Basic HTML Version
LAMP CIRCUIT
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J137-2
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J137-S
J137-6
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lAMP MATRIX CIRCUIT
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PLAY FIELD
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POWER DRiVER BOARD
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Th~ processor sends a signal to Ihe column circuit causing the output of the UNL·2803 to toggle. When pOint MAO drops
low, the T1P107 transrstor coo ducts and point'S" changes 10a high stale. At the same time. the processor dflves the input
01 the 74LS74 low. causing a high at output
OF'.
A high state at the base af TIP102 causes the transistor to conduct.
bringing the row circuit to ground and turning the lamp on.
,
The processor changes the input of the 74LS74 to a high state to turn the lamp otf.
In overcurrent conditions, the lamp is shut off through the comparator. If the voltage at the negative input of the LM339
'ises above 1.4V. lhe output changes to a low, which is fed back 10 the 74LS74 and Shuts the row circuit 011.
3-4