[Prev][Next][Index][Thread]

Re: beer bottle cap question


> What's the easiest/cheapest way to measure the capacitance and voltage
> ratings of my beer bottle caps?

1. - Use a cheap or expensive DMM that has capacitance measurement. ;o)
   - use a signal generator and a oscilloscope to measure how much
     the signal is damped, then calculate the capacitance
   - make an estimate, 1 bottle = 800pF
   - connect the bottle caps to a selfmade LC oscillator, measure
     frequency, then calculate capacitance

2. - Hook up one bottle to your primary, slowly turn up the voltage on the
mains side of your transformer (with variac, high-power potentiometer,
etc), and check setting before corona starts to form. Then measure input
voltage, mutliply by tranformer ratio, halfe the value. Done. ;o)


  Jan