555 Led Flasher Circuit | Electronic Project Circuits

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Bicycle back Safety Light with IC 555 or 7555

Flashing 13 LED unit, 3V supply Also suitable for jogger/walkers

IC1 is a CMos version of the 555 IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LEDs D1-D6 are connected to the positive supply rail. In order to obtain an alternate flashing operation, a second 555 IC is provided, acting as a trigger plus inverter and driving LEDs D7-D12. D13 is permanently on.
The LEDs are arranged in a two series display as shown below, with a center LED permanently on. This arrangement and the alternate flashing of the two series of LEDs provide a pseudo-rotating appearance.

Bicycle back Safety Light with IC 555 or 7555

Parts:
R1_____________10K 1/4W Resistor
R2,R9,R10_____100K 1/4W Resistors
R3-R8,R11-R16__10R 1/4W Resistors
R17___________150R 1/4W Resistor
C1______________1µF 63V Polyester Capacitor
C2_____________10nF 63V Polyester Capacitor
C3____________100µF 25V Electrolytic Capacitor
D1-D13_____Red LEDs 5mm. or bigger, high efficiency
IC1,IC2________7555 or TS555CN CMos Timer IC
SW1____________SPST Slider Switch
B1_______________3V Battery (2 AA 1.5V Cells in series)

Read more Source : http://www.redcircuits.com/Page24.htm

Be the first to comment - What do you think? Posted by admin - September 8, 2007 at 10:43 pm

Categories: LED Flasher, Lighting Tags: 555 led flasher circuit, bicycle Light, IC 7555

IC 555 LED Flasher

This is easy LED Flasher circuit. It use IC 555 drive LED display.

A younger brother of me just begin take an interest the electronics. Want to try build Simple LED Flasher Circuit. I then advise this circuit , because of use the integrated circuit timer highly popular type IC NE555 or LM555 very the circuit is Pulse Oscilator the frequency is low. From the circuit will think to use LED 2 pcs wink alternate. Detail , have no chicken many mites. Invite a friend sees in circuit picture better sir.

Be the first to comment - What do you think? Posted by admin - May 17, 2007 at 10:56 pm

Categories: Circuit diagram, LED Flasher, Lighting Tags: 555 led flasher circuit, led display sign, led flashlights

Headlight Flasher

This circuit was requested from an email. It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer or LM7555 timer. It is used in the astable mode.

The 555 timer output will go high for an adjustable period of time and then turn off.
It will then repeat the procedure. The time is adjusted by R1.

To hook up the circuit to your car you must locate the positive wire from the fuse box to the headlights.
Cut the wire and insert the relay contact and bypass switch.
The bypass switch will allow you to bypass the relay contact for normal headlight operation.
In the alternating headlight configuration you must
cut the positive wire to each headlight and wire in the relay contact.

From :: http://home.maine.rr.com/randylinscott/sep98.htm