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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 11-05-2013, 10:57 PM
Seehat Seehat is offline
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Join Date: Oct 2013
Posts: 12
Default Lm741/747

Hi all
I just need some help on my project.
what it will take to make a circuit that indicates by turning an led on. when a particular Ac signal is applied. For eg. 2 + A(Sin(2pi*f*t) where 1<=A<=4 and 20hz <= f <= 20k Hz.

and also switch on another led when the frequency is between 970Hz to 1.03khz.

i only know that a narrow band pass filter will be required to pass the desired frequency.
Old 11-05-2013, 11:29 PM
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MikeML MikeML is offline
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Join Date: Oct 2009
Location: AZ27
Posts: 1,219

Why start a new forum thread? Old one here.
Mike ML.

I am an engineer and academic. When I talk about current it flows from positive to negative.
Old 11-06-2013, 05:23 AM
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bertus bertus is offline
Join Date: Apr 2008
Location: Amsterdam,Holland (GMT + 1)
Posts: 12,039


As stated by MikeML, stick with one thread for one subject.

You don't have to know everything, if you know where to find it.
When you do ask questions, you may look stupid.
When you do NOT ask questions, you will STAY stupid.

It would be nice to have the Timezone ( GMT +/- x ) in the location field in the profile.
(User CP -> Edit Your Details)
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