Preliminary study on Electric Race (I.)--sine wave, square wave, sawtooth wave conversion

First, the topic requirements:

1. Use 555 to make pulse square wave

2, using TL084 op amp to make square and sawtooth waves

3, using TLM314 voltage regulator to do DC bias

4, the square wave requires peak-to-peak 1V, sine wave demand peak of 0~2v, sawtooth wave demand peak-to-peak of 1V.

Second, the problem solving process 1, using 555 to make the Pulse square wave (1) parameter calculation

(2) Simulation design diagram:

(3) Simulation waveform

(4) Experience summarized in practical operation

A, a sliding rheostat is very important, we need to buy one, at the time of the formal competition. (If you're going to play, we'll buy one or make a test case)

B, although said, built Schmidt trigger, can make the square wave symmetry, but the actual operation of the time, found that there is no symmetry, which can be exported by the diagram:

Because the charge and discharge time is not the same, this makes me very confused, obviously only a resistor

But we can obviously improve this situation by adding a grounding resistor at the voltage control end, but there is nothing more necessary than changing 555 to a multi-harmonic trigger.

(5) Adjustment of amplitude:

We can use op amp to zoom in, or to use a resistor for sub-voltage, in this problem, I strongly recommend or, the power supply voltage is the same as 12V, this way, only with the resistance of the pressure to get the desired waveform

2, TL084 make Sine wave (1) Simulation design diagram:

(2) Parameter calculation

(3) Simulation waveform diagram

Lessons learned: The importance of sliding varistors.

3, to the sine Wave superposition DC component (1) Simulation diagram

(2) Waveform diagram

(3) Important parameter design

A TL431 such an approach will produce a 2.5V voltage at both ends of the R7, with this constant voltage reference for the design of voltages,

B op amp design, be sure to remember to input both ends of the load symmetry

4, sine wave to sawtooth wave

Preliminary study on Electric Race (I.)--sine wave, square wave, sawtooth wave conversion