Simple Motor Bike indicater Flasher unit in a TIC TAK box

This is instructable assumes the reader to be compident in soldering. Use a very low resistance Mosfet ideally 0.2ohms or less and acurrent capability above 10 amps (the greater the current capacity the less need of a heat sink I used a 60amp continous current transister).

Changing the value of R3 will change the flash frequency. The Battery, Lamp Flasher circiut and switch are all in Series and therefore can be put in any order.

PARTS

Strip Baord
1 x Hex MOSFET transister N channel (min rating 3 times bulb current)
1 x PNP transister
22 awg wire (shorting links)
18 awg wire to connect to power lamps and switch
220K Resister
22K Resister
6K8 Resister
1n4001 Diode
100uF Capaciter min 25v
10uF Capaciter min 25v
TIC TAK mints packet
Insulation Tape

TOOLS

Solder
Sodering Iron
Craft Knife
Snips
Saw

Step 1 Biuld the circiut

This circiut is very simple and can be made on a small piece of strip board.

Note The tall components (transister and Caps) lay flat, this is essential so as to fit in a TIC TAC box

1 Locate this point and cut the track.

2 Solder in shorting links

3 Solder in Diode and Resistors

Finaly solder in Transistors and Caps, (Note caps -ve)

Comments

[ynovaera]

That part list said NPN transistor while the schematic said PNP ...
which one is correct?

[lrdforster]

my mistake should read pnp thanks for pointing it out

[jimlim]

Can this circuit be used for LEDs instead of bulbs

[lrdforster]

Yes you can use LED Bulbs or single LED's but you will probably need load resistors equal to those used for conventional flasher units. If you want a cct of about 1/2 hz and single LED I would use 555 timer. try http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/ as a site for the astable circuit, Id use, the cost difference is negligableHowever you may need a transister to drive the LED or LED's R1= 3k3 R2= 330k C1= 4u7f This is 50% duty cycle but you can try other prefered values and get your own match

[lrdforster]

freespace.virgin.net/matt.waite/resource/handy/pinouts/555/