Introduction: 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
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:
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)
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)
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)
1x: TNY267/268/266 chip (order 2... no over-current protection. if you overload the chip, it can blow up!)
1x: optocoupler (can be any optocoupler)
To filter the output you will need inductors... you can use any inductor
1x: 600mA-1A fuse
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!
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!
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!
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Please be positive and constructive.