Page 117 - Road Show

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FLASH LAMP

CIRCUIT

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:FLASH LAMP

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Red-White

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The microprocessor toggles the output of the 74LS374. When point "A" is low, point "8" the collector of

the 2N5401 transistor, is high. Once point "8" is high, point "G" the collector of the TIP1 02 transistor is

low. When point "G" is low, the flash lamp is grounded through the transistor and turns on. When point

"An toggles high, the current shuts off.

SPECIAL (GENERAL PURPOSE) SOLENOID CIRCUIT

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POWER -DRIVER BOARD - - - - - - - -

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FLASHLAMP

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Red-White

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The microprocessor toggles the output of the 74LS374. When point "A" is low, point "8" the collector of

the 2N5401 transistor, is high. A high at point "8" causes a low at point "G". When point "G" is low, the

coil/flashlamp is grounded through the transistor and turns on. When point "A" toggles high the

coil/flashlamp turns off.

*

Tieback diode is not used for flash lamp circuit.

3-9

Planetary Pinball Supply, Inc