Page 109 - The Addams Family (Williams)

High Power Solenoid Circuit
DRIVE POWER
The microprocessor toggles the oulpot of the 74LS374. When point 'A' drops low, point'S' the collector of the 2N5401
transistor is high. A high at point'S' causes point 'C' the collector of the TIP102 transistor, and pOint'0' the emitter of the
TIP36 transistor to drop low. When point '0' is low the coil is grounded through the transistor and the coil turns On, The
coil shuts Off when point 'A' toggles high,
Low Power Solenoid Circuit
DRIVE POWER
To
CPU x
800nj
Pow. DrI.., IIoInI
o P..,.,Drt.I._d
JUS
The microprocessor toggles the oulpot of the 74LS374. When point 'A' is low, point '8' the collector of the 2N5401
transistor is driven high. A high at point 'B' turns On the TIP102transistor and causes point 'C' to drop low. When pOint
'C' is low the coil is grounded through the transistor and the coil turns On. The coil shuts Off when point 'A' toggles high.
Special (General Purpose) Solenoid Circuit
DRIVE POWER
To
CPU x
Boa,d
P_Orlv •• _d
Jl02
JIll
2.7KO
"PleyftoId C~cUllWI •••.•• d lor 0011_ only (••••• r .r.ov .,+20'1), W•.•• d Ior __
_ 1M pleyftoIddroun btl ••• , llobaok Diode I. nol uood lor '_p drcUl,
The microprocessor toggles the output of the 74LS374. When point 'A' drops low, point'S' is high. A high at point
'B' causes a low at point 'C'. When point 'C' is low the coillflashlamp is grounded through the transistor and the
coiUflashlamptums On. When point 'A' toggles high the coillflashlamp turns Off.
The ADDAMS FAMILY 3-7