LED Flashing Heart

Mon, 23 Mar 2009 07:11:08 +0000

This is the LED flashing circuit, since the shape used in this circuit was hearth shape, then we call it LED flashing heart circuit. The circuit is quite simple, low cost, easy to built. Alternatively, you could be create another shape, not just heart shape.

Schematic diagram:

LED Flashing Heart Circuit Diagram

Component list:

Resistors
R1, R2	–	470 ohm, 1/2-watt
R3-R5	–	100 ohm, 3-watt
R6-R8	–	1000 ohm, 1.4-watt
R9	–	5000 ohm potentiometer

Capacitors
C1, C2	–	100uF, 16 volts, electrolytic radial

Semiconductors
IC1	–	4047, low power monostable/astable multivibrator
Q1-Q3	–	2n3643 NPN transistor or equivalent

Diodes
LED1-LED84	–	yellow light-emitting diode
LED85-LED126	–	red light-emitting diode
LED127-LED142	–	green light-emitting diode

Other components
PS1	–	12VDC @ 500mA wall transformer

Miscellaneous: Jumper wire, solder, printed circuit board,
drill and bits,14 pin I.C. socket, and a frame or case.

PCB layout:

Component placement:

Once power has been applied to the circuit, the Red LEDs should all be flashing on and off together. The Yellow LEDs should be flashing on and off, but only every other Yellow LED should be on at one time. The Green LEDs will stay on at all times. The flash rate can be adjusted by turning R9. Connections for a fixed value resistor for R9 are provided on the board layout if preferred.To dress up the project, a favorite photograph can be placed in the heart, and a frame can be made to fit the circuit board.

Complete explanation, please visit this page

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LED Flashing Heart