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How do you build a simple timer circuit?
Timing is complicated in electronics, and there are only a few good solutions. You should use a microprocessor called the LM555 timer (or just the 555 timer). While seemingly daunting at first, this small 8-pin device affords a lot of features and can perform one-shot timing (press a button and keep a light on for a certain time determined by the resistors and capacitors), astable timing (essentially generating an on and off signal), bistable timing (controlling two lights; one on and one stage, and one on at another stage), and with some clever 'hacking' it can be used to encode an analog signal into a PCM (pulse-code modulation) signal, often used for devices such as remote controls and toy aircraft. A quick overview: There are the pins 4 and 8 which should be powered. When you use pins, you count from the bottom left, which is indicated by the small indented circle in the chip. Pin 1 should be connected to the negative end of the battery or power supply. The chip can run from 2 volts to up to 14 (some chips support 18) volts but for something like an LED, 9 volts should be good (a different voltage would mean you'd need a different resistor for the LED). Pin 5, optionally, should be connected through a small capacitor (100nF or near) to the negative end of the battery; the capacitor should not be electrolytic. This is optional as it just helps settle the value on one of the internal comparators and makes the timing more accurate. Pin 7 should be connected through a 10k resistor to positive. Pin 6 should be connected to pin 7. At the end of this series, you should connect a capacitor, which determines the timing amount (as well as the resistor). The second capacitor should be about 100 to 220 uF, which will give you a range of 1.1 seconds to 2.42 seconds. You can of course adjust to any value suited. Pin 2 is the trigger. A 10k resistor should be wired though a push-to-make switch, connected to the negative end of the battery. Then, the positive end of the push-to-make should be wired into pin 2. Pin 3, the last pin, is the output. Wire a 330 ohm resistor and a green LED into this and you are set. Wire the end of the LED to ground (the negative end). Press the button, and it should work, timing for the value of the capacitor. The formula for the time is T=1.1(CR) where C is the timing capacitors' value (C being in farads, and it will be very small), and R being the resistor connected, in ohms. This will be the larger value. The 1.1 multiplication is just because of how the timer works. The whole circuit can be build on a breadboard/prototyping board. Or, if you have the skills, you can build it on a printed circuit board. It should be noted however, this timer is not 100% accurate. Because of component tolerances, you should allow for as much as 17.5% inaccuracy in both directions. If you need more accuracy, you need to get into the very complicated world of quartz crystals, real-time clocks and the like; and even they suffer from 'clock drift' (being incorrect by up to 30 seconds a month depending on temperature). In short, if you need accurate timing, you need an atomic clock! There are many resources on the web for how to do this. Simply use Google or your favourite search engine to search for '555 timer'.
How much does a van de graaf generator cost?
You can build one for the cost of a motor, PVC pipe, rollers, belt, some wire and a couple stainless steel salad bowls...That could be around $30. See the link for one person's DIY Van de Graaf. You can buy one from Edmund Scientific for $500
What is the amperage limit of 10 gauge solid wire?
Typically 30 amps.
Can you join a 6000w cooker hop with a 30 amp junction box?
30 amps at 120 volts is 3600 watts. 30 amps at 240 volts is 7200 watts.
Is a 100 milliamp RCD more sensitive than a 30 milliamp RCD?
No, the 30 mA one is the more sensitive because it is the only one that will operate at currents between 30 and 100 mA.
How do you make a 30 second timer?
You can use the 555 timer to make a one minute solid state timer.
How do you get into the APC in Gears of War?
run past (or kill) the two boomers and then roadie run forward, when you get to a certain point a 30 second timer starts so you have to be quick
How many times must a three-minute timer be flipped to measure a half hour?
1 hour = 60 minutes. Half an hour = 60/2 = 30 minutes. 30 minutes = 30/3 = 10 turns on a 3-minute timer PROVIDED the timer is turned at exactly the right moment and turning the timer takes no time at all.
How do you play the Daily Challenge twice on Moshi Monsters?
The Daily Challenge resets once every 24 hours, at the same time every day. So, if you play the Daily Challenge shortly before it resets, you can play it again after it resets. For example, the Daily Challenge resets at 6:00 am GMT. So if you play it at 5:30 am GMT, you would also be able to play again at 6:30 am GMT. But then you would not be able to play the Daily Challenge again until 6:00 am GMT the next day.
How do you Reset the check engine light 1998 ford expedition?
Disconnect the batter for 30 seconds and this resets the computer.
What is an UJT timer?
UJT is an abbreviation for (Unijunction Transistor) the electronic component that is at the heart of a simple timing circuit. A UJT timer is a circuit used in an electonic system to deliver a specific time. For instance, a 30 second UJT timer might be used to turn on a Green traffic signal for 30 seconds, then turn off. UJT is a specifically cheap way of doing this type of timed signal. Timers using UJTs have largely be superseded by timers based on a 555 integrated circuit.
How do you play the Daily Challenge on Moshi Monsters more than once a day?
The Daily Challenge resets once every 24 hours, at the same time every day. So, if you play the Daily Challenge shortly before it resets, you can play it again after it resets. For example, the Daily Challenge resets at 6:00 am GMT. So if you play it at 5:30 am GMT, you would also be able to play again at 6:30 am GMT. But then you would not be able to play the Daily Challenge again until 6:00 am GMT the next day.
How do you reset computer on 1986 LeBaron after battery is replaced?
Disconnect battery cables from battery for 30 minutes and then reconnect battery it then resets.
What is the recommended cranium timer length for optimal gameplay experience?
The recommended cranium timer length for optimal gameplay experience is typically around 30 seconds to 1 minute per turn.
What is half of 1 minute 30 seconds?
=45 second, because a half of 1 minute =30 second and a half of 30 second= 15 second and when you add 30 and 15 = 45
Can I put an electric shower on a timer switch?
Most timer swiches are designed to operate with loads of up to 13 amps or 3 kW. Electric showers use around 8 kW (30-35 amps), so you would need a high-current timer.
What are the specifications of the d2x camera?
Max Resolution: 4288 x 2848 12.2 megapixels. Custom White Balance, face detection, 30 second shutter speed, self timer, http://www.dpreview.com/products/nikon/slrs/nikon_d2x
