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Forums
4hv.org :: Forums :: General Science and Electronics
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Free 555's

Move Thread LAN_403
Conundrum
Mon Jul 24 2006, 10:42AM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
Seems that the road lamps now use a 555 instead of discrete transistors.

This could be useful, as the chip is a LM555B so should work at lower voltages.

Might be amusing to hack the PCB as its just a standard flash schematic with a driver transistor :)

-A
1153737757 96 FT0 Streetlight
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ragnar
Mon Jul 24 2006, 10:49AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Whoa funky... wish we had those here =P

Cute, I'll look up the max freq of the lil guys..
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AndrewM
Tue Jul 25 2006, 12:39AM
AndrewM Registered Member #49 Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
What the hell is that a picture of, and how is it free?
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EDY19
Tue Jul 25 2006, 04:53AM
EDY19 Registered Member #105 Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I'm guessing it is one of those yellow cones used for road construction- how they are free may have some legal issues attached tongue
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Conundrum
Wed Jul 26 2006, 09:45PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi.

Not really, I got mine from a smashed light.

So far (i asked) it seems that its a public service to remove their smashed remains from the road before they get stuck in someone's tyre. so as long as you don't get greedy you should be OK.

-A
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...
Sun Jul 30 2006, 02:14AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Well if you can find those laying arround great for you suprised I would be after the 50 led's and the big gell cells that are in the ones arround here... But that might be because I have >100 dip8 555's and 20 so-8 ones wink
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dan
Sun Jul 30 2006, 06:35PM
dan Registered Member #223 Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
Well even if I did have those kind of road lamps here it's far easier to just buy dip-8 555's for $0.45/pc. The road lamps here seem to use a cheap relay type flasher box like whats used in a car. (They make a clicking sound). Never really had much use for SMD components anyway. But yeah it is faily interesting to see a factory made device that actually still uses a 555..
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