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April Fools LEDs: |
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Canary Sound Effect: Reverse engineered circuit diagram of
a commercial Electronic Bird. This one was built into a plastic
christmas ornament and runs off a 9V battery. Note that L1 is
actually just an audio transformer with an unused secondary
winding. (added 10/04) |
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Christmas Light Flasher: |
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Christmas Star: |
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Color Organ Light : This circuit works REALLY well. Notice
how it will fire even in complete silence. This provides a sort
of automatic gain control. |
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Flashing heart: The Circuit Diagram is shown in Figure 1.
It consists of a 4047 low-power monostable/astable multivibrator,
IC1, used in the astable mode to provide the timing pulses to
control the flash rate of the LEDs. To accomplish the astable
mode, pins 4, 5, 6, and 14 are connected to +12VDC and pins 7,
8, 9, and 12 are connected to ground. Pins 1 and 3 are connected
to C2 and pins 2 and 3 are connected to potentiometer R9. A
fixed value resistor can be used in place of the potentiometer
R9, if the flash rate does not need to be adjusted. These three
pins make up the R-C timing circuit. |
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Flickering Fire Light - LED or Bulb flicker shimmer randomly
like candle flame or fire : This may well be the world's
only discreet logic circuit to generate truely random output. It
makes an excellent candle flicker light for your haloween
pumpkin, and looks much more authentic than a shimmer light
wherever a good a simulated flame effect is required. I do not
gaurantee the accuracy or safety of any information herein. |
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Grantronics Projects Christmas Tree: flashes LEDs mounted
to Christmas tree shape PCB, kit from kitsrus.com |
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Halloween Flashing-eyes Badge: Two-LEDs act as eyes
following the rhythm of music or speech. 3V Battery-operated
device suitable for pins or badges. |
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Heart of LEDs: One of the requests we received after
publication of the Christmas Star was "can you do different
shapes?" Well, with Mother’s Day coming up soon, we thought a
heart would be appropriate. Now you can have something different
to give to that special Mum or Grandmother. Or you may be able
to redeem yourself if you forgot St Valentines Day! Either way,
the Heart will certainly last a lot longer than the traditional
bunch of flowers!. |
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How to Make Chase Lights: This example shows3 track chase
lights built from3-Christmas light sets and1-light chaser
controller |
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Illuminate holiday destinations on a World map: |
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LED Christmas lights : |
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Simple 10 Stage Control Box: For those of you out there who
don't want to dive into computer control of your Christmas
display yet, here's a happy medium. It's a simple circuit that
has up to 10 outputs available |
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Simple scheme saves string-light situation: 12/16/04 - EDN
on Components (added 1/05) As you enter the holiday season with
strings of ac-line-powered lights hanging everywhere, do you
ever wonder how bulb vendors overcame the frustrating problem of
having an entire string go dark when just one of th |
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Simple tester checks Christmas-tree lights: 12/16/04 - EDN
on Components (added 1/05) 1Why is it that you always test 48
bulbs before you find the bad one in a 50-light string? This
simple circuit allows you to divide and conquer, greatly
reducing the time it takes to find the bad bulb. |
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Xmas Light Flasher: |
