Lighthouse Model Project
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http://www.kpsec.freeuk.com/projects/lighthouse.htm
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Model Lighthouse Project
A kit for this project is available from RSH Electronics.
Download PDF version of this page
This project was designed for a model
lighthouse to flash a lamp in a simple
sequence: two flashes of 2s with a
short gap of 1s, followed by a longer
gap of 5s before repeating the sequence.
The 555 timer is connected as an astable to provide clock pulses for the 4017
counter. The 4017 has ten outputs (Q0 to Q9) and each one becomes high
('on') in turn as the clock pulses are received. Outputs Q0, Q1, Q3 and Q4 are
combined with diodes to produce the flash sequence. A transistor amplifies the
current to power the lamp, or LED if you prefer (a 470 LED resistor is included
on the stripboard layout). The 1M preset controls the time period (T) of the
555 astable from about 0.1s to 1.5s, for example set T = 1s.
For a different flash sequence connect the diodes to combine different 4017
outputs (Q0-Q9). If the full count from 0 to 9 is not required one of outputs can
be connected to the reset input (pin 15). For example connecting Q8 (pin 9) to reset (pin 15)
reduces the long gap at the of end the sequence to 3s (with T=1s).
This project uses a 555 astable circuit to provide the clock pulses for the 4017 counter.
For information about lighthouses in the UK visit www.trinityhouse.co.uk
Parts Required
resistors: 470, 2k2, 22k, 100k
capacitors: 0.1 F, 1 F 16V radial
diodes: 1N4148 4
transistor: BC108 (or equivalent)
1M preset, horizontal
6V 60mA MES lamp
MES lampholder
555 timer IC, such as NE555
4017 counter IC
DIL sockets for ICs: 8-pin, 16-pin
on/off switch
battery clip
9V battery box for 6 AA cells
stripboard: 19 rows 21 holes
3/9/2009 11:30 PM
Model Lighthouse Project
2 of 3
http://www.kpsec.freeuk.com/projects/lighthouse.htm
Stripboard Layout
Circuit diagram
A kit for this project is available from RSH Electronics. If you
are new to electronics buying a kit is a good way to be sure
you have the correct parts for the project.
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http://www.kpsec.freeuk.com/projects/lighthouse.htm
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John Hewes 2009, The Electronics Club, www.kpsec.freeuk.com
3/9/2009 11:30 PM