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How can design a cheapest power supply

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bluethunder7000

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HI everyone


I need to design a transformerless power supply, the input voltage 220Vac and the output voltage 24Vdc and 5Vdc with max. output current 200mA with out put any transformerless so i appreciate any one can help me

thanks
 

Cheapest often means VOLUME .What is yours ? .Also what is cheapest ?
$1 or $2 .In volume you can get from china great deals .
depending once again yoour volume.
 

Attached is an example of a transform;ess power supply.
For 24V and for 5V you will need to change values of some components ..
For example, you can remove R1 from the circuit, and for 200mA and 230V the value of the capacitor C1 will be roughly 2.7µF .. (Zc=1/2ΠfC)
Regards,
IanP
 

this (IanP) circuit can be used but you have many disadvantages like no isolation, dangerous voltage, the resistor R1 dissipates lot of power as heat and efficiency is also very less :(

Check out this product :idea: it will be compact

**broken link removed**

**broken link removed**

:)
 

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