► Information
- Low voltage circuit from 220V AC to 12V DC very simple ,. With just a few electronic links, we can create a low-voltage circuit that can be used in real life, reducing costs.
- Convert voltage from AC 220V to 12V DC voltage
- Embed in electrical circuits as power supplies
► Specifications
- Voltage on AC 220V
- Output voltage DC 12V
- Frequency 50 Hz
► Advantages and disadvantages of electrical circuits
1. Advantages
- Lightweight, easy to do, easy to draw.
- Low assembly cost.
- High stability.
2. Cons.
- Non-isolated circuit, prone to shock when used.
- Small current, limited application range.
- The output voltage is not flat and varies with the input voltage.
► Calculation
- We rely on experiments or can calculate in the following way:
For example, we need to calculate to get the output voltage is 12VDC, current is 10mA
- From the required current is 10mA, we can calculate Rc = 220 / 0.01 = 22K
Which Rc = 1 / (2 * Pi * f * C)
In which: Pi = 3.14
f = 50Hz (Grid frequency)
C = value of capacitor C2 to be searched.
Inferred: C = 1 / (2 * Pi * f * Rc) = 1 / (2 * 3.14 * 50 * 22 * ​​10 ^ 3) = 145nF.
But in fact there is no capacitor value of 145nF so we choose the capacitor with the nearest value of 220nF.
► Music source used in videos
- Alan Walker - Fade (NCS Release)
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