Circuit Simulator - Sawtooth Wave Generator

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Sawtooth Wave Generator
Sawtooth Wave Generator
Circuit Description:
This circuit is an oscillator that generates a sawtooth wave. It's basically the same circuit as the triangle wave oscillator, except that the resistor in series with the capacitor has been replaced by two resistors, each paired with a diode going in opposite directions. For the first half of the cycle, the capacitor charges through a 40k resistor, and for the other half, it quickly discharges through a 5k resistor.

Discussion:
16 comments Page 1 of 2.

Ob1 said:   2 years ago
Lots of people seem to be having problems with this circuit. I assure you that with sensible op amps and component values it works perfectly. For those that have tried and failed are you using a split supply for your op amp (ie +/- Vcc)? If you are using a single supply then the grounded inputs to the op amp need to be connected to a mid supply voltage, easily established by two 10K resistors.

Use an op amp with rail to rail output for maximum ramp voltage. For those that have asked for how the circuit works the RH op amp is an integrator. The LH op amp is a Schmitt trigger with hysteresis from the positive feed back to reset the integrator. The circuit is readily adjusted to alter both the ramp frequency, the ramp amplitude, and the ramp average voltage. Note that as drawn the 5K resistor and the diode connected to the 40K resistor are not actually required.
(3)

Ekrem Kaya said:   3 years ago
I have tried with LM358 opamp with single power supply by adding virtual zero point. Worked well. Added another opamp and a pot to produce variable PWM signal.
(1)

Rohail said:   6 years ago
Works only with dual power supply op amps. If you have a single supply op amp you need to modify the positive input of second op amp (and maybe the negative input of first op amp as well).
(2)

Thomson said:   7 years ago
Multivibrator needs no input.
(7)

MyName said:   7 years ago
I try it. And the circuit doesn't work. My output just jump on maximum voltage level.

I tried with different voltage dividers answer still doesn't work.
(3)

Daniel said:   8 years ago
Can somebody explain what types of AO are in the circuit and what power supply it needs?
(7)

Prabha said:   8 years ago
No voltage source input why?
(6)

Saman said:   8 years ago
I do not have waveform in the output! Why?
(2)

Pete said:   9 years ago
Thanks for the diagram. I drew up the circuit in Orcad Capture and was able to run it fine. I changed the capacitor to a smaller value to increase the frequency. I am trying to design a circuit that produces a sawtooth at about 110-120 Hz to mimic the fundamental frequency of a male speaker.
I used Capture to generate a Fourier transform of the signal, and thought that the energy drops off pretty quick for what I want. I'm messing with different component values to try to decrease the dropoff.
I changed the 5k for a 2k, and the upper 40k for 80k, resulting in an even steeper slope in the fast component of the waveform. The Fourier transform resulted in an even bigger drop between the fundamental and the second harmonic, but the amplitude at higher frequencies seems to persist.
(7)

Eric said:   9 years ago
What are the applications of the saw-tooth generator?
(6)


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