How to make 12 volt dc power supply without transformer
If you don't have a transformer, you can try to make a 12-volt DC power supply using the following methods:
1. Resistor-capacitor step-down circuit: this is a simple and low-cost method, especially suitable for occasions with low power requirements, such as powering some ICs or sampling and measuring feedback current voltage. This circuit utilizes a combination of capacitors and resistors to reduce the voltage. You will need to select the appropriate capacitors and resistors to make an output voltage of about 12 volts. Note, however, that the output voltage stability of this circuit may be relatively poor and there are problems with overvoltage and overcurrent protection.
2. Using a Rectifier and Filter Capacitor: Convert 220 volts AC to pulsating DC through a rectifier and then smooth the output using a filter capacitor. This method gives a smoother DC voltage, but requires further voltage reduction to get 12 volts DC. You may consider adding a step-down circuit to the circuit after rectification and filtering, such as using series resistors or voltage regulator diodes, to further reduce the voltage to 12 volts.
3. Use an integrated voltage regulator: An integrated voltage regulator is a circuit module that automatically adjusts the output voltage. You can choose an integrated voltage regulator with an input voltage range of 220 volts and an output voltage of 12 volts and connect it to the power supply circuit. The advantage of this method is that the output voltage is stable, but it requires some basic knowledge of electronics to properly select and connect the integrated regulator.
It is important to note that whichever method you choose, you need to ensure the safety of the circuit. During operation, care should be taken to prevent dangerous situations such as electric shock and short circuit. At the same time, the created power supply should comply with the relevant electrical standards to ensure that it is safe to use.
In addition, if your application requires higher power or a more stable output voltage, it is recommended to consider using a professional power supply module or purchasing a ready-made DC power supply product to ensure the stability and reliability of the power supply.
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