Sawtooth wave oscillator circuit can be implemented using several methods, here we present one design that employs 555 IC. Here is the schematic diagram of the circuit:
The core of the circuit uses general 555 oscillator configuration, but instead of using a fixed resistor to limit the current for charging the capacitor, we use a constant current source. This change the voltage ramp profile of the capacitor from logarithmic to linear. The diode is connected from pin 5 to the output (pin 3), This force the capacitor to discharge almost to it’s ground level, not only from 2/3 to 1/3 VCC as the standard configuration. The current source depends on the resistor R value, and the current will be [[zener diode voltage ] – [base-emitter voltage of the transistor] /R]. You can vary the resitor or the capacitor value to change the frequency of this sawtooth oscillator. Please note that you must keep the charging current low since it will be shorted to gorund everytime the discharging cycle take place. [Circuit's schematic diagram source: electronic-circuits-diagrams.com]
Possibly Related Articles:
- Sawtooth Wave Oscillator
Sawtooth wave oscillator is used in cathode ray tube deflection circuitry, in a PWM modulator, or in a analog to digital conversion. You can also use it in your own... - PLL Oscillator for Medium Wave Application
PLL oscillator is used to get very stable frequency woth very low distortion of sine wave output. The stability is equal to crystal-based oscillator, and the low distortion level of... - Sine Wave Oscillator Circuit Using Phase Shifter
Sine wave oscillator can be implemented using Wien-Bridge oscillator like in our previous sine wave oscillator circuit, but now we present another method of generating sine wave signal. Using phase... - Square Wave Oscillator with Minimum Components Count
This circuit generates a square-wave which is useful as a clock signal or AC drive for the excitation of sensors. this article presents a square-wave oscillator. This circuit requires no... - High Performance Sawtooth Generator
This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used...
| 
