[time-nuts] Switching regulator 12 > 4 V (3.3)

[jimlux]

On 12/4/16 11:46 AM, KA2WEU--- via time-nuts wrote:
> Who has a good recommendation for a switching power supply circuit, 12V DC
> in, 4 V/ 500mA out , Exactly 3.3 for IC voltage.
>
do you need 4V or 3.3V?

I'd start with one of the modular parts we've been discussing.  They 
typically have 9-18V input range and whatever you want out.

Since I have the Mouser search page up, P78A03-0500 is $3.71 in qty 1, 
3.3V out @ 0.5A, 6-28V in.  ABout 85% efficient