How to wind a 12V DC transformer

1. Find a power supply on an old computer, as long as it can be used, the output inside plus or minus 12 volts, plus or minus 5 volts, the power is not too small, pay attention to the green wire (trigger end) and ground wire (black wire) short connected to the power supply to start. Overwhelmed wolf rate: 2 Find a 12V transformer for a black and white TV, use 4 rectifier diodes, use 7812 voltage regulator tubes, and install one with a few capacitors, the cost is as low as a few yuan, but it is not good-looking, and I understand electronic technology!

3. Find a tape recorder transformer, 4 2-stage tubes, and 1 capacitor. 4 I suggest you buy one, and be careful that the voltage regulator becomes a high-voltage bag. , can be used 220V to 12V transformer plus rectifier to obtain the dry battery series is also 12V

First of all, find a power supply on an old computer, which has not only plus or minus 12 volts but also plus or minus 5 volts, and the power can also be used, and you must short connect the green wire (trigger end) and ground wire (black wire) to start the power supply. Then find a 12V transformer, use 4 rectifier diodes, 7812 regulator tubes, and a few capacitors to install a whole.

Finally, find a tape recorder transformer, 4 2-stage tubes, 1 capacitor.

The voltage of the 8 dry cell batteries connected in series is also 12V

This transformer method is called a step-up transformer. The primary coil input is 12 volts, and the secondary coil output voltage is 220 volts. The specific methods are as follows:

First of all, calculate the number of turns per volt of this transformer, count or calculate how many turns there are in the 12-volt coil, and then be removed by 12, that is, the number of turns per volt, and then multiply 220 volts by the number of turns per volt, which is the number of turns that the secondary coil needs to be wound.

The easiest way is to find a 12-volt power variable, and use 12 volts AC to 220 volts AC, the primary coil input voltage is 12 volts AC, and the secondary coil output is 220 volts AC.

This is also calculated according to the cross-sectional area of the core: n per volt of revolutions = permeability s of the cross-sectional area of hunger, according to the number of revolutions per volt x the number of voltages required.

Finally, it is necessary to calculate the power balance, the return rate, the current selection line, and the letter for preparation.

It is determined that the ratio of turns between the primary coil and the secondary coil is 3:55, so that 12V becomes 220V.

According to the principle of the transformer, it can be known that the ratio of the effective value of the voltage of the primary and secondary coils of the transformer is equal to the ratio of its turns and the difference between the voltages of the primary and secondary coils is .

In the old transformer, the position of the primary and secondary coils is determined, and when the coil is wound, it should be noted that the ratio of turns between the primary coil and the secondary coil is 3:55, and the other positions remain unchanged, so that 12V becomes 220V.

Here the conversion of voltage has nothing to do with the power of 800W.

In the old transformer to determine the position of the primary and secondary coils, when winding the coil, it should be noted that the ratio of turns between the primary coil and the secondary coil is equal to the voltage ratio of 12V: 220V, that is: 3:

55. The other positions remain the same, so that the voltage at both ends of the wire can be guaranteed to change from 12V to 220V.

It should be noted that the conversion of voltage here has nothing to do with the power of 800W. The transformer only changes the magnitude of the voltage.

Summary. Hello dear, happy to answer your <>

A 12V DC transformer is a device that converts alternating current into 12V DC and is commonly used to drive low-voltage equipment and electronic equipment. In general, it has the following characteristics:1

Input voltage: 12V DC or 120V 220V AC; 2.Output Voltage:

Typically 12V DC; 3.Output current: according to the demand, can be customized.

4.Output power: Depends on the load capacity of the transformer and the circuit <>design

<> 12V DC transformer.

Hello dear, happy to answer your <>

A 12V DC transformer is a high-chain device that converts AC power into 12V DC power, and is commonly used to drive low-voltage equipment and electronic equipment. Generally speaking, it has the following characteristics:1

Input voltage: 12V DC or 120V 220V AC; 2.Output Voltage:

Usually positive 12V DC; 3.Output current: according to the demand, can be customized.

4.Output power: Depends on the load capacity of the transformer and the circuit <>design

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<>5.Appearance size and shape: transformers of various shapes and sizes can be made according to customer requirements, so that the flame is large, such as round, square, rectangular stove, etc.

6.Safety: The safety performance of the transformer needs to be considered.

It should be noted that when choosing a transformer, you need to consider its load capacity and power rating to ensure its normal operation. In addition, it is also necessary to pay attention to the safety performance of the transformer to avoid dangerous <> such as short circuits or electric shocks

A 12V DC variable combustion voltage carrier is a device that can convert the input power supply into an output 12V DC voltage with liquid difference. Normally, after the AC power is input into the transformer, it is processed by voltage transformation and rectification inside the transformer, and finally outputs a stable 12V DC voltage. 12V DC transformers are widely used in various types of electronic equipment, robots, LED strip lights, cameras, audio equipment and other fields.

They often come in different power and output current levels to meet the needs of different devices. When using a 12V DC transformer, you need to pay attention to the following points:1

Stability of input power supply: Correct input power supply voltage and current are important conditions to ensure the normal operation of the transformer. Therefore, before use, it is necessary to check whether the input power supply meets the requirements of the transformer and ensure that the power supply is stable and reliable.

2.Matching of output current: When selecting a transformer, it is necessary to purchase the corresponding power and output current level according to the needs of the picoambush equipment.

If the output current is insufficient, the device may not function properly or be damaged. 3.Ventilation and heat dissipation conditions:

When using a 12V DC transformer for a long time, the problem of ventilation and heat dissipation also needs to be considered. Because the transformer itself generates heat, it can cause excessive temperature in confined spaces or poorly ventilated environments, affecting the life of the equipment. Therefore, it is necessary to ensure that the transformer has sufficient heat dissipation conditions.

Teacher, what kind of rectifier bridge is used when the transformer comes out of 11V AC is 12V DC?

Hello, it is a pleasure to serve you and give you the following answer: The reason for this problem is that the AC voltage of 11V cannot be directly converted into a DC voltage of 12V. If you want to convert to a DC voltage of 12V, a bridge rectifier circuit is required.

Solution: 1. First of all, we must know the size of the input voltage and the size of the DC voltage to be output, and then select the appropriate bridge rectifier circuit. 2. Assemble the bridge Naki rectifier circuit according to the circuit diagram, input the AC voltage of 11V into the bridge rectifier circuit, and output the DC voltage of 12V.

3. Connect the bridge rectifier circuit to the power supply and ensure the stable operation of the circuit. Related knowledge: The bridge rectifier circuit is a circuit used to convert AC voltage into DC voltage, it includes four thyristor transistors, each state transistor has a positive and negative poles, when the positive and negative poles of the transistor are connected, the voltage conversion can be realized.

Bridge rectifier circuits can convert lower voltages, but are less efficient, typically less than 90%.