stuee Posted July 30, 2009 Report Share Posted July 30, 2009 Hi,Im making a little volcano for my childs birthday party with dry ice etc, i want to put in a circle around the top inside about 6 orange leds what i want to flicker like a candle light,. the led details are..LED 5MM CLR ORG 35000MCDEmitted colour: orangeLens: water clearWave length (mm): 600Pd W (mW): 500If mA: 75If mA (peak): 100Vf (V) Typ: 2.2Vf (V) Max:: 2.6mcd Typ: 30000View Angle: 15Just a simple circuit would be good. cheers. Quote Link to comment Share on other sites More sharing options...
KMoffett Posted July 31, 2009 Report Share Posted July 31, 2009 Google: candle flicker led circuitThere are a lot to choose from.Ken Quote Link to comment Share on other sites More sharing options...
lil PopTart kid Posted August 3, 2009 Report Share Posted August 3, 2009 http://hackaday.com/2008/10/30/flickering-led-circuit/thats the easiest one i could find i hope it helps Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 3, 2009 Report Share Posted August 3, 2009 Like most INSTRUCTABLES, its battery is shown connected backwards. Quote Link to comment Share on other sites More sharing options...
sparky3489 Posted August 4, 2009 Report Share Posted August 4, 2009 You could also just buy some of those LED tea-light candles. Some do have the flicker circuit built into the LED itself. Quote Link to comment Share on other sites More sharing options...
Herman the German Posted August 5, 2009 Report Share Posted August 5, 2009 Hi stuee,you might try this circuit.It uses two timer ICs and a decimal counter.Function: Timer1 (IC1) generates the clock frequency of 380Hz for the counter while timer2 (IC2) generates enable pulses for the counter. Since the frequency ratio is not dividable with an integer result the decimal outputs are active pseudo randomly.Connecting a low current LED to the diode network you might omit a current limiting resistor if VCC doesn't exceed +9V.Using a power LED omit D8 and R5 and connect transistor Q1 (BD139) as shown. For your specified LED use an 82Ohm resistor for current limiting at VCC=+9V.I recommend using two independant timer ICs since they might influence each other using a dual timer IC (NE556).HtGVOLCANO-SCH.pdf Quote Link to comment Share on other sites More sharing options...
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