Audio sine-wave generator

Posted on Nov 19, 2012

U1A, an op amp, oscillates at the frequency at which the phase shift in the Wien bridge network is exactly zero degrees. Changing bridge component values changes the oscillator frequency. In this circuit, we need change only the two resistors to do this. S1A chooses a value among Rl through R6, and SIB similarly selects a value from R7 through R12. U1A must provide enough gain to overcome losses in the bridge, but.not so much gain that oscillation builds up to the point of overload and distortion. U2 and Cl automatically regulate circuit gain to maintain oscillation. U2 places Dl across R13 with the proper polarity on both positive and negative alterations of the signal at pin 1 of Ul.

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

As the voltage at pin 1 of Ul approaches its peak value, Dl enters its Zener breakdown region, effectively shunting R13 with a resistive load. This increases the amount of negative feedback around Ul, reducing its gain. R15, WAVEFORM ADJ, allows you to optimize circuit operation for lowest distortion. U1B provides isolation between oscillator and load. With the values shown for R17 and R18, U1B operates at unity gain.

Leave Comment

characters left:

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

High Speed NiCd Charger for R/C

It can safely charge a 7-cell RC2000 pack in about 14 minutes, and an RC2400 or CP2400SCR pack in...

10 or more switches using a microcontroller

There are several ways to read multiple switch inputs using a reduced number of...

Voltage follower with 1G ohm input resistances

This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using...

300m FM transmitter circuit design project

This fm transmitter circuit is very simple and it has a acceptable transmission. The signal...

Model 1681 Instruction Manual

This manual is applicable to all integral horsepower DC motor controls of this series from 40...

MUTS Multi-Target Development System

The following describes the design, construction, operation and use of the Multiple Target...

35W switching power supply circuit having a set-top box output of 5

35W switching power supply circuit having a set-top box output is shown in Figure 5. The five-way...

200 meters remote control schematic design

Early transmitters use more LC oscillator frequency drift is more serious. SAW devices appear to...