In article ,
mentioned...
On Mon, 29 Dec 2003 09:28:53 -0800, Watson A.Name - "Watt Sun, Dark
Remover" wrote:


I needed to drop 1V from a 6VDC 200 mA regulated wall wart,

...


6VDC------+-----------------+
| |
[R1] |
| |
+-----|+\ C
| | ------B
| +--| / E
| | |
| +----+---------+
| |+ |
[R2] [C1] [RL]
| | |
GND-------+-------+---------+

R1/R2 = 5

C1 = Whatever you need to keep the thing from oscillating; 100µF is
probably a good guess.

Thanks, but I think someone snipped the part where I said that I was
trying to get this to fit across the pins of the RF modulator, and
that the wall wart was already regulated. I guess I could do it if it
was surface mount parts, but I'm not experienced with those. What
kind of opamp works down to only 6V? A LM358? In order to put out 5V
at the emitter, it would have to swing the base to 5.7 or more volts
at 200 mA, so the opamp would have to swing close to the positive
rail. Maybe a better idea would be to use a PNP for the emitter
follower.



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