As the timing capacitor, C charges through resistors R1 and R2 but only discharges through resistor R2 the output duty cycle can be varied between 50 and 100% by changing the value of resistor R2. By decreasing the value of R2 the duty cycle increases towards 100% and by increasing R2 the duty cycle reduces towards 50%. If resistor, R2 is very large relative to resistor R1 the output frequency of the 555 astable circuit will determined by R2.C only. The problem with this basic astable 555 oscillator configuration is that the duty cycle, the "mark-to-space" ratio will never go below 50% as the presence of resistor R2 prevents this. In other words we cannot make the "ON" time shorter than the "OFF" time as (R1 + R2)C will always be greater than R1.C. One way to overcome this problem is to connect a signal bypassing diode in parallel with resistor R2 as shown in the below link.
Improved 555 Oscillator Duty CycleBy connecting this diode, D1 between the trigger input and the discharge input, the timing capacitor will now charge up directly through resistor R1 only, as resistor R2 is effectively shorted out by the diode. The capacitor discharges as normal through resistor, R2. Now the previous charging time of t1 = 0.693(R1 + R2)C is modified to take account of this new charging circuit and is given as: 0.693(R1.C). The duty cycle is therefore given as D = R1/(R1 + R2). Then to generate a duty cycle of less than 50%, resistor R1 needs to be less than resistor R2.
No, cant use bistable multivibrator in place of monostable multivibrator... because monostable is meant for one stable state and one unstable state.. so there will be a constant time period for the alternate pulses of output.. but in bistable multivibrator, both are stable states.. so there is no specific time period for the output pulses.. the state will vary only on the application of mannual trigger...
applications of monostable multivibratorA monostable is a circuit that will respond to a stimuli only once and only for a period. Its usage can be many depends of applications
A 555 chip is used as a timer. In a monostable circuit the chip will send one pulse after a period of time. If the chip is in a astable circuit it will send pulses forever.
Boost charging involves a high current for short period of time to charge the battery. It is generally if the battery has been discharged heavily. Boost charge enables the quick charging of depleted batteries.
By fully charging and fully discharging some batteries the expected charge time can be increased. Some rechargable batteries will last longer per charge if they are fully discharged before you recharge them again. Recharging batteries before they are fully discharged may cause a battery memory effect that will allow the battery to run for a shorter period between recharges.
My battery was fine as soon as disconnected build in CD/radio player.
The resistor and capacitor helps you to adjust the time period (or frequency) of the timer. (Usually astable multivibrator is used as a timer in electronic circuits) More the resistance, less is the current flowing through it. If the current flowing through is it to charge the capacitor is less, then the capacitor charges slowly. The timer changes it's state when the capacitor charges to a specific voltage ( Usually 1/3Vcc or 2/3Vcc). As it is made to charge slowly due to the high resistance, the clock frequency decreases. In the same way, to increase the frequency of the timer, the resistance value needs to be reduced.
You will get your period soon, just be patient with yourself. Trust me periods are NOT fun!
I believe you are referring to charging a mobile phone. If this is the case, mobile phones change their charging technique at something like when they are 90% full. Instead of being in full charging mode, they switch to trickle charging mode. This is an effective means to charge a battery over a long period of time without hurting the battery- i.e. if you accidentally leave your phone charging all weekend, instead of the required 2 hours.
Same applies to all cars. A battery charger will be the best way, it slow charges the battery over along period of time, say 24 hours. Batteries only last about 4-5 years, so always check manufactures label on battery and charger, and charge in temperatures over 40 degrees F.. Charging should be done with cables off so not to damage computer. Charging a dead battery is passing current from positive to negative, instead of the reverse when it's slowly discharging. This changes the electrolyte level to its original state of charge. Again, the slow charging method as described above is the best. And don't forget to check electrolyte level on non maintenance free batteries.
Last time this happen to me, it was a sign of the battery going bad. It kept stop charging at shorter and shorter period until my battery can barely hold 10 minutes worth of power.
I am asuming that you havent had your period before, so it would be spotting. Your really close! At first discharge is white and later on it gets brown because some blood is in it. If you are expirencing itching, you might have an infection.