lm318n as noninverting amplifier
The LM318 is quite a lively amplifier.

As a minimum, you need to make the following changes

a) Bypass the power supplies close to the package with small value capacitors
b) Raise the feedback resistor values, 100ohms is too low
c) Provide a DC bias path to your amplifier input
d) Decouple the transducer input







simulate this circuit &ndash; Schematic created using CircuitLab

While the data sheet says this amplifier will be stable at unity gain, so more stable at the gain of two here, all that will be for naught if you've built a bird's nest on a proto-board.

A good way to get oscillatory performance out of an otherwise good amplifier is to drive a pure capacitive load with it, like a coaxial cable into an oscilloscope. Decouple the output with a few 10s of ohms series resistor (R4) so the amplifier isn't driving the capacitance directly.

The data sheet does talk about stability modifications you can make with extra capacitors connected to pins not shown on this simple schematic. If you are still having problems, read these parts carefully.

Excess capacitance to ground at the amplifier -ve input, through perhaps a bird's nest board, or bad PCB layout, can also destabilise an amplifier. A few 10s of pF placed across R1 (C4) can sometimes restore stability in these cases.

If R3 is too low a value for your transducer, check the amplifier data sheet to see how high a value you can use. It is possible to bootstrap this resistor to reduce the loading if needed. Although unlikely to be necessary at this low gain, a capacitor in series with R2 reduces the DC gain of the amplifier to unity, to allow a large input offset voltage due to a large R3 value to be tolerated.