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DIY LM2596 Adjustable Voltage Regulator Switching Power Supply Module Kits Step Down Converter Power Supply DIY Kits

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It can input non-stable alternating current and output adjustable voltage. Its minimum output voltage is 1.23V and the maximum output current is 3A. LM2596 contains fixed frequency oscillator (150KHz) and benchmark voltage stabilizer (1.23 V), and has perfect protection circuit, current limit, heat cut-off circuit and so on. This circuit has the advantages of high efficiency and low heat. It can make full use of the various idle transformers around you to make the stable voltage stable power supply.

Working Voltage:
LM2596 is the switch of voltage stabilizer and step down circuit. Please ensure that the input voltage is higher than the output voltage. The general input is 3.2V - 40V, and output is 1.23V-35V.

Circuit Principle:
The non-stationary AC voltage input of J1 was rectified by d1-d4, C1 and C2 filtered as the input voltage of LM2596 output the stable DC voltage from J2 through the LM2596. C3, C4 is the output filter capacitance. R2 and LED2 constitute the indicator circuit. LED1 is 8mm white LED. Its brightness can roughly indicate the output voltage. If the brightness is too bright, you can increase the resistance of R2 properly. L1 is a special inductance, which acts as an energy conversion. D5 is the Schottky diode, which plays a continuous role in the circuit. C5 interferes the circuit. The output voltage of R1 and W1 can be calculated by the following formula: Vo=1.23(1+W1/R1)

Circuit Diagram:

Component Listing:

NO. Component Name PCB Marker Parameter QTY
1 Electrolytic Capacitor C1 1000uf 35V 1
2 Electrolytic Capacitor C3 220uf 25V 1
3 Ceramic Capacitor C2,C4 0.1uf 104 2
4 Ceramic Capacitor C5 3300pf 332 1
5 LED LED1   1
6 LM2596S-ADJ IC1 TO-263 1
7 1N5822 D5 SS34 1
8 1N4007 D1-D4   4
9 Fuse BX   1
10 Metal Film Resistor R1 510ohm 1
11 Metal Film Resistor R2 1K 1
12 Inductance L1 30uH 1
13 Potentiometer W1 10K 1
14 Knob cap     1
15 Terminal   2P 2
16 PCB   37*46mm 1

I. Tested by ICStation's Outstanding Partner arduinoLab:

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(The language in the video is Russian)

II. Tested by ICStation's Outstanding Partner bzoli5706:

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(The language in the video is English)


III. Tested by ICStation's Outstanding Partner Blue Matter:

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(The language in the video is Italian)

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DIY LM2596 Adjustable Voltage Regulator Switching Power Supply Module Kits Step Down Converter Power Supply DIY Kits