Model Lighthouse Project
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Joined: Jun 2010
26-11-2010, 03:55 PM

Model Lighthouse Project

This project and implimentation 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 470W LED resistor is included on the stripboard layout). The 1MW preset controls the time period (T) of the 555 astable from about 0.1 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 end of the sequence to 3s (with T=1s).
Parts Required
• resistors: 470, 2k2, 22k, 100k
• 555 timer IC, such as NE555
• capacitors: 0.1μF, 1μF 16V radial
• 4017 counter IC
• diodes: 1N4148 × 4
• DIL sockets for ICs: 8-pin, 16-pin
• transistor: BC108 (or equivalent)
• on/off switch
• 1M preset, horizontal
• battery clip
• 6V 60mA MES lamp
• 9V battery box for 6 × AA cells
• MES lampholder
• stripboard: 19 rows × 21 holes

For more information about this project and implimentation,please follow the link:

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