Advice 1: How to connect led

If you want to upgrade your computer with some fancy "chips", the easiest way to use LEDs – they are simple, cheap and do not require any special skills and tricks. The led can decorate your workspace to give it more lighting, and just to lighten the mood. To connect your led, follow our step-by-step instructions.
How to connect led
You will need
  • 1. LEDs
  • 2. soldering iron and all that is needed to work with it
  • 3. resistors that will reduce voltage and amperage from a power source
  • 4. connectors required to connect LEDs to PC
  • 5. tester to check the voltage
  • 6. wire cutters to strip wires
  • 7. heat shrink tube
Before you begin, make sure that you have all the necessary tools and devices for work.
Connection connector 4-pin molex.First, let's see how to connect the led connector to the 4-pin molex. This is a fairly common connector in the computer, so it is quite possible that your computer it is. This connector contains four contacts:1. +12V (yellow wire)
2. +5 V (red wire)
3. Two ground (black)Choose where you want to connect the diodes to 12 or 5 volts. Connector acquire or remove old unwanted devices. Tester check if the selected contacts, identify where the diode is positive, and where negative contacts.
Wire strip pliers, solder the resistor to the positive pin of the connector. Connection close shrinking. To the second contact of the resistor solder the positive contact of the led. Close the soldering heat-shrink tubing. Take the negative terminal of the led and solder it to terminal "earth" connector.
Connect the led to the power and check if it works.
Connection cable USBМожно to connect the led to the cable with a USB connector. Such cables have two types, but the fundamental difference in the course of the work they have, so find any unnecessary cable and proceed.USB cable is four pins, two of which transmit data one contact is ground, and one transfers the stress. That's up to him then you need to connect the led. Tester check the voltage and determine the positive and negative pole of the diode.With wire cutters, strip the wires that transmit voltage. Solder the resistor to the positive terminal, place spikes, close shrinking. To the second contact of the resistor attach the positive contact of the led and cover the spikes. The negative terminal of the diode solder to the terminal "earth", cover the spikes are shrinking. Connect the USB cable to the computer and check if it works.

Advice 2 : How to connect diodes

Active components, including diode, different from the passive that require connection to a certain polarity. In addition, when you connect the diodes it is necessary to consider parameters such as forward current and reverse voltage.
How to connect diodes
The cathode of the diode is the negative electrode, and the anode is positive. When the voltage applied to the diode in this polarity, its resistance becomes very small, and can be a considerable current; and when in reverse polarity, the resistance becomes very large, and the current is so small that it can be ignored. But note that the polarity of the output voltage of the rectifier depends on the electrode connected to the voltage source. The same load is attached to the opposite conclusion.
For example, if the output half-wave rectifier need to get a voltage that is positive relative to the common wire, connect the anode of the diode to the secondary winding of the transformer and the cathode to the load. The remaining unconnected insights, as winding, and the load must be connected to the common wire.
Full-wave rectifier will require for its manufacture of two diodes and a transformer with a tap from the middle of the secondary winding. Connect the outlet with the common wire and to each of the extreme terminals of the secondary winding connect the anode of the diode. The cathodes connect them together. The positive contact of the load connect to the connection point of the cathodes of the diodes, and negative — to the common wire. If you change the polarity turn on both diodes, then you have to change the polarity of the switching load.
The bridge rectifier consists of four diodes. Take two diodes and connect the anode of one of them to the cathode of the other, and the remaining conclusions yet will not connect. This will be the first point of supply of the AC voltage. Repeat with the remaining pair of diodes, and get a second feed point of the AC voltage. Connect the remaining cathodes, and you get the point of removal of the positive rectified voltage. Connect the remaining anodes, and get the point of removal of the negative rectified voltage. Bridge rectifier, possessing all the advantages of the conventional full-wave, does not require the presence of the secondary winding of the withdrawal.
If the load is sensitive to ripple, connect parallel to it, the polarity of the filter capacitor. Note that this output voltage will increase (to 1.41 times). Do not exceed the following parameters of the diode: maximum load current (i.e., maximum current that can flow through the diode when it is open) and the maximum reverse voltage (i.e., voltage applied to the diode when it is closed). Do not touch the conclusions of parts under high voltage (there may exist in the secondary circuits), and circuits not isolated from the network - do any parts. When filters, before touching the parts after de-energization discharges the capacitor.
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