piclist 2001\03\23\070645a >
Thread: 120AC to 5V no transformer
www.piclist.com/techref/power.htm?key=transformer
flavicon
face BY : mikeTakeThisOuT@EraseMEwhitewing.co.uk



On Thu, 22 Mar 2001 22:44:47 -0500, you wrote:

{Quote hidden}

That would be a rather big resistor - it would dissipate 14 watts, and
the regulator another 2W - that's a LOT of heat.
You could us a capacitive dropper, but you're looking at a few uF,
which is big and expensive (more so than a small transformer)
>>What about isolation issues?
>
>That's the price you pay! If you don't want a transformer, you don't get
>the isolation. Make sure you have a fuse on the mains side (input to bridge).
>
>>Lots of issues here I am sure.
>
>Not really: just the lack of isolation and the maximum power/current
>through the zener.
oh, and heat!
>================================================================
>Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: KILLspamralspamspam.....lcfltd.com
>Least Cost Formulations, Ltd.            URL: http://lcfltd.com/
>824 Timberlake Drive                     Tel: 757-467-0954
>Virginia Beach, VA 23464-3239            Fax: 757-467-2947
>
>"Vere scire est per causas scire"
>================================================================

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


<t29mbtkm90hiifcnes8kaupokk1asrjeuu@4ax.com> quoted-printable

In reply to: <4.3.2.7.2.20010322224034.00d5bf00@mailhub.exis.net>
See also: www.piclist.com/techref/power.htm?key=transformer
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) 120AC to 5V no transformer

month overview.

new search...