overhead projectors - Electronic Circuits Projects Diagrams Free

elecguy · 6th October 2006, 01:09 PM

Q) how to use a lamp to test a cct which has blown a fuse.

I dont really understand this question. can anyone help me.

HiTech · 6th October 2006, 02:20 PM

I don't really understand this thread!! Please explain your question in better detail. First off, by "overhead projector" do you mean the transparency projector type whereby a sheet of clear acetate is used on a glass platten/Fresnel lense? Or are you referring to a data/video projector that uses LDC or DLP technology? I gather that you are trying to substitute a lamp for a blown fuse? If so, typically a 60w incandescent lamp is temporarily wired in place of the fuse.

audioguru · 6th October 2006, 06:17 PM

A fuse blows due to over-current. If you bypass the blown fuse with a light bulb but the over-current problem isn't fixed then it might cause more damage.

RODALCO · 7th October 2006, 07:53 AM

I think he means that when the fuse had blown to fit a new fuse of the same amperage and put a lamp in series with the supply.
This is actually a good idea because if the fault is still there the lamp will absorb most of the the surge and the damage to the cct board may remain minimal.
Start with a 60 Watt lamp first.
May have to use a higher wattage depending upon the load from the cct under test.
If it lights up to full brightness there is a dead short in the load behind it.

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6th October 2006, 01:09 PM	#1
elecguy	overhead projectors Q) how to use a lamp to test a cct which has blown a fuse. I dont really understand this question. can anyone help me.

6th October 2006, 02:20 PM	#2
HiTech	I don't really understand this thread!! Please explain your question in better detail. First off, by "overhead projector" do you mean the transparency projector type whereby a sheet of clear acetate is used on a glass platten/Fresnel lense? Or are you referring to a data/video projector that uses LDC or DLP technology? I gather that you are trying to substitute a lamp for a blown fuse? If so, typically a 60w incandescent lamp is temporarily wired in place of the fuse. __________________ Don't make me reach through this monitor to slap you a good one!

6th October 2006, 06:17 PM	#3
audioguru	A fuse blows due to over-current. If you bypass the blown fuse with a light bulb but the over-current problem isn't fixed then it might cause more damage. __________________ Uncle $crooge

7th October 2006, 07:53 AM	#4
RODALCO	I think he means that when the fuse had blown to fit a new fuse of the same amperage and put a lamp in series with the supply. This is actually a good idea because if the fault is still there the lamp will absorb most of the the surge and the damage to the cct board may remain minimal. Start with a 60 Watt lamp first. May have to use a higher wattage depending upon the load from the cct under test. If it lights up to full brightness there is a dead short in the load behind it. __________________ There are more ways to get to Rome. Electricity, Electric clocks, Meters and Trains are great. Please don't sent me private messages, I will not answer them. The questions asked can be discussed in the open forums. http://www.youtube.com/user/RODALCO2007 some interesting electrical stuff to watch.