here you can learn how to make ir pen for your interactive white board
the next video will show you how to do
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IR pen
ir pen for interactive white board
here you can learn how to make ir pen for your interactive white board
the next video will show you how to do
share on: facebook
here you can learn how to make ir pen for your interactive white board
the next video will show you how to do
share on: facebook
ir detector
General Idea:
An IR signal is “seen” by a reverse biased IR diode which produces an electrical signal according to the light intensity. This signal is then amplified trough a transistor which powers an ordinary LED. This means that the LED will light up when the IR diodes receives some IR light (from a TV remote for instance).
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An IR signal is “seen” by a reverse biased IR diode which produces an electrical signal according to the light intensity. This signal is then amplified trough a transistor which powers an ordinary LED. This means that the LED will light up when the IR diodes receives some IR light (from a TV remote for instance).
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christmas gifts for free
Are you late and forget your christmas presents
here you can save your time and make or get simple christmas present
its very cheerful for your family and donot forget the christmas inspirit
its very cheerful for your family and donot forget the christmas inspirit
1.Christmas Presents for Dad
– To start with, you can present your Dad with a gadget or just a plain card telling him how much you really care. If he loves a certain sport or book, you can purchase a sports kit or his favorite novel as your gift for him. A smart wristwatch can make a good gift item, so think about it.
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Audio amplifier output relay delay
Audio amplifier output relay delay
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is wait around 5 seconds ofter the power up until the spakers are switched to the amplfier output to avoid annoying "thump" sound from the speakers. Another feeature of this circuit is that is
disconnects the speaker immdiatly when the power in the amplifier is cut off,
disconnects the speaker immdiatly when the power in the amplifier is cut off,
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