klem kedidelhopper wrote:

That's very interesting about the 500 ohm pot. I've never heard of
doing that before. I would have thought that the regulated voltage
would have been dictated by some internal zener diode or something.
But in any case I have a bag of 7805's and I'm going to experiment
with them. As far as the capacitors go are you talking about using any
additional from the usual input and output caps? Lenny.


Here is the datasheet on that family of regulators. the first page
shows 'Adjustable Output Regulator' and that you need a fixed resistor
from output to common, along with the pot from common to ground.

http://www.national.com/ds/LM/LM340.pdf

Texas Instruments UA7824CKC is 1.5A

Mouser has several 1.5A types in stock:
http://www.mouser.com/Semiconductors/Integrated-Circuits-ICs/_/N-6j73k?Keyword=7824&FS=True
starting at 47 cents each, which is only seven cents more than the 1A
types. They are $4.56 for ten or $43.70 per hundred. this is for the
511-L7824ACV made by STMicroelectronics. The right part is cheaper than
screwing around with extra resistors & pots that can go open.

http://www.mouser.com/ProductDetail/STMicroelectronics/L7824ACV/?qs=sGAEpiMZZMtOXy69nW9rM5taedogOtNRM5vVsMlyJSo%3d


The description column list the output of each part.


--
You can't have a sense of humor, if you have no sense.