Any safety issues with shocking kids?
The display uses an adjustable, regulated low voltage power supply (ranging from 1 to 12 volts at up to 1.5 amperes), which powers an emitter follower connected to the primary of a transformer made by eight turns on a 5 mH ferrite core inductor. The secondary of the transformer is tuned to about 220 kHz by a capacitative divider which provides positive feedback to the transistor base. A half wave voltage doubler then yields DC outputs between 100 volts and 1200 volts at less than one milliampere
They are creating a switching DC/DC converter that boosts an input voltage from 1-12V up to 100-1200V.
The secondary of the transformer is tuned to about 220 kHz by a capacitative divider which provides positive feedback to the transistor base
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