If you are trying to save space you're on a loser here.  The 600V+ rated
capacitor required to give >100mA in a transformerless power supply is
*MUCH* bigger than than a transformer.  *AND* about twice the price.

Bye.

-----Original Message-----
From: Alexandre Domingos F. Souza [mailto:taito@TERRA.COM.BR]
Sent: Thursday, 26 July 2001 10:53
To: PICLIST@MITVMA.MIT.EDU
Subject: Transformerless PSU


        Dear guys,

        I think it's a basic one, but maybe fits the list

        I designed a circuit with a PIC (12C508) that turns on and off a
relay, controlled by an external source. The power to this circuit (around
120mA) is a small transformer. I'd like to build a transformerless PSU into
this circuit. But EVERY scheme I found on the internet was unusable. I saw
something on the Embeeded Control Handbook from Microchip, but it only goes
to (if I'm not mistaken) 45 mA. Maybe someone can help me to develop (or at
least learn to) a simple transformerless PSU that can give me 12vcc / 120
mA???

        Thanks for any info! :o)


---8<---Corte aqui---8<----

Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

---8<---Corte aqui---8<----

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