[R-390] OT: 30V regulator?

[Steve Byan]

On Sep 17, 2007, at 2:17 PM, Barry wrote:

> I was thinking of a 24VAC xfmr with a full-wave bridge, a cap, and  
> possibly a 3-terminal regulator but didn't know if a 30V 3-terminal  
> regulator is available.

The LM317 will handle up to 40 volts on the input, and can be  
configured to supply 30 volts. If the unregulated input is above 30  
volts, then you'll need an LM317HV.

There may be newer parts that are better, but the LM317 should work  
and is readily available. The 317HV might be hard to find.

>   Also, would like to make a 1.5V power supply for the D cell, but  
> not sure if a 1 or 1.5 xfmr could be had as well as whether a 1.5V  
> regulator is available.

The LM317 will go down to 1.5 volts.

Regards,
-Steve

-- 
Steve Byan <stevebyan at mac.com>
Littleton, MA 01460