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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Posts: 1546
With a capacitor in series an inductor at or near resonance, the core can hover around saturation. If a 60 or 100 watt 120 volt tungsten lamp (ordinary lightbulb) is placed in series with the power source, with careful tuning, (I use a capacitor box with a 5,2,2,1 uf switch), rated at 330 VAC, with another fixed cap in parallel to extend range. a sweet spot is found where the lamp flashes on and off continuously.
The cold lamp drives the resonance peak, the hot lamp causes it to back off the peak. the hot/ cold resistance of a 100 watt lamp is 10:1. Use only oil or paper. Keep your eye on what the lamp is doing for insite of what the b/h curve is doing. The time constant of the flash rate is simply due to lamps taking time to come up to full brightness when powered from a non-stiff power source. (ie limited inrush current)
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The overall system is. It amplifies like a tunnel diode, ie , on the negative resistance curve, (of the lamp). The science is old. Mackay, R.., Stuart:Interesting Non Linear Effects", J. Applied Physics, Vol 24, No.3 March 1953.
The bulb, the capacitor and inductor (primarry of a 120 volt filament transformer will do, (beefy core). one you sinf the C that works best, tweak with variac.
All in all totally useles lamp flasher. I included it in demos for a motors class simply because capacitors in electric power are tricky trouble makers ranging from burning out windings to shearing off hugh motor shafts if switched incorrectly.
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Thermal ferroresonance oscillator.
