Simple 5V 1A Switching regulator by IC LM2575-5.0
Power supply
The switching regulator which used LM2575-5.0 in this page. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x The output current) is consumed as the heat with the regulator. Because it is, the efficiency isn’t good. Data sheet for LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator Source : https://www.interq.or.jp/japan/se-inoue/e_ckt22.htm https://www.national.com/pf/LM/LM2575.htm Related Links 5V power supply using lm2575 …
Many Constant current source circuits
Power supply
      Sometimes we need a constant supply to the load.To prevent damage to the load.For example, when we apply a voltage that ever-changing to LEDs. However,LED needs to have the constant current and voltage. As usual, we provide current limiting resistor to it. But this works we can not use because the input voltage changes all time. We must make a constant current through the LED. If you do not understand. Try to preview the circuit below. The Safe constant current source.       Figure 1 the below is a Safe constant-current source circuit, how it works?       A cmos op-amp (number ICL 7611) …
0-30V 3A Adjustable DC Supply
Power supply
This is cheap adjustable 0-30V 3A Laboratory DC Power Supply circuit. It is high efficiency regulator circuit by using IC regulator UA723 and TIP3055 as power transistor so easy to install. It is designed to protect over current load maximum 3A Technical data -Need to use transformer : 12-0-12V 4A. -Voltage output adjustable : 0-30VDC -Current maximum : 3A How does it works As Figure 1 circuit diagram. AC from transformer goes through bridge rectifier diode set which compress of 4 bridge diode changing AC to DC by having C1 as a filter before sending to regulator circuit. Parallel R …
Simple 12V 2A DC power supply
Power supply
Today, my son builds a simple 12V 2A DC power supply for a 12V solar pump. It is an Unregulated power supply because load is DC motor only. Note: More circuits 12V Power Supply How to works I teach son to understand the working principle of this projects. The main principle, we use this project to reduce voltage from AC-line 220V to 12V DC. On Figure 1 The AC 220V 50HZ is connected to the circuit through S1- ON-OFF switch and F1-fuse to protect this circuit. Then they flows through a 2A transformer to reduce voltage into 12V AC. Next,through …