Introduction: Simple Adjustable Switching Mode Power Supply

Picture of Simple Adjustable Switching Mode Power Supply

Hello guys and girls!

I built this simple adjustable switching mode power supply and i wanted to share with everyone!

WARNING! THIS PROJECT WORKS WITH HIGH VOLTAGE!

Operating voltage: 85 V - 250 V

Output power: 9w (Absolut max: 10w) (with tny267, tny268 is more powerful)

You can see on the image i power up my SMPS with low voltage DC but i works with 230V AC

Lets Start!

Step 1: Buy Your Parts!

This project need a lot of part, be carefull order all! If you dont put in part in, it can be your last mistake!

You will need:

Resistors:

1x: 1M ohm resistor

1x: 6.5K ohm resistor

2x: 100ohm resistor

3x: 10k resistor (number of your outputs -1! if you have 3 outputs then 3-1 = 2, why -1?: this resistors discharge the capacitors so you will se the change in the voltage when you adjust it.)

1x: 1k potmeter (adjust the voltage and discharge the capacitor)

Capacitors:

1x: 0.22u capacitor, voltage: 250V

1x: 22u capacitor, voltage: 400V

1x: 4.7nf capacitor, voltage: 1kV

1x: 0.1u capacitor, voltage: ~50V (you can put this cap to every output too!)

1x: 47u capacitor, voltage: 25V

Filter capacitors at the output (100u - 2200u)

Diodes:

1x: Diode bridge (you can build it with 4 diode, BE CAREFUL CHOSE THE RIGHT VOLTAGE!)

1x: high frequency switching diode with high voltage (D5)

1x: rectifier diode to the outputs (fast, and more then 1A)

Chip:

1x: TNY267/268/266 chip (order 2... no over-current protection. if you overload the chip, it can blow up!)

Optocoupler:

1x: optocoupler (can be any optocoupler)

Inductors:

To filter the output you will need inductors... you can use any inductor

Fuse:

1x: 600mA-1A fuse

Transformer:

Normally you cant just buy one, get a broken pc power supply or a monitor power supply from a broken LCD monitor and desolder the transformer.. Be carefull, transformer have a secondary and a primary winding! if you need help to identify the transformer write a comment and send me a photo from the transformer (top, bottom) and if you can measure a resistance and write down

Step 2: Build the Circuit!

Picture of Build the Circuit!

BE CAREFULL! 230V CAN KILL YOU! IF YOU ARE BEGINNER AND NOBODY HELP YOU DONT BUILD THIS!

Your output is at: GND and one of your outputs!

Output voltage based on your transformer.

Step 3: Success!

Picture of Success!

I hope you built the power supply and i hope you had no problems with the schematic!

I hope you enjoyed the pictures and if you had problems with the building process i hope it helped!

I powered my SMPS with low voltage DC but it works with 230V AC!

If u liked it support my at Patreon <- Click dat!

Comments

Swansong (author)2017-02-27

Looks good, thanks for sharing :)

About This Instructable

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Bio: Hello everybody! Im from hungary and im 14 years old. I post new project on every week. I learn the language so if i write ... More »
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