Lamp Sequencer Schematic Circuit Diagram

The purpose of this free looping lamp circuit diagram was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility. you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit.
The diagrams show three-stage circuits for simplicity. you can also add an unlimited number of stages (shown in dashed boxes), provided the last stage output was returned to the first stage input. part :
R1______________1K5 1/4W Resistor
R2____________680R 1/4W Resistor (Optional, see text)

C1_____________47µF 25V Electrolytic Capacitor

D1_____________LED any type

Q1___________BC337 45V 800mA NPN Transistor

P1_____________SPST Pushbutton

LP1____________Filament Lamp 12 or 24V (See text)

P1 pushbutton purpose is to allow a sure start of the sequence at power-on but, when a high number of stages is used, it also allows illumination of more than one LED or Lamp at a time, e.g. one device illuminated and three out and so on.
After power-on, P1 should be held closed until only the LED or Lamp related to the module to which the pushbutton is connected remains steady illuminated. When P1 is released the sequencer starts: if P1 is pushed briefly after the sequence is started, several types of sequence can be obtained, depending from the total number of stages.

You can use 6-16Vdc but not more than 24Vdc, you can also use several LEDs per module. They must be wired in series and supply voltage must be related to their number. Using 24V supply (the maximum permitted voltage), about 10 LEDs wired in series can be connected to each module, about 7 at 15V and no more than 5 at 12V. Sequencer speed can be varied changing C1 value.

Source : www.redcircuits.com
looping-lamp

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