Page 121 - Congo

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HIGH POWER SOLENOID CIRCUIT
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COIL
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The microprocessor toggles the output of the 74LS374. When point "A" is low, point "B", the collector of the 2N5401
transistor, is high. A high at point "B" causes point "G", the collector of the TIP102 transistor and point "D", the
emitter of the TIP36G transistor, to drop low. When point "D" is low, the coil is grounded through the transistor and
turns on. The coil shuts off when point "A" toggles high.
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The microprocessor toggles the output of the 74LS374. When point "A" is low, point "B", the collector of the 2N5401
transistor, is high. A high at point "B" turns on the TIP1 02 transistor and causes point "G" to drop low. When point
"G" is low the coil
IS
grounded through the transistor and turns on. The coil shuts off when point "A" toggles high.
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