Sawtooth Converter

Posted on Sep 13, 2012

Simple function generators normally provide sinusoidal, rectangular, and triangular waveforms, but seldom a sawtooth. Th

Click here to download the full size of the above Circuit.

e circuit in Fig, 21-4(a) derives a sawtooth signal from a rectangular and triangular signal. Its quality depends on the linearity of the triangular signal, the slope of the edges of the rectangular signal and the phase relationship between the rectangular and triangular signals. The conversion is carried out in IC1. Whether the triangular signal at input A is converted or not by IC1 depends on the state of Tl. This FET is controlled by the rectangular signal at input B. The signal at the output of the op amp is a sawtooth (see Fig. 21-4(b)) whose trailing edge is inverted. The frequency of this signal is double that of the input signals. If in this state, the dc level of each inverted edge is raised sufficiently to make the lower level of that edge coincide with the higher level of the preceding edge, a sawtooth signal of the same frequency (but double the peak value of the input signals) is obtained. The dc level is raised by adding input to the output of IC1 via R7 and PI. The preset should preferably be a multiturn type. Resistors R2 and R4 are 1% types. If a rectangular signal is not available, or if its peak value is too small, the auxiliary circuits (shown in Figs. 21-4(c) and 21-4(d)) will be found useful. Figure 21-4(c) amplifies the triangular input at A by 10. Differentiating network C1/R10 derives rectangular pulses from the amplified triangular signal and these are available at F. The pulses at F are shaped by the circuit in Fig. 21-4(d) to rectangular signals that have the same peak value as the supply voltage. Capacitor C2 increases the slope of the edge; it can be omitted for low-fre-quency signals. The converter provides sawtooth signals over the frequency range of 15 Hz to 15 kHz. If the auxiliary circuits are used, capacitor CI must be compatible with the frequency of the sawtooth signal (its value lies between 2 nF and 100 pF). The supply for all circuits can be between Â± 10 V and Â± 15 V. Each op amp draws a current of 4 to 6 mA.

Leave Comment

characters left:

Related Circuits

Monostable circuit

If the output is low, application of a negative-going pulse to the trigger input sets the flip-flop (Q goes low), drives the output high, and turns off 1. Capacitor C is then charged through Ra...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

PCB Exposure Box with Countdown timer (ATMEGA8)

Four blacklight lamps, 15W each, emit radiation at the region of UVA, with a peak around 350nm...

Low resistance continuity tester

This tester can be used to check IC printed circuit boards. Two 4 K resistors and the transistors...

Automobile-voltage-regulator

A monolithic 555-type timer is the heart of this simple automobile voltage regulator. When the...

220 Volt Disco Lamp circuit

This disco lamp circuit is not a voice operated switch (VOX) because this circuit is too dumb to...

remote_control circuit

At this circuit you can give a variety of utilities, from an alarm, to open a door, turn on a...

Thunderstorm Predictor

Sure, listening to VHF FM has great advantages over MW/LW AM from the old days ” now we have...

Adjustable output voltage power supply circuit MAX610

The output voltage can be calculated as follows: U. . = 1. 3 (1 + R3 / R4) (V) adjustment...

DC arc welding machine load path from one power outage

DC arc welding machine AC arc welder load loss than the loss of a large load, and therefore all...