Basic HTML Version
Special (General Purpose) Solenoid Circuit
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Power Driver Board
Drive
VCC
F/ashlamp·
Power
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The microprocessor toggles the output of the 74LS374. When point "A" drops low, point "8" is high. A high at point "8"
causes a low at point "G". When point "G" is low the coiVflashlamp is grounded through the transistor and the coiVflashlamp
turns On. When point "A" toggles high the coillflashlamp turns Off.
• Tieback Diode is not used for flashlamp circuit.
General Illumination Circuit
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Power Driver Board
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G.I. LIghts
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S.B
J115
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Power
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Playfield
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Backbox.
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Power
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Up to 18 bUlb,.
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Driver
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Board
(Power Driver Board)
6.3 voll secondary
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Zero Cross Detection
Circuit
5 volt secondary
When point "A" toggles low, then points "8" and "G" are high. This turns On the triac and the desired General Illumination
string lights.
DOCTORWHO 3-7