Parts List
List of parts for tachometer.
Resistors All 0.25 Watt metal film or carbon film. (Except for the preset)
R1, R2,R20,R22 10K R3, R4, R5, R6 2K2 R7, R8, R9, R10, R11, R12, R13 180R R14 10K preset R15 Depends on sensor used. For Maplin SY-CR102 47K For Alegro ATS642LSHTN-I1 100R For Alegro ATS665LSG not fitted. R16 For Maplin SY-CR102 270R Not needed for hall effect sensors. R17 3K3 R18 470K R19 470R R21 Not used
Capacitors
C1, C2 22 pF ceramic
C3, C5, C7 100 nF 50V
C4, C6 100 uF 25 V electrolytic
Semiconductors
IC1 PIC16F628A (DIL package)
IC2 7805 voltage regulator
IC3 LM393 (DIL package)
Q2, Q3, Q4, Q5 BC557 Transistor (Note there is no Q1)
Misc
1 3 mm LED (Any colour)
1 4 digit LED 7 segment common anode display AVEGO HDSP-B04G
1 20 MHZ crystal HC49/S
1 18 pin DIL socket
1 8 pin DIL socket (Optional)
1 16 or 20 way SIL socket strip
1 Tactile switch 5 mm
1 Stripboard 95 mm x 65 mm ( 34 copper strips)
Optional sensors Gear sensors
Allegro ATS642LSHTN-I1 (Farnell stock code 1521698)
Alegro ATS665LSG (Farnell)
Reflective opto sensor
SY-CR102 (Maplin)
Resistors All 0.25 Watt metal film or carbon film. (Except for the preset)
R1, R2,R20,R22 10K R3, R4, R5, R6 2K2 R7, R8, R9, R10, R11, R12, R13 180R R14 10K preset R15 Depends on sensor used. For Maplin SY-CR102 47K For Alegro ATS642LSHTN-I1 100R For Alegro ATS665LSG not fitted. R16 For Maplin SY-CR102 270R Not needed for hall effect sensors. R17 3K3 R18 470K R19 470R R21 Not used
Capacitors
C1, C2 22 pF ceramic
C3, C5, C7 100 nF 50V
C4, C6 100 uF 25 V electrolytic
Semiconductors
IC1 PIC16F628A (DIL package)
IC2 7805 voltage regulator
IC3 LM393 (DIL package)
Q2, Q3, Q4, Q5 BC557 Transistor (Note there is no Q1)
Misc
1 3 mm LED (Any colour)
1 4 digit LED 7 segment common anode display AVEGO HDSP-B04G
1 20 MHZ crystal HC49/S
1 18 pin DIL socket
1 8 pin DIL socket (Optional)
1 16 or 20 way SIL socket strip
1 Tactile switch 5 mm
1 Stripboard 95 mm x 65 mm ( 34 copper strips)
Optional sensors Gear sensors
Allegro ATS642LSHTN-I1 (Farnell stock code 1521698)
Alegro ATS665LSG (Farnell)
Reflective opto sensor
SY-CR102 (Maplin)