120AC to 5V no transformer
On Thu, 22 Mar 2001 22:07:53 -0500, you wrote:
>Can you make a power supply that outputs 5V at 50-100ma that connects to 120AC line with no transformer, the idea needed is for a very cheap device. It would need to be at least CSA/UL approvable.
>What comes to mind is a cheap 100ma 78L05 5V reg, but whats needed between it and the AC?
>What about isolation issues?
>Lots of issues here I am sure.
At this current level a transformerless PSU is not really practical -
small transformers are very cheap, and will be cheaper than any other
method except maybe a HUGE resistor and a lot of heat.
Using a transformer will also save a lot of approval costs.
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In reply to: <20010323030538.YCDZ29886.femail2.rdc1.on.home.com@CR677381-A>
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