LEDs or lamps sequencer circuit

Posted on Feb 7, 2014

A voltage ranging from 6 V to 15 V is supplied if only one LED per module is used. The increase in the number of LEDs also corresponds to the increase of voltage supply and the connection of additional LEDs should be in series. The maximum allowed voltage is 24 V which could cater approximately 10 LEDs in series connection. A 15 V supply can handle around 7 LEDs while a 12 V supply can handle no more than 5 LEDs. The color and brightness are the factors which the right number of LEDs depend on.

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In using a bulb or incandescent lamp, the supply of voltage can range from 9 V to 24 V. For 24 V supply, four 6 V bulbs can be connected in series. The use of bulbs with more than 400 mA of current consumption would cause the transistor BC337 to be changed with Darlington types like 2N6037 to 2N6039, BD677, BD679, BD681, and other similar types. The number of parts will be reduced if Darlington transistors were used since R1 can be omitted because of the built-in base-emitter resistor. The speed or frequency of the sequencer may be varied with the changing of the value of C1. The LED or lamp sequencer circuit can provide more attraction in advertising as it provides more animation. It was also used in interactive games from an old TV program where you have to press a letter and the sequence of LEDs follow a path up to the main screen which will tell if you pressed the right or wrong letter. It can also be used to provide entertainment for children by placing the circuit in toys such as robots and toy guns.

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