Page 117 - Johnny Mnemonic

FLASH LAMP CIRCUIT
ipOWERDRNERBOARD--------l
I •
I Drive vee
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FLASH LAMP I J 113
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L - J
Black-XXX
J106
or
J107
Red-White
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 "C" 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
"A" toggles high, the current shuts off.
SPECIAL (GENERAL PURPOSE) SOLENOID CIRCUIT
:POWERDRNERBOARD--------~2Xl. I
I 0 n ve vee X I
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IJl13 I
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L - _
680
FLASHLAMP
or
COIL
Jl06
I Blue-XXX
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or
Jl07
+ Red-White
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100ml
50V 10KO
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 "C". When point "C" 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 flashlamp circuit.
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