Triangle Wave Generator

...

[pic 12]

[pic 13]

15 to -11 Volts (1 volt steps)

14V

-12 to -14 Volts (1 volt steps)

-14V

Table 2: decreasing from 15V to -14V in 1V steps.[pic 14]

,[pic 15]

[pic 16]

[pic 17]

-15 to 5 Volts (1 volt steps)

-14V

6 to 15 Volts (1 volt steps)

14V

Table 3: increasing from -15V to 15V in 1V steps.[pic 18]

[pic 19]

[pic 20]

15 to -5 Volts (1 volt steps)

14V

-6 to -15 Volts (1 volt steps)

-14V

Table 4: decreasing from 15V to -15V in 1V steps.[pic 21]

,[pic 22]

[pic 23]

[pic 24]

-15 to 2.4 Volts (1 volt steps)

-14V

2.5 to 15 Volts (1 volt steps)

14V

Table 5: increasing from -15V to 15V in 1V steps.[pic 25]

[pic 26]

[pic 27]

15 to -2.4 Volts (1 volt steps)

14V

-2.5 to -15 Volts (1 volt steps)

-14V

Table 6: decreasing from 15V to -15V in 1V steps.[pic 28]

,[pic 29]

[pic 30]

[pic 31]

-15 to 1 Volts (1 volt steps)

-14V

2 to 15 Volts (1 volt steps)

14V

Table 7: increasing from -15V to 15V in 1V steps.[pic 32]

[pic 33]

[pic 34]

15 to 2 Volts (1 volt steps)

14V

1 to -15 Volts (1 volt steps)

-14V

Table 8: decreasing from 15V to -15V in 1V steps.[pic 35]

As the values of R2 were increasing, it could be seen that the output voltage had its drop from 14V to -14V as well as the overshoot from -14 to 14 earlier in relation to Vin values. This happens due to the direct proportionality among R2, Vin and the time of the positive part of the square wave.

,[pic 36][pic 37][pic 38]

[pic 39][pic 40]

,[pic 41]

The related frequency of oscillation was found at 1.164 KHz. The frequency of oscillation is proportional to the feedback resistance R3 (figure 3) as it could be found on the waveform sketch.

CONCLUSION

It was possible to generate a triangle wave form using a voltage comparator with hysteresis and an integrator, where it could be noticed from experimental results that changing values of the feedback resistor would imply in changes in the frequency of the circuit’s output.