i have a design that calls for a lm308 opamp, but thus opamp is discontinued, so i was wondering if there is another opamp that i can use in its place, from what i can tell the only important things are to keep the same open loop gain and it needs to work at +-9v supplys. Thanks for any help
2007-06-17 14:45:42 · 3 answers · asked by zapppp 2 in Science & Mathematics ➔ Engineering
Contact the folks at National Semiconductor www.national.com and tell them your opreating paramaters and ask them. Theyv'e got a good op-amp selector page at http://www.national.com/appinfo/amps/amplifiers_selection_guide.html which will help you pick an op-amp that will work in your situation.
2007-06-17 14:51:28 · answer #1 · answered by John 4 · 0⤊ 0⤋
The great thing about op-amps is that they have very large open loop gains. This makes the feedback circuit the important part of the circuit, and usually the open loop gain isn't important. The most important thing to watch for is frequency stability. The gain changes with frequency and you want to be sure your feedback circuit will provide a stable circuit at all frequencies.
2007-06-21 11:24:13 · answer #2 · answered by Bob_B 1 · 0⤊ 0⤋
The '308 is a fairly general purpose op-amp. For the last several years I've been using the TL081 (single), TL082(dual), and TL084(quad) op-amps from Texas Instruments. They seem to work quite well and they're --inexpensive-- ☺
Get a data sheet at TI's website and you can buy parts at DigiKey, Mouser, etc. etc.
Doug
2007-06-17 15:38:02 · answer #3 · answered by doug_donaghue 7 · 2⤊ 0⤋