DIY Lab Bench Power Supply

DIY Lab Bench Power Supply

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Language: English

Type: Robot

Number of phrases: 106

Number of words: 790

Number of symbols: 3242

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00:00
a bench power supply is necessary when working with electronics nowadays I'm using this variable bench power supply but those can be expensive and if you only need the common 3.3 volts 5 volts or 12 volts there is a cheap and efficient solution you can convert a regular ATX power supply of any computer in a bench power supply with only a few components and solder I actually use one of those before I got my variable 1 and it even can deliver more current than
00:30
the variable one but - kind of beat up because I like to play with film buyer and even somebody named John Mullen ders asked me to make a video about it so I guess I gotta do it now first things first what do we need firstly six binding posts four or five voltage rails and one ground rail I'm going to connect positive three point three five and twelve volts and negative five and twelve volts if you don't need the negative voltage rail you can just
01:16
ignore that part one little switch for turning it on and off obviously one three millimeter green LED and one three millimeter red LED with current limiting resistors of course around 220 ohms each should be fine and in addition some shrinking tube to protect the connections as you can see I already did the first step on my power supply I already drilled all the necessary holes for the binding post and the switch those two holes for the LEDs we are already in place and the big hole was
01:48
also already there I call it the suicide hole it's time to open the supply but I warn you that we are working with higher voltage that can kill you so don't act stupid and always be careful on the inside you can see that are already cut my wires to a shorter length you have to do that with your wires as well firstly I mounted the binding post the switch and the LEDs inside the case
02:32
I sold up the resistor to the anode of the LEDs and used shrinking tube to protect the connections the colors of the wires tells us what it represents and normally you can find a charge on the supply which explains it as well orange is 3.3 volts red 5 volts yellow 12 volts white negative 5 volts bloom
03:05
negative 12 volts and black ground now I strip the isolation of all those wires and solder them to the binding post you can choose the order by yourself and remember to use shrinking tube as often as possible but don't sort off for black ground wires and one red 5 volt wire to the binding post now we have to find out whether the power supply has most of its power on the 5 volts and 3.3 volt rail
03:38
or the 12 volt rail in my case because this is an old one it's deep 5 volt and 3.3 volt rail so I'm gonna save one more red 5 volt wire for later if your supply has most of the power on the 12 volt rail then save one yellow wire for later okay the binding posts are done now we connect the purple 5 volt standby wire to the resistor of the red LED and ground to the negative side of the LED the one extra red wire connects to the
04:10
resistor of the green LED and ground as well to the negative side of the LED the green power on wire connects to one side of the switch and the ground wire to the other side okay almost done remember the extra wire we saved depending on where the mouse power is we need to put some dummy load on the supplier to keep it stable when we only need small amounts of current if you use the 5 volt rail then use a 5 ohms at least 5 watts resistor with 12 volts
04:42
I recommend 24 ohms and also 5 watts resistor I use 2 10 ohm resistors in parallel connect the 5 or 12 volt wire to one side and go into the other try to keep it safe with shrinking tube or tape and that's it here I'm testing whether all binding posts deliver the correct voltage and everything seems correct the really nice thing about those binding posters that you can also just put a bare wire in this little hole and screw
05:17
it tight I hope you liked the video if so don't forget to Like share subscribe and be sure to leave suggestions for next project and the comment section and I will see you next time

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