I am trying to build an amplifier using op amp 741. But I am failing to build it on breadboard. I am connecting the positive end of a 9 V battery to pin 7 and negative end to pin 4. As per my knowledge and instructions available all over the internet. Pin 3 is to be connected with the input. The voltage source that I want to amplify has two leads coming out of it positive and negative. If I connect positive lead of my input to pin 3, where should I connect the negative lead?? Similarly, while measuring the amplified output from pin 6 what should be the other point of reference. I am need of a circuit fix. I am attaching the pic of the amplifier connections here. Your help will be really appreciated.
An op-amp is a building block of a working amplifier. It's not what you want in and of itself.
Here's the short story:
- Use two 9V batteries, for a +9V supply and a -9V supply. You don't have to run "ground" to the op-amp, although you can, depending on the circuit.
- Read this page. I can't recommend it very strongly -- it's in the top five things that popped up when I searched for "differential amplifier". But it should give you some guidance about what to do with your op-amp in the circuit.
- Using a 741 op-amp is like using a Model T Ford. They're interesting antiques, nice to have in a museum, but you wouldn't want to use one every day. There are much better op-amps these days. There were much better op-amps 30 years ago. I doubt that 741's are finding their way into new designs by anyone other than hobbyists.