Motorcycle

Published on February 2017 | Categories: Documents | Downloads: 61 | Comments: 0 | Views: 416
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Parts List:

R1 = 10K, 1/2W C1 = 0.1uF/50V, ceramic
R2 = 220 C2 = 47uF/25V, electrolytic
R3 = 250K D1,D2 = 1N4005
Q1 = IRFZ44 MOSFET Led1 = High Brightness, color of your choice
U1 = MC14049 CMOS

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[Motorcycle Turn Signal KIT]
Description:
This circuit is based on the CMOS IC from Motorola, the MC14049UB Hex Inverting
Buffer. Of course, the regular CD4049 can be used and is pin-for-pin compatible. The 4049
is a 16-pin chip. Maximum DC supply voltage should not exceed 18V. The above diagram
can replace your existing mechanical clicker. The prototype worked excellently!

When the turn-signal system is first turned on, either diode D1 or D2 blocks current from
going to both lamps at the same time.

U1-a and U1-b control the signal duration, which timing is set with the electrolytic
capacitor C2 (47uF) and R3. Turn-signal duration can be adjusted with the 200K trimmer
pot R3. This signal is then fed, via the U1-c buffer to MOSFET transistor Q1, which in turn
provides enough power for driving the turn signal lamps. The other buffers drive the
'Indicator' Led1. Buffers U1-e and U1-f can drive 3.2mA each so three are needed. Current
through the Led1 is limited with R2, 220 ohm.

MOSFET transistor Q1 can be substituted for many types, it is not critical. I used the
IRF513 because I had it available at the time. The NTE66 is a direct replacement and works
great too. I experimented with other types (IRF511, IRF512, IRFZ42, IRFZ44 etc) and they
all worked satisfactory. The prototype uses the IRFZ44 and functions excellently.

For trimmer pot R3, if you don't have 200K, use 250K or 300K. They will all work but the
excess resistance is a bit overkill. The 200K is more than enough. C1 can be any type as
long as the working voltage is 50V or more. Foil types work very well but a ceramic model
can be used also.

Switch S1 is your existing turn-signal switch. You can simply take the old mechanical unit
out and replace it with this electronic version.

The Printed Circuit Board and Lay-out are listed below. Note that the pcb is *NOT*
included in the kit. Parts only.


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Page copyright © 2008, Tony van Roon.
Original author unknown. Modifications, PCB & Lay-out (C) by Tony van Roon.

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