Hello Piclisters!

     This is my first post in six months. I had serious
(incompatibility?) problems with my email accounts and the MIT server.

Jan-Erik Soderholm XA wrote:
 >>Just come across some linear voltage regulators
 >>from ST Microelectronics called VB408 and VB409.
 >>They have a high input voltage range (400 and 580V),
 >>so they can be connected directly to rectified 110
 >>or 220 V mains. They deliver a max of 40 or 80mA, so
 >>could easily feed a simple PIC circuit.
 >>http://us.st.com/stonline/books/pdf/docs/6421.pdf
 >>http://us.st.com/stonline/books/pdf/docs/6941.pdf

     I haven't used this wondies yet, but it seens great. I hope to buy
some of then very soon to make some tests. It seens the ideal solution
for powering some small gadgets I'm still working on.

Bob Ammerman wrote:
> If Vin - Vout = 400V then you have
> 80ma * 400V
> = 32 watts
> This will take quite a heatsink!

     No, because they aren't linear voltage regulators. If you take a
look at the datasheet you will understand. They only conduct part of the
mains sinusoid close to zero.

     Best regards,

     Brusque

--
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Edson Brusque                     C.I.Tronics Lighting Designers Ltda
Research and Development                   Blumenau  -  SC  -  Brazil
http://www.suporte.ind.br/ryan/netiqueta.htm     www.citronics.com.br
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