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Transformerless Switch Mode Power Supply Circuit
By Jestine Yong on July 4, 2011
This website was recommended by Beh about "Transformerless Switch Mode Power Supply Circuit". If this circuit/IC can be further improve then in the future we may not need transformer to get the secondary output voltages. Manufacturers could save the cost of not using the transformer and electronic components. The troubleshooting could be much easier too. Please click on the above photo for more information:
Likes(19)Dislikes(1)
bijoy
July 13, 2011 at 11:51 pm
thank you
bijoy India kerala(gods own country)
mohamamad jusuf
July 16, 2011 at 9:32 am
Thank you your diagram that I will to make this circuit....
Amir Mukhtar
July 20, 2011 at 4:12 am
Sir,
Transformerless power supply diagram is useful but please express some more information about to increase power output and voltages upto 36 volts and 1500 mili Amperes.
iam very thanksful to you in this regards.
A student
Amir Mukhtar
admin
July 20, 2011 at 7:25 am
HI Amir,
It all depends on the ability of the IC and the circuit. If the manufacturer produce many different type of similar ICs as above i don't see why your request cannot be done.
Jestine
Sagar
August 28, 2011 at 1:25 am
My smps is not working how to check it, solution to repair it
admin
August 29, 2011 at 9:14 pm
Hi Sagar,
May i know what are the components you have checked? Did you get any supply voltage to the power ic?
Jestine
werdan
December 28, 2016 at 10:00 am
Good day! puzzled regarding p/b led TV, it was a/c input with rectifier bridge but output reads 1000 volts with a capacitor 450v/68mf, is it normal, what was the causes of getting more than capacitor rating?
Jestine Yong
December 28, 2016 at 3:24 pm
Hi Werden,
If more than a 1000 volt, the cap already blown. How do you test the cap?
Jestine
ali
September 8, 2011 at 1:57 pm
really it was to hard for me to get your website
cause i have alot of questions first of all let me itroduce
my self.iam ali from yemen ihope u heard about it
and working as a photocopiers tech.so pls accept me as a begainner
admin
September 8, 2011 at 9:15 pm
HI Ali,
You are welcome to this blog.
Jestine
M Shahbaz khan
November 17, 2011 at 12:23 pm
HI
Dear
I need the chooper circuit diagram of the fixed 24 volt and 6 Amp circuit.
If any one can designe the required circuit so contact with me.
Circuite detail is as below.
chooper circuit diagram
Input voltage 210 to 240 volt AC
Constant 24 Volts DC 6 Amp
Thanks
M Shahbaz Khan
admin
November 18, 2011 at 5:01 am
Hi Shahbaz,
Sorry i do not such diagram.
jestine
Leo
November 24, 2011 at 3:15 pm
Transformerless PSU is good for some systems. Those systems that the user cannot touch the conductors...
This type of PSU, as you can see in the schematic, isn't isolated from the high voltage mains. If ever the user touches any conductor while his/her body is in contact with the ground(earth), the user has a very high tendency to be electrocuted.
The transformer on PSU's doesn't only serve to step up/down the voltage, but serves as isolation as well.
admin
November 28, 2011 at 5:23 am
Hi Leo,
You are right and thanks for the comment!
Jestine
Mamade Ibrahim Joomun
March 22, 2012 at 11:29 am
Hi Jestine,
I would like to know if you have a circuit diagram for:
Input voltage 50 to 440 volt AC
Constant 5 or 12 Volts DC 100mA.
Thanks
M I Joomun
Jestine Yong
March 22, 2012 at 8:56 pm
Hi Mamade,
Sorry I do not keep circuit diagram.
Jestine
GIrma Assefa
July 14, 2012 at 8:34 am
Hi jestine i am from addis ababa Ethiopia .
I am reading ur news letter & bouneses it is very important to me & i use it as manual thanks to u especially about LCD repairing & power supply throubleshooting i thanks u from my heart .mr.jestine in my country there no on line bussines opportunity that is why things littele dificult to buy ur books & diffrent testers.I trying via USA to communicate u and send money to u well send me the thinks which i need.
Thanks Jestine keep intouch Girma Assefa
Electrical & hardware Engineer
Jestine Yong
July 14, 2012 at 9:43 pm
Hi Girma,
You are welcome and in fact you can use money gram services to send me money to buy my products.
Jestine
Rahul
October 7, 2012 at 1:13 am
Sir Please Tell me about efficiency of the above main circuit.
& please describe the efficiency calculation & also the power factor & ripples calculation... Thanks.
Jestine Yong
October 8, 2012 at 11:05 pm
Hi Rahul,
I suggest that you email the owner in the link below for more information:
http://www.circuitstoday.com/transformerless-switch-mode-power-supply-circuit
Jestine
dbgrg
December 18, 2012 at 1:57 am
hi justine Young,
I want to construct 12 volt power supply with auto cutoff.but how to start.please help me
Jestine Yong
December 18, 2012 at 6:42 am
Hi Dbgrg,
Sorry I'm not into electronics design thus I can't give any advice on this.
Jestine
raymundo saura
October 19, 2013 at 5:10 pm
Great info thanks and GOD bless
Gurpreet
July 31, 2015 at 3:04 pm
Hello Mr. Yong
Thanks for sharing information with us.
Thanks
Gurpreet
Jestine Yong
July 31, 2015 at 9:34 pm
HI Gurpreet,
You are welcome.
Jestine