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F1ashlamps
The Flashlamps operate on +20V unregulated DC . This circuit works the same as the other
solenoid circuits, except that it does not use a Tieback Diode .Drivers 17 to 20 are Flashlamps .
DRIVE
POWER
A
POtN.r DIi'tler
eowd
The microprocessor toggles the output of the 74LS374. When point
"N'
is low,point "B" the collector
of the 2N5401 transistor is high. Once po int "B" is high, point "C" the collector of the TIPI02
transistor is low. When point "C" is low the flashlamp is grounded through the transistor and the
flashlamp turns On . When the lowat po int
"N'
toggles to a high state the circuit shuts Off.
General Purpose
The General Purpose Solenoids are a cross between Low Power Coils and Flashlamps. The
Tieback Diode is optional and determined by the wire harness. If a General Purpose Solenoid is
used as a coil driver the diode is connected to +50Vthrough the cable harness. If a General Purpose
Solenoid is used as a flashlamp driver, the circuit operates on +20V unregulated DC and the
Tieback Diode is not connected. 21 to 28 are General Purpose Solenoids.
DRIVE
POWER
• "P!ay1Iokl
CI'<u t _
uoocllor ooi 4- •••••• only (oi_
+Sov
Of
.~V).
II usocIlor looI>Iomp
clliv.r .••• ~kI
dr ait~ .
T 'MIb~
Oiode is not UNcI tot
IMHM 'IfI'
dfa.Ji l
As with the other solenoid circuits, the microprocessortoggles the output of the 74LS374. When point
"N'
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 turns On. When point
"AI>
returns
to a high state the coiVflashlampshuts Off.
3-12
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