1. Make an experimental scheme according to the design scheme.

2. After the design scheme is given, it is necessary to use multism for simulation test and give the test data.

3. Compare the design parameters with the simulation parameters, process and analyze the experimental data, and give the conclusion.

Second, the principle of amplification shaping circuit:

Because the amplitude and frequency of the signal to be measured and the type of signal wave are unknown, in order to measure the frequency correctly, the signal to be measured must be amplified and shaped into a pulse wave with an amplitude of 3-5V.

Three, amplification and shaping circuit schematic diagram: