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IC 555

1.រូបរាងពិតៈ

2.ទ្រង់ទ្រាយជើងៈ

• ជើងលេខ 1 (Ground):ភ្ជាប់ទៅGND។

• ជើងលេខ 2 (Trigger):ភ្ជាប់ទៅជើងលេខ៦។

• ជើងលេខ ​3 (Output):ប្រសិនបើភ្ជាប់ទៅប្រភព(ជើងលេខ៨) ហៅថាNO​ (Normally Open)។ប្រសិនបើភ្ជាប់ទៅជើងGND (ជើងលេខ1) ហៅថាNC (Normally Close)។

• ជើងលេខ 4 (Reset):ភ្ជាប់ទៅប៉ូលបូកនៃប្រភជាមួយជើងលេខ៨។

• ជើងលេខ 5 (Control):ភ្ជាប់ទៅGNDតាមរយៈកង់ដង់សាទ័រមានតម្លៃ10nF។

• ជើងលេខ 6 (Threshold):តង់ស្យុងនៃជើងនេះមានតម្លៃប្រហែល២/៣ នៃតង់ស្យុងប្រភព។ភ្ជាប់ទៅGNDតាមរយៈកង់ដង់សាទ័រ។

• ជើងលេខ 7 (Discharge):ភ្ជាប់ទៅប្រភពតាមរយៈរេស៊ីស្តង់។និងភ្ជាប់ទៅជើងលេខ៦​ និង ជើងលេខ២តាមរយៈរេស៊ីស្តង់។

• ជើងលេខ 8 (Supply):ភ្ជាប់ទៅប៉ូលបូកនៃប្រភពជាមួយជើងលេខ៤។

3.ការគណនារកហ្រ្វេកង់ និង ខូបៈ
T = 0.7 × (R1 + 2R2) × C
f = 1.4 / ((R1 + 2R2) × C)
4-LED Flasher With ic555

T = 0.7 × (R1 + 2R2) × C
   =0.7 ×(10000+2 ×8000) ×100
T =1.82 Milliseconds

f = 1.4 / ((R1 + 2R2) × C)
  =1.4/((10000+2 ×8000) ×100
f =549.451 Hertz
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CD 4017 IC

This handy Decade Counter (or sometimes called a Johnson Counter) can be used in many circuits, I will guide you through the basics and show you an example circuit.
1.Overview
The CD 4017 IC introduced in 1968 and still popular today, is a 16-pin CMOS Decade Counter which is part of the 4000 series - a family of industry standard integrated circuits which implement a variety of logic functions.
2.Pin Configuration

• Pin 01: Output 5 (the 6th sequential output)
• Pin 02: Output 1 (the 2nd sequential output)
• Pin 03: Output 0 (the 1st sequential output)
• Pin 04: Output 2 (the 3th sequential output)
• Pin 05: Output 6 (the 7rd sequential output)
• Pin 06: Output 7 (the 8th sequential output)
• Pin 07: Output 3 (the 4th sequential output)
• Pin 08: Ground (0V Rail)
• Pin 09: Output 8 (the 9th sequential output)
• Pin 10: Output 4 (the 5th sequential output)
• Pin 11: Output 9 (the 10th sequential output)
• Pin 12: ÷10 output (CO)
• Pin 13: Latch enable (LE)
• Pin 14: Clock in (CLK)
• Pin 15: Reset (RST)
• Pin 16: V_dd (voltage between +3V and +15V)

3.Operation
The CD 4017 IC takes clock pulses from the Clock input, and makes one of the ten outputs come on in sequence. Each time a new clock pulse arrives it will go to the next sequential output. If the Reset pin receives a high input the sequence will start again from Output 0 (Pin 3).

If the Enable pin receives a high input it pauses the counter and stops wherever it happens to be when Enable goes HIGH. The ÷10 Output is HIGH for counts 0-4 and LOW for counts 5-9.
4.Example Circuit
This circuit uses a 555 Timer to generate a continuous square wave pulse which is feed into the Clock input of the CD 4017 IC. Each time a pulse is received the next sequential output is set to HIGH lighting the LED for that sequence.

Download:Circuit wizard Project File
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