Need help with JFE2140 single-ended input low-noise amplifier circuit.

FireRain111

Can someone help me figure out why my circuit board, which I copied, isn't working?

maychang

Why doesn't my circuit board, which I copied from this model, work?

I didn't see any errors in the circuit.

This circuit looks like an audio amplifier circuit.

As for why the circuit board doesn't work after being printed, that's hard to say. A damaged component or device will cause the circuit to stop working, an inadequate power supply will also cause it to stop working, and an error in the circuit board design will also prevent it from working.

maychang

I can offer some advice:

Do not imitate the typical application circuits given in the chip's datasheet. Instead, design the circuit according to your own requirements and select appropriate components.

The circuit board is already installed and soldered. Before powering it on for testing, the load must be connected. The first step is to use a multimeter to check the power supply voltage and the DC voltage at various points in the circuit. The second step is to connect a signal source and use an oscilloscope to check the input and output waveforms.