Transformerless power supply circuit
Transformerless power supply
Description.
Here is a low cost and simple circuit that can be used to power up small electronics devices. The power is directly tapped from the mains via resistor R1.D1 rectifies the voltage and C1 and C2 are used to filter the output.The zener diode D2 keeps the voltage at steady 5V.
Transformerless Power Supply Circuit Diagram with Parts List.
Transformerless Power Supply Circuit Diagram
Notes.
- This circuit can deliver only up to 2omA ,there fore not suitable for serious circuits.
- You can use this power supply for small LED circuits etc .
- Remember you are playing with mains.Always be careful
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Hi all, Can anyone please let me know how to make 5VDC transformerless power supply to run the Wireless Light Switch Circuit. Actually I made the above shown circuit of five volt but it is not working properly with the circuit from the link below:
http://electroschematics.com/2090/wireless-light-switch/#comment-158535
Can anyone help in this regard. Please mail me to: vrndrsngh85@gmail.com
Thanks in Advances!
I want to curcuit for hum free fan curcuit diagram. Any body can help me?
Tks/Rgds
Layanal
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Hi Ramakrishna 12 volt 1amp is 12VA. The loss in the capacitor power supply around 15 watts with a shunt regulator not really worth, as the capacitor required will be 15uf 350volt AC will be costlier than the transformer. efficient way will be good switched mode power supply. convert 230VAC to DC and chop it use a PWM and covert to high frequency oscillation use a ferrite pot core transformer rectify and covert to low voltage high current power supply. losses will be the least ( the efficiency approaches 85 to 90%) Capacitance type power supplies are suitable for low current requirement only.
hi,
im rama krishna i need a ckt that provides 12 volts with 1 amp D.C output without using transformer
I’m actually converting 24vac to 5vdc (100mA needed for circuit) and found this circuit while searching for least expensive parts. This circuit is going outside in the Arizona sun (120F) so effiecincy and temps are a concern. I’ll probably go with something like the LM2574 (DC to DC Converter and Switching Regulator Chip) which seems overkill.
Thanks.
Hi John R1 can give you a maximum of 20mA only. You have to reduce R1 to 2.2K 25watts with 7805 regulator and a protective zener of 9volt 1watt before the regulator chip. i dont know whether it is a proposal worth. For high current better to switch to capacitor type.
How can I get enough 5vdc mA to power a 100mA relay? More Zener diodes in parallel? Or bigger zener?
I built this circuit and enclosed it in old Energy Saver Bulb. Mounted two White LEDs on top of the enclosure. That works fine for night light.
good anf work abel circuits
iwnt the bestr
good anf work abel circuits
Transformerless circuits for 50mA load