transformerless supply based led lamp

241

05:05:46

It is a basic circuit to create a led lamp without transformer in which capacitor at input changes the current and resistor at output changes the voltage. The other resistor and capacitor are the protection circuit.

published 12 years ago

hurz

12 years ago

needs at least a 12Watt 1kOhm resistor!

rbrtkurtz

12 years ago

Well, if you set the voltage the proper peak voltage, not rms, that resistor sees 157mA at 161V. That's 25W.

hurz

12 years ago

I giveup to tell users.... just concentrating on power disipation and if i see they start to think about then tell them the voltage is wrong. But most dont care anyway

rbrtkurtz

12 years ago

Screw it. Use a 1/4W. Have fun!

hurz

12 years ago

??? Dont get it, you recommand 1/4Watt, or you need a screw ???

hurz

12 years ago

@rbrtkurtz, you see electronicsbuzz dont care what we told him at all. The bad thing is his description which reads for unexpirienced users like he know what he is doing.

rbrtkurtz

12 years ago

1) Screw the 1/4W resistor to threw PCB. 2) I'll give him the benefit and dune he hasn't checked yet.

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