This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. An on/off switch is not included, but could be added if you wish.
The 7555 timer IC used is a low power version of the standard 555 timer. A 'superbright' red LED is used because this provides a bright flash with a low current. The LED is off for most of the time so the average total current for the circuit is less than 0.2mA. With this very low current a set of 3 alkaline AA cells should last for several months, maybe as long as a year.
The circuit will work with a standard 555 timer IC (such as the popular NE555) but this will increase the average current to about 2mA and the battery life will be much shorter. You can use a greater supply voltage (15V maximum) for this circuit but the 1k resistor for the LED should be increased to keep the LED current low at about 3mA. For example to use a 9V PP3 battery change the 1k resistor to 3k3. Note that AA cells will last longer than a 9V PP3 battery.
This project uses a 555 astable circuit.
Power supplies don't fail. Idiot.
your mom that's what it is dummy
do <some statement here, dummy> while (<a condition here, dummy>); It will repeat the statement, and after every repetition checks the condition: if false, leaves to loop.
it s a way ejfwefdm kkf,
A thyristor is a part of a alarm circuit you use it so the alarm stays on
i dont know dummy:)LOL
cause it is cheap and easily available through the electronic components stores
An internet alarm clock works the same as a normal alarm clock just it is based on the internet. You enter the time you wish the alarm to go off and as long as your computer is turned on and connected at the time then it will sound the alarm.
I have a Bradley Big Bird Talking Alarm clock and the clock works great. The alarm does not. I have read that the alarm works by the battery. I put a brand new battery in and turned the alarm hand to a desired hour but nothing happens. Any ideas? Regards Thad
Hay buddies, my computer do nothing, unless i do something with it. The Computer is simply a dummy. But the worl's most beautiful dummy.
You can't
How Do I Turn off Alarm on Athletic Works Watch ATHM4885
It means it works Security alarm
There are a few different kinds of home alarm systems available today. Each one of these alarm systems works differently.
no i dont it works fine ok..............................
no dummy no dummy no dummy
If it works -- go for it