Battery-powered-high-voltage-generator Circuit Diagram . Output voltage great enough to jump a l-inch gap can be obtained
from a 12-V power source. A 555 timer IC is connected as an astable
multivibrator that produces a narrow negative pulse at pin 3. The pulse
turns Ql on for the duration of the time period. The collector of Ql is
direct-coupled to tbe base of tbe power transistor Q2, turning it on
during the same time period.
The emitter of Q2 is direct -coupled through current limiting
resistor R5 to the base of the power transistor. Q3 switches on,
producing a minimum resistance between the collector and emitter. The
high-current pulse going through tbe primary of high-voltage
transformer Tl generates a very high pulse voltage at its secondary
output terminal (labeled X). The pulse frequency is determined by tbe
values of Rl, R2, and C2. The values given in the parts list were
chosen to give the best possible performance when an auto-ignition coil
is used for Tl.
Battery-powered-high-voltage-generator Circuit Diagram
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