Need Help Looking For Simple LED Flasher

Discussion in 'The Projects Forum' started by george0039, Oct 15, 2008.

  1. george0039

    Thread Starter Active Member

    Oct 15, 2008
    126
    5
    Hello,

    My name is George, new member here. I am looking for a LED Flasher circuit,non PIC, don`t have access to program them or understand the codes etc. So standard electronic parts would be preferred.

    I would like to have 5 LED`s with 3 on and Two off then have that alternate and be able to adjust the flash rate with a variable resistor. The LED`s would be either Bright White, Red OR Blue if Possible and run on a battery source of 6v to 12v max.

    I would like to install them into a remote controll police boat and have them act as the Flash Bar on the Roof. So the simplier the better.

    If anyone has a Working Circuit they wish to share please let me know. As for buying pre made, Yes available from overseas BUT I like to build my own as much as possible.

    Thanks for your time and help.

    George
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
  3. george0039

    Thread Starter Active Member

    Oct 15, 2008
    126
    5
    Thanks mik3 but from your link it does not say if the circuit can handle a Total of 5 LED`s with 3 on and 2 off and then alternating that, with a power supply voltage of 6v to 12v.
     
  4. boff1

    Member

    Oct 15, 2008
    26
    0
    Hi there,
    Much cheaper and simpler with a PIC. Suggest you give it a try, you may get hooked!
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    See the attached.

    The 4093 is a CMOS quad Schmitt-trigger NAND gate; a very useful device. Typical manufacturer's part numbers are CD4093B or MC14093B, with additional letters/numbers on the end.

    Note that power connections and pin numbers are not shown for the 4093, nor is the 0.1uF bypass capacitor across the Vdd and ground/Vss pins. You can determine these by looking at a datasheet.

    You could substitute TIP120 transistors for the Darlingtons I've proposed, but those I've specified are in a TO-92 case, so they are quite small.

    The 330 Ohm resistors are calculated for blue LEDs with a 25mA current @ 3.8Vf for a 12v battery. You'll have to recalculate the resistors if your LEDs have a different rating.

    R >= (BatteryVoltage - VfLED) / Desired Current
     
  6. karthik_dm

    Member

    Oct 16, 2008
    27
    0
    [quote=george0039@hotmail.com;92784]Hello,

    My name is George, new member here. I am looking for a LED Flasher circuit,non PIC, don`t have access to program them or understand the codes etc. So standard electronic parts would be preferred.

    I would like to have 5 LED`s with 3 on and Two off then have that alternate and be able to adjust the flash rate with a variable resistor. The LED`s would be either Bright White, Red OR Blue if Possible and run on a battery source of 6v to 12v max.

    I would like to install them into a remote controll police boat and have them act as the Flash Bar on the Roof. So the simplier the better.

    If anyone has a Working Circuit they wish to share please let me know. As for buying pre made, Yes available from overseas BUT I like to build my own as much as possible.

    Thanks for your time and help.

    George[/quote]


    ------------
    here u can download the led flasher schematics...

    Code ( (Unknown Language)):
    1. http://forum.allaboutcircuits.com/showpost.php?p=93117&postcount=1
     
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