A one farad capacitor can provide a certain bounce back after discharge from dielectric absorption. This can be many tens or hundreds of Joules, depending on the capacitor size, type, etc. Dimly lighting high intensity white led's can be accomplished with microamperes of current. I suggest that his oscillator may be operating in a dual mode at reduced voltage and current, which allows the dielectric absorption effect to recover. When an oscillator is in current starved mode it may exhibit a noticeable hysteresis, turning fully off and drawing next to no current, then turning back on at some higher value of voltage or current. During the "off time", the dipoles in the large capacitor release more charge to the foils until the oscillator turns on again. If the oscillator is a micropower type, the voltage on the capacitor can actually be seen rising while the oscillator continues to run. This effect misleads many FE researchers. http://en.wikipedia.org/wiki/Dielectric_absorptionhttp://electronicdesign.com/article/analog-and-mixed-signal/what-s-all-this-soakage-stuff-anyhow-6096
« Last Edit: 2012-11-12, 22:26:47 by ION »
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