Transformerless ac to dc

271

03:34:27

this is a test circuit for an arduino powered bench power supply. This will be on the high side of the power supply.

published 9 years ago

BillyT

9 years ago

As they say on TV, don't try this at home. There are at least three reasons for this statement, 1. Almost any component going high resistant or open circuit will leave you with mains on the output. 2. It's hard to reduce the voltage and get any type of current in a circuit like this. 3. The price of capacitors alone would fund a battery saver that could then be used as a power source for a programmable power supply.

Emilyram86

9 years ago

can I still use it even with a choke?

Emilyram86

9 years ago

or isolation?

BillyT

9 years ago

A switch mode circuit, with proper fail safes could get away with it, in theory you can work that line. Until proficiency is reached at that level, do be very, very careful, because as long as the higher voltage is there, there is always the risk that it will get through. With a series regulating power supply, if you start with a lower voltage it means there is less to get rid of (normally wasted as heat), making it easier to regulate and gives it higher current capabilities.

faceblast

9 years ago

6W🔥 across the resistor. these circuits kill people. there are plenty of better, safer alternatives. just buy a battery charger and a bag of nimh batteries to run your arduino. it's safe and it's portable.

BillyT

9 years ago

@faceblast, I concur. But if they want to build a power supply, series regulator that can be powered off a wall wart is a better alternative.

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