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50PCS Wholesale LED Flash DIY Kits Circuit Electronic Production DIY Suite 1.2mm

Product Description

This circuit is commonly called a Flashing LED or Blinking LED and has the technical name FLIP FLOP or ASTABLE MULTIVIBRATOR. It uses two transistors to alternately flash two LEDs and will operate from 3v to 9v.
1. Suite Features

 

Suite Name: Flashing / Blinking Light

Suite Type: YSG-1

Operating Voltage: 3~9V

Dimensions: 30*28mm

 

2.Operation Principle
There will be a slight difference between the gain (the ability to amplify) of the two transistors, Q1 and Q2 and one of them will turn on faster to start the circuit flashing. If Q1 turns on first, the voltage on the collector will be very near to 0v and D1 will illuminate. At the same time the positive lead of C1 will be at about 0v and the negative lead will also be about 0v. This will put 0v on the base of Q2 and Q2 will be turned off. This means LED D2 will not be illuminated.
C1 will gradually charge (in the opposite direction to its polarity) via 10k resistor R2 and when the base of Q2 see a voltage of about 0.65v, it will start to turn ON.
This will reduce the voltage on the collector of Q2 and make the positive lead of C2 drop. This will cause the negative lead of C2 to drop also and reduce the voltage on the base of Q1. This will start to turn off Q1 and the voltage on the collector will rise.
This will further increase the voltage on the base of Q2 and it will turn on more. This action is called REGENERATIVE ACTION as one transistor will turn off and cause the other to turn on. This occurs very quickly and the two transistors swap states. This means the second LED illuminates and the first LED is not illuminated. The flashing frequency depends on the value of C1, C2, R2 and R3.
 
3.Circuit Diagram
 
4.List of Components

Item Name

Specifications

Code

Qty

Resistor

470R

R1 R4

2
 

10K

R2 R3

2

Capacitance

47uF/16V

C1 C2

2

LED

Ф5 Transparent Red

D1 D2

2

Transistor

9014

Q1 Q2

2

Cable Terminal

2P

J1

1

PCB

FR-4 28*30mm

1

1

 
 
Packages:
 
50pcs kit per pack 
 
 
1.All payments must be prepaid.
 
1. We are not responsible for undeliverable address, we reserve the right to charge the shipping fee again for returned items due to wrong address.
2. We will ship out your package by China post as soon as possible, it usually takes around 7-14 business days (USA, CA, AU, UK), others country takes around 10-20 business days (Brzil, India, RU), exact delivery time depends on postal process.
3. If you do not receive your item by 30 business days, Please feel free to contact us via ebay mail system, we will try our best to resolve any problems with you.
4. the import tax/duty is the buyer's responsibility, not included in the price and the shipping fee. It is charged by the custom of your country.
(Pls note, business days means Sat. & Sun. excluded)
1. We offer 30 days money back guarantee return policy .
2. Our warranty does not extended to any products that are physically damaged or that are not under normal operating conditions as a result of misuse or improper installation on the buyer/user's part.
3. For all returned products, buyers MUST contact us for the returning address.
4. In all cases, buyers pay shipping fees at their own cost to return products for exchange or refund. We will be responsible for the postage of replacements. Refund will be made upon receipt of the returned item.
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