# Circuit: 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 A Table Multivibrator That Produces A Narrow Negative Pulse At Pin 3. The Pulse Turns Q1 On For The Duration Of The Time Period. The Collector Of Ql Is Direct-coupled …

Transcribed Text:Question: Circuit: Battery-powered-high-voltage-generator Circuit Diagra..-

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Circuit:

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 55S timer IC is connected as a
stable multivibrator that produces a narrow negative pulse at pin 3. The pulse turns QI on for the
duration of the time period. The collector of Ql is direct-coupled to tbe base of tbe power transistor
Q2, turing it on during the same time period.

ip

The emitter of Q2 is direct -coupled through current limiting resistor RS = 150 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 TI generates
a very high pulse voltage at its secondary output terminal (labeled X). The pulse frequency is
determined by tbe values of RI, 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 TI.

cis
malfunct
toning
causing
ashort

Ty = Auto lgnon Cot

‘Show transcribed image text

Frequency of oscillation for 555 as astable multivibrator mode is given by
fe 1
© 0.693 * (RI + R2)*C
Where R1=10 kilo ohm
R2=4,7 kilo ohm

C= 0.47 uF

f 1

~ 0,693 * (10000 + 4700) * 0.00000047
f = 208.85H2

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