Basic HTML Version
Flashlamp Circuit
, POWER DRIVER BOARD
,
J12S'
+
Flashlamp
Black-xxx
J102 F111
Red-White
Power
1
-
J
The microprocessor toggles the output of the 74LS374. When point ·A· is low, point ·B· the collector of
the 2N5401 transistor is high. Once point "B" is high, point ·C" the collector of the TIP102 transistor is
low. When Point ·C· is low the flash lamp is grounded through the transistor and the flash lamp turns On.
When point "A" toggles high the circuit shuts Off.
Special (General Purpose) Solenoid Circuit
1- - - - - - - - - - - - - - • •. - - - - - - - - - - - - - - - - - -
, POWER DRIVER BOARD
Flashlamp·
or
Coil
Blue-xxx
Red-White
Power
- ,~- _ . /
The microprocessor toggles the output of the 74LS374. When point ·A" drops low, point ·B· is high. A
high at point ·B" causes a low at point ·C". When point ·C· is low the coiVflashlamp is grounded through
the transistor and the coiVflashlamp tums On. When point "A· toggles high the coiVflashlamp turns Off .
*
Tieback Diode is not used for flashlamp circuit.
Twilight Zone 3-9