LM107 OpAmp & LM338 Voltage Regulator

[Dave_W_Cooksey]

Hi i need:

1- LM107 Op-Amp
2- LM338 Voltage Regulator
1- 2 Watt Reostat

if any one has these items for sale let me know please

David

[TinselKoala]

Hi i need:

1- LM107 Op-Amp
2- LM338 Voltage Regulator
1- 2 Watt Reostat

if any one has these items for sale let me know please

David

The 338 comes in either the TO-3 case (LM338K) or the TO-220 package (LM338T). Which do you need?

DigiKey lists the LM338K for $32.37 ea. and the LM338T for $2.70 ea.
Both are rated 5 amps, so unless you really need the TO-3 package for some reason, the TO-220 will really save some bucks.

The LM107 is available in a can or a DIP, and crosses to (LM107H) MC1741, and (LM107L) MC174. Do you need a specific package, or will either one do? Do you need the freq-compensated version?

And generally when ordering Rheostats one would like to know the Resistance rating as well as the power handling capacity.

[poynt99]

There are much better pin for pin replacements (dozens) for the old LM107 / MC1741. Why would you want this one specifically? What is your application?

Buy the LM338T from Digikey as TK suggested.

.99

[Dave_W_Cooksey]

Hi guys here is the drawing i am trying to put together
i found this drawing on the net and wanted to build it,
yes i am looking for those TO-220's

Nothing even mentioned about the input voltage was included
w/ the drawing.

What im trying todo is be able to light up 2- M16 12V 55Watt
Lights

55 watts / 12v = 4.583 amps * 2 = 9.166 amps

For the LM107 i was thinking the 8 pin model
Need a LM107H,  MC1741, or MC174

Reostat  2watt 2K

[derricka]

This circuit appears to be an adjustable voltage regulator, with a set 10 Amp limit.  If you just want to power a pair of lights, from mains power, this circuit alone is not enough (you would still need an unregulated DC power supply to feed this circuit). But unless you require adjustable brightness, or extreme brightness stability, this circuit is both overkill, and waste-full.  If you just need basic illumination, all you need is a transformer, 12 VAC output rated at 12 Amps (or more)  M-16 halogen bulbs don't mind AC.  Another option is to use a small switching power supply (available from many lighting shops), intended to power 12V Halogen bulbs. These are small, light, and highly efficient.