LED flasher for verifying fiber bundles

With the circuit shown in Figure 1, you can verify the bundle , especially when the link passes through several plug-in boards. You can see the two high-brightness LEDs it uses at the far end. The flasher turns off after about 50 minutes and consumes very little power in the off state. The circuit operates on multimode fibers that are more than 1 km apart. It can also be used with single mode fiber, but it is more difficult to see on the receiving end. If the fiber is very short, it is best to look at the far end at a small angle because the LED is very bright.

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Verify Fiber Bundle Circuitry


Figure 1. This circuit allows you to verify the bundle when the link passes through several plug-in boards.

IC1B is a Schmitt-triggered oscillator operating at approximately 5 Hz, driving IC2, which is a 4020 binary flip-flop. IC3A is a control bistable multivibrator. Pressing button switch S1 sets up the flip-flop, which activates the oscillator and enables 4020 to begin counting from its all-zero state. It also enables gates IC1A and IC1D, which control the PNP LED drive transistors. Pressing the push button switch S2 resets the control flip-flop; or 4020 reaches the end of its count sequence, resetting the flip-flop. IC3B divides the oscillator frequency by 2 to provide a 50% duty cycle to the LED driver. The T1-3⁄4 LEDs are well mounted in the ST barrel connector with glue to hold them in place. You can use patch cords to match the fiber connectors in your network. Considering the attenuation of the fiber, the yellow LED is also suitable.

. But if you choose to use two red LEDs, you should drive one of the LEDs at the oscillator frequency and drive the other LED at half the oscillator frequency. Component values ​​and placement are not important; the circuit shown in Figure 1 is located in an older surface mount fiber optic jack box.

Electric Cable

Electric Cable can be divided into building wires and flexible cables
Building wires can also be divided into three types according to the hardness of conductors.
H05V-U/H07V-U voltage class 300/500 or 450/750V. It is the most commonly used connection line for household wiring, mainly used for power supply, lighting, sockets, air conditioners and other daily household lines
H05V-R/H07V-R voltage grade is 450/750V, which can be used for home lighting lines. It is good to use when the wiring is soft and the circuit turns too much, which is convenient for electricians to wear pipes.
H05V-K/H07V-K voltage class 300/500V or 450/750V household decoration is generally not used, and it is suitable for flexible installation sites with strict requirements, such as electrical control cabinets, distribution boxes and various low-voltage electrical equipment.
What is a flexible copper cable?
Copper flexible cables are commonly used to connect portable equipment and appliances. Their flexibility allows them to withstand the movements or vibrations present in a particular application.Flexible copper cables are made from multiple strands of fine copper wire. The conductor is made of normal annealed copper of category 4 and 5. The cable has more than 6 different coloured cores. The insulation and sheath material must have the usual electrical and physical properties. Flexible copper wire is also soft, oil resistant, low temperature resistant and flame retardant.

Construction

Conductor: Multistrand copper wire
Insulation: PVC
Sheath: PVC
Associated voltage: 450/750V
Jacket colour: black, grey, white

Applications and features.

Power cables are suitable for use in wet and dry areas, conduits, pipes, slots, trays, antennas supported by messengers, and where excellent electrical performance is required. These cables are capable of continuous operation at conductor temperatures up to 90°C (normal operation in wet and dry locations), 130°C (emergency overload) and 105°C (short circuit conditions). 1/0 AWG and larger are rated for CT use.

Household Electrical Wire,Household Application Copper Wire,House Wring Electric Wire,House Building Electric Wires

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