue, 2009-05-05 at 08:29 -0600, Robin Laing wrote:
Another issue is using capacitors that are close to the operating
voltage of the system. 12V and use 15V capacitors. This doesn't give
any overhead for voltage spikes or surges caused by charging and
discharging circuits.
For electrolytic capacitors, they're only close to their capacitance
when run close to their working voltage. e.g. A 10 microfarad 100 volt
capacitor doesn't behave as a 10 microfarad capacitor if you run it at
12 volts. Circuitry should protect against spikes/surges with crowbar
circuitry to clamp them down. Though, I really wouldn't expect to see a
big spike in a 12 volt circuitry, unless it was a switchmode power
supply.
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