TransformerLess Power Supply
Transformerless power supply for low current applications. C1 is the X rated AC capacitor that reduces high volt AC. D1-D4 rectifies AC to DC and C2 removes ripples. R1 is the bleeder to remove stored current in AC when power is off. R2 limits inrush current. A Zener can be used in the output to get regulated DC.
Transformer Less Power Supply Circuit Diagram
About the author
Mr. D. Mohan Kumar M.Sc., M.Phil, is a Selection Grade Lecturer in Animal Science. He has been guiding Post Graduate students in Animal Science research for the last 25 years in several premier institutions in Kerala, India. Presently he is working in the PG department of Zoology, Govt. College for Women, Trivandrum, Kerala, India.
He is an avid electronics enthusiast and has been designing circuits for the past 20 years. In this period he has supported many electronics/electrical engineering students in their final year projects.
He is a regular contributor to Electronics For You magazine which is South Asia's largest circulating electronics magazine published from New Delhi, India.
He has agreed to write articles for electroschematics.com on a regular basis.
about 3 months ago
Pls. provide me the circuit for charging the 2.4 V rechargeable battery using resistor & capacitor, but without transformer.current is 50MA.
about 2 months ago
good day!!! can u help me with a transformerless power supply with a 6v output at 500mA….plz…thanx
about 1 month ago
It is difficult to get higher current from a transformer less power supply. Even with a 225K capacitor, maximum output current will be 100 mA. To get high current, transformer is necessary. Transformerless power supply is used to power low current circuits drawing less than 30 mA current
about 1 month ago
The same circuit can be used for recharging 2.4 volt battery. Reduce the value of C1 to 105K and fix a 3 volt zener across the output with cathode towards positive
about 2 months ago
what is the best amount of voltage and current supply of a passive infrared circuit usig M7615 as passive infrared controller??can u also email me the circuit of a suitable transformerless power supply…if u also have any circuit for a passive infrared sensor, can u also email me…..pls. reply ASAP..thanx a lot..
about 1 month ago
It is necessary to know the power rating of the M7615. It is better to use a step down transformer because Mains spikes may give false triggering in sensor circuits
about 1 week ago
Thanks for the information, its nice…
i want to modify the same circuit for the output of 12V and 2 amps…
can you please tell us the required changes in the circuit…
about 1 week ago
It is difficult to get high current from capacitor based power supply. It can give maximum 100 mA with a high value capacitor like 225K.These designs are used for low current applications.Maximum 50 volt can be obtained. For high current, transformer is necessary
about 1 week ago
D.Mohankomar,
gud day!!!
do i need to change the value if use the 110vac as an input instead of 220vac … pls advice
regrds,
czar
about 1 week ago
You need not change the values.Try with 110 v input. If the output voltage is low use 0.1 UF capacitor in the place of 225k