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Thanks to Stanley for sponsoring the contest this week. They will be providing a Compact HID Spotlight to a lucky contest winner. This flashlight would have come in handy last year when we did some travels and visited a number of campgrounds. It usually ended up being dark when we were setting up camp and light was always an issue. We had a number of flashlights but you can never have one that is too bright. With a 10 second warmup time and an output of 3000 lumens this $69.99 flashlight is sure to be a hit for Stanley. It can be charged from a cigarette lighter in 2 hours so there is no more dead battery problems. This contest will run for one week (February 20, 2010 – February 26, 2010) . Ending time is based on central standard time. To enter, identify the item pictured above and give an example of what can be done with it. Please do not give the answer in the comments.
Send an email to contest @ hackedgadgets.com with “Name the Thing Contest” as the subject, and the message body consisting of:
The winner will be chosen at random from all of the correct entries. ———————————–———- Added Mar 10, 2010 The item to guess was a Voltage Regulator The winner is Andrew C. (there were 158 entries) I was totally impressed by the bunch of people who described sections of the circuit and how they function! ————————————–———- Below is a pictures of the prize.
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February 20th, 2010
It’s a circuit diagram! Do I win?
February 21st, 2010
Ah! Figured this one out! Entry submitted
February 21st, 2010
How specific do the answers have to be?
February 21st, 2010
I have been getting lots of email questions about this one so I will clear things up a bit which might also give a bit of a hint.
The schematic is of a popular IC, you need to send in the name of the IC (part number of family type is fine) and what it can be used for.
February 21st, 2010
LOL Shadyman
February 22nd, 2010
Wow, didn’t realize that NOT gates were this complicated
February 23rd, 2010
20 years ago my teacher of Circuits make me a test about the function of this circuit. I recognized immediately the diagram
Thanks you Manuel Correa!
February 23rd, 2010
If you look closely, you will see contest 117′s circuit in the upper right corner of this one…
February 26th, 2010
Looks like the plumbing diagram for my house.
February 26th, 2010
Very clever of you to have reverse-engineered the random acceleration circuit of Toyota vehicles!
Vin = Velocity In
Vout = (Random) Velocity Out
February 26th, 2010
When this is over someone will have to tell me what Q11 is, otherwise I can at least follow the schematic.
February 27th, 2010
Steve, it’s a weird one indeed I think q11 is some constant current thingy somehow It seems powering the long-tail-pair q1-q18 wich is the heart of the differential amplifier
February 27th, 2010
Here is what the items was this past week.
http://www.national.com/ds/LM/LM340.pdf
February 27th, 2010
Hah. Very nice.
March 8th, 2010
So, I guess equivalents are taken as correct answers? Or the LM340 exclusivily? (Still hope to win the prize though
)
March 10th, 2010
Winner announced.
March 10th, 2010
Can you post one or two of the best descriptions of how the parts of the circuit work? This could be educational!
March 10th, 2010
Hi Steve,
Sure, here are a few of them, I will leave out the names though. If you want to claim you thoughts though please comment below.
——————————–
Q16 is the pass transistor — it’s the one that “gets hot” as its
collector-emitter voltage drop absorbs essentially the entire
difference between input and output voltages. R1 and D1 form a zener
diode reference voltage. R16 is a current sense resistor, with a
small voltage drop that is used to sense too much current (or an
output shorted to ground), which then can act to shut off the output
transistor. R20 and R21 form a ratio used for feedback — where the
specific value of R20 is chosen for different desired output voltage
(7805, 7808, 7812, etc).
——————————–
Output voltage is determined by the resistor R20 (The output voltage is set by manufacturing to some discrete level, usually one of the following: 5 – 6 – 8 – 9 – 12 – 15 – 18 – 24 volt). Output current limitation is determined by the resistor R16. Here it is 0,25 ohm which implies the current limitation 3A.
——————————–
My best guess is a precision voltage regulator.
What it can be used for: Could also be a constant current source? as R16 is a current sensing resistor and R20-21 is the output voltage divider. R1 and the Zener diode D1 provide a voltage reference and I’m guessing but might have over current shutdown and very good ripple rejection.
May 31st, 2010
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