Page 169 - Cirqus Voltaire

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• SPECIAL (GENERAL PURPOSE) SOLENOID CIRCUIT
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The microprocessor toggles the output of the 74LS374. When point "Au is low, point "8" the collector of
the 2N5401 transistor, is high. A high at point "8" causes a low at point "C". When point "C" is low, the
coillflashlamp is grounded through the transistor and turns on. When point "An toggles high the
coil/fJashlamp turns off.
* Tieback diode is not used for flashlamp circuit.
FLASHLAMP CIRCUIT
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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 "Cit the collector of the TIP102 transistor is
low. When point "C" is low, the flashlamp is grounded through the transistor and turns on. When point
"An toggles high, the current shuts off.
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