Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!uw-entropy!dataio!pilchuck!ssc!markz
From: markz@ssc.UUCP (Mark Zenier)
Newsgroups: sci.electronics
Subject: Re: low-current power supplies
Message-ID: <505@ssc.UUCP>
Date: 23 Feb 90 21:03:27 GMT
References: <2588@scorn.sco.COM>
Distribution: usa
Organization: SSC, Inc., Seattle, WA
Lines: 20

In article <2588@scorn.sco.COM>, johnd@sco.COM (John DuBois) writes:
> 
>      I often have need of a low voltage (typically 12V or so), low current (up
> to 20mA or so) DC power supply for some circuit.  
...
>      My question is, is there a better way of doing this?  Are there any 
> power supply chips that run directly off of 120VAC, and if so, what technique
> do they use for voltage drop?  
...
>      I'm not worried about the power supply output being hot; most of the
> circuits would need to be hot anyway (AC load controllers).  The main
> considerations here are size and cost.

Maxim makes some 8 pin minidip 120 vac to 5 Vdc power supply chips.

Max610, 611, 612.  Active has them in the catalog for $3.70 - $3.85.

I think they use a capacitor as the dropping element.

markz@ssc.uucp