LED Based Handycam Light

Written by: Alan Parekh at 8:39 am. Filed under DIY Hacks, Electronic Hacks

Sanjiv Dutta saved some money when he decided to make this LED Based Handycam Light instead of going to the store and buying one. It looks very bright and based on the pictures on his site (scroll to the bottom) it seems to work very well!
"I have come with a naive solution, but a working one. I put resistors to drop the supply voltage when needed, by means of a 3 position switch as described in the Ckt. below. Lets see the current & voltage delivered to the LEDs that way:- It was found that , when voltage across LED = 3 v, current consumption = 20 mA approx. And for 3.1.v, it becomes about 22 mA. For 20 LEDs, that is = 440 mA Hence, if Supply voltage is 3.6 v, voltage drop needed across the resistor = 0.5 v. Again, when Supply voltage drops to 3.3 v, voltage drop needed across the resistor = 0.2 v. We do not need any resistors when Supply voltage further drops to 3.1 v or 3 v. Thus we found out the required resistor values."

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12 Responses to “LED Based Handycam Light”

BronzeG3 Says:
September 7th, 2006
Site is down are those 10mm LEDS?
amelia Says:
September 7th, 2006
cool.. will try this out!
amelia Says:
September 7th, 2006
LOL.. nice
kevin Says:
September 7th, 2006
Do you have schematics for this?
Sanjiv Says:
September 8th, 2006
Yes, 10 mm. I have schematics, but withdrawn later to hide from some unthankful greedy ppl.
Kevin pl. gimme your e-mail id I wil sent it directly.

Have u anyway saw the whole article on geocities.com/san011070/site/LED_light.htm ?

Bye…& Thx
Sanjiv Says:
September 8th, 2006
Sorry, I mean http://geocities.com/san011070/code/LED_light.htm
kulatpusu Says:
April 13th, 2007
led? not using IR? I`m intrested in using ir, and take out ir pass filter from yhe camera.
please email me,i want to know :=)
R.Vijayakumar Says:
January 5th, 2009
Kindly send the cct of handycam led light
Tk u
vijay
Alan Parekh Says:
January 5th, 2009
Hi,

We sell them online (I am not sure if the author purchased them from us though).
http://alan-parekh.vstore.ca/product_info.php/cPath/4_9/products_id/36

There is a link in the article that will take you to the authors page with contact information.
tapan pal Says:
November 4th, 2009
Kindly send the cct of handycam led light
Alan Parekh Says:
November 4th, 2009
The old link was to a geo cities site. I found the new site and updated the link. Looks like the creator sends it out by email.
Sanjiv Says:
March 7th, 2012
Dear All,
I feel rather embarrased when you ask for any CC for this naive thing (atleast in recent years). Now you have so many nice, cheap chinese LED lights…

Anyway, practicaly there was no menionable circuits which one requires for regulations or PWM etc. It was because the supply V was hardly above the required V. So I put a 1 Ohm 2W Resistor(parallelling 2 nos. of 2.2 Ohm, 1 W) to drop the approx. 0.4 V out of 3 fully charged 1.2V Cells. A switch(Black one) allows insertion/bypassing the resistor in the circuit.
The battery compartment lid was mechanically coupled with the switch such that to close the lid (normally after loading a freshly charged battery), one has to move the switch to the ‘insert’ position. That was my ‘naive’ way of ensuring ‘safe’ voltage whenever I use fresh batteries.