Now here comes the theory, if you are too scared (of theory) or already understand how it works then you can be finished!
First you need to understand the 555 timer.
The first 555 timer is an astable multi-vibrator that is controlled by the voltage from the switch, when the voltage is high then it operates normally, but when the voltage is low it inhibits the operation of the 555 using the reset pin.
Red Alert Sound Effect Alarm
Legend of zelda armor upgrades. Then when the output of the 555 goes high it charges the capacitors through the diode, which as they discharge slowly through the 10KΩ resistor (labeled R7) they create the changing tone you hear.
When the first 555 is high then the second is inhibited, but when it goes low the second is enabled to create the tones determined by the capacitor's charge level.
Now use your voltmeter to measure the voltage at the base of the PNP transistor, as the LED flashes you should be able to see the change in the voltage.
Now put your meter's leads in series with the speaker and measure the current through the speaker.
http://tvtropes.org/pmwiki/pmwiki.php/Main/RedAlert
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All hands to battlestations!
The sirens shrilled, urging everyone to panic.
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The phrase 'Red Alert' comes from the naval tradition of 'General Quarters' ('Action Stations' if you're British), where a ship prepares for battle. Much of the procedures are the same. The alert is sounded by a drum or over an intercom. Off-duty sailors report to their stations, cannon are loaded, and the decks are cleared of non-essential items. On modern ships, lights flash, klaxons sound and all watertight doors are closed, thus if the ship is holed the leak is contained. BREET BREET Ah, great. See Red Alert right away, the Wiki's gone on Self-Demonstrating Article mode. BREET BREET GENERAL QUARTERS. Often accompanied with This Is Not a Drill.
In a Rescue show, or any film with an emergency service like the fire department, there is a variant of the alert that can be called the Emergency Squad Scramble. where the heroes are at their base and the dispatch call sounds. Suddenly the base explodes with activity as the klaxons sound and the dispatcher comes over the PA system with the essential information. Meanwhile, the rescue heroes move quickly, often going down sliding poles to the garage, calmly to suit up and board their vehicles with utter professionalism. Then with the vehicles' rotating lights flashing and sirens sounding, the production's theme music plays the heroes go full speed to the emergency.
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This variant also occurs with fighter squadrons before or during a Fighter-Launching Sequence . This often includes a running variant of the Power Walk that can be called the Scramble Run where the pilots are seen sprinting to their fighters in full flight gear.
If this precedes a Boss Battle, it's a Boss Warning Siren.
Now, keep in mind, this is not to be confused with Command & Conquer: Red Alert, nor with Last Alert (known as Red Alert in Japan), nor with the Red Scare. Nor does it have any particular relation to any of the Transformers characters named Red Alert (WOO WOO WOO WOO). But it is similar, however, to Defcon Five. Err..one. And to Red Filter of Doom.
See also Emergency Broadcast for a version of this for crises affecting entire communities or larger areas.
Understand? Good. Let's move out.
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Red Alert Star Trek SoundTHIS IS NOT A DRILL. THIS IS NOT A DRILL. THIS IS NOT A..Red Alert Sound Effect Mp3 DownloadAlternative Title(s):Emergency Squad Scramble, Code RedIndexComments are closed.
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