Showing posts with label Timer. Show all posts
Showing posts with label Timer. Show all posts

Saturday, 21 April 2012

Rangkaian Timer On-Off 24 Jam

Timer On-off 24 Jam. This is a circuits are multi-range timers offering periods of up to 24 hours and beyond. This circuit can be used as repeating timers - or as single-shot timers

Skema Rangkaian On/Off 24 Hours Timer

The Cmos 4060 is a 14-bit binary counter. However - only ten of those bits are connected to output pins. The 4060 also has two inverters - connected in series across pins 11, 10 & 9. Together with R3, R4, R5 and C3 - they form a simple oscillator.

While the oscillator is running - the 14-bit counter counts the number of oscillations - and the state of the count is reflected in the output pins. By adjusting R4 you can alter the frequency of the oscillator. So you can control the speed at which the count progresses. In other words - you can decide how long it will take for any given output pin to go high.

When that pin goes high - it switches the transistor - and the transistor in turn operates the relay. In single-shot mode - the output pin does a second job. It uses D1 to disable the oscillator - so the count stops with the output pin high.

If you want to use the timer in repeating mode - simply leave out D1. The count will carry on indefinitely. And the output pin will continue to switch the transistor on and off - at the same regular time intervals.

  • Using "Trial and Error" to set a long time period would be very tedious. A better solution is to use the Setup tables provided - and calculate the time required for Pin 7 to go high. For example, if you want a period of 9 Hours - the Range table shows that you can use the output at Pin 2. You need Pin 2 to go high after 9 x 60 x 60 = 32 400 seconds. The Setup table tells you to divide this by 512 - giving about 63 seconds. Adjust R4 so that the Yellow LED lights 63 seconds after power is applied. This will give an output at Pin 2 after about 9 Hours.
  • Ideally C3 should be non-polarized - but a regular electrolytic will work - provided it doesn't leak too badly in the reverse direction. Alternatively - you can simulate a non-polarized 10uF capacitor by connecting two 22uF capacitors back to back
  • The timers were designed for a 12-volt supply. However - provided a suitable relay is used - both circuits will work at anything from 5 to 15-volts. Applying power starts the timer. And it can be reset at any time by a brief interruption of the power supply.

Wednesday, 28 March 2012

Multivibrator Astable Menggunakan IC 555

Multivibrator is an electronic circuit that at a certain time only one of two output voltage levels, except during the transition period. The transition (switching) between the two levels of output voltage occurs quickly. Two state level of the multivibrator output voltage, which is stable and Quasistable.

Rangkaian Multivibrator Monostable IC 555

Multivibrator Monostable IC 555
Rangkaian Multivibrator Monostable IC 555 is a pulse generator circuit in which the duration of the pulse is determined by the R-C connected to IC 555 timer. In such a vibrator, one state of output is stable while the other is quasi-stable (unstable). For auto-triggering of output from quasi-stable state to stable state energy is stored by an externally connected capaci tor C to a reference

Wednesday, 21 March 2012

Rangkaian Timer dengan Alarm

The IC 4060 is a 14-stage ripple-carry binary counter/divider and oscillator with three oscillator terminals (RS, RTC and CTC), ten buffered outputs (O3 to O9 and O11 to O13) and an overriding asynchronous master reset input (MR). The oscillator configuration allows design of either RC or crystal oscillator circuits. The oscillator may be replaced by an external clock signal at input RS. The counter advances on the negative-going transition of RS.
A HIGH level on MR resets the counter (O3 to O9 and O11 to O13 = LOW), independent of other input conditions. Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.

Rangkaian Timer Dengan AlarmRangkaian Ic 4060 Timer Dengan Alarm

Rangkaian Variable frequency oscillator

Variable frequency oscillator
Skema Rangkaian Variable frequency oscillator
555 timer IC provides practical solutions and relatively inexpensive for a variety of electronic applications related to the timing (timing). Especially two of the most popular application is a series of monostable and astable timing. The main components of this IC consists of comparators and flip-flop is realized with a lot of transistors.

Tuesday, 20 March 2012

Rangkaian Timer 10 Menit

When ever you need to get an alarm or intimation after ten minutes ,the circuit shown below can be used.The circuit is nothing but  a monostable multivibrator based on IC NE 555.When ever you press the reset push button the green LED D1 glows after 10 minutes.
Circuit diagram with Parts list.
  • Assemble the circuit on a good quality PCB or common board.
  • The time duration can be set by varying the POT R5.
  • The switch S1 can be a push button switch.
  • The IC1 must be mounted on an IC base.

Friday, 16 March 2012

Skema Rangkaian Oscillator LM555

LM555 Astable oscillator Circuit.
Circuit oscillator astable

Frequency of the output pulses is determined by the values of two resistors, R1 and R2 and by the timing capacitor, C.

Thursday, 15 March 2012

Time delay with 555 chip

A time delay relay circuit is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use.

  • R1 adjusts the on delay time.
  • use a different capacitor for C1 to change the maximum on time.
  • S1 is used to activate the timing cycle.

Wednesday, 14 March 2012

Timer Dengan Menggunakan IC 555

Timer dengan IC 555
Timer dengan IC 555 ini sangat berguna untuk membuat jeda tertentu untuk dapat digunakan dalam kegiatan sehari-hari sebagai contoh digunakan untuk pewaktu dan penggerak untuk memberikan makan ikan secara otomatis setiap hari.
Ketika pin 2 disulut membuat pin 3 tinggi.
Rumus: 1,1 x R1 x C1(Farad) = waktu dalam detik.
IC 555 dapat mengeluarkan arus sebesar 200mA.