Circuit description. ICL is a kind of monolithic function signal generator with excellent performance. It can generate sine wave, triangle wave, square wave. 23 Feb A simple function generator circuit with diagram and schematics using ICL, which is a pulse generator IC which generates waveforms of. DIY Function Generator (ICL) 0 Hz – Khz: Function Generators are very useful tool in electronics bench,but it can be quite expensive, but we have many.

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This is accomplished by adjusting the offset null circuitry, that is, potentiometer R 14 of the LF op-amp.

Function Generator Circuit Diagram. Figure shows a function generator that produces the sine wave, square wave, and triangle wave and has a frequency range less than 20 Hz to above kHz. Offset, amplitude, and frequency scales are pretty accurate. That alone catapaulted the from mediocrity to true A Number One function generator-hood. This IC produced not only sine wave and square wave but also triangle wave.

This is the main bulk of the magic Thomas has devised to make the play gfnerator. Turn R25 and R26 to their lowest settings. Because the output stage is configured icl80038 a noninverting amplifier, the output resistance is reduces to a negligible small value. As Thomas puts it:.

ICL8038 Function Generator

Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. Once the symmetry is good across the frequency range of the audio generator, R21 is used to trim the distortion of the sine wave to the lowest possible level. Audio oscillator circuit Simple function generator circuit Digital thermometer circuit Capacitance meter using LM Frequency to voltage converter using LM A LM is not even worth of bother. A sine wave signal is generally used in testing linear circuits such as amplifier and filters: Then this circuit will work.

However, potentiometer R 12 is used to vary the amplitude of funciton triangle wave. You’ll see it is fed the proper nutrients as well. After stabilize, the frequency can change a bit ICL chip faultbut it should not change over time.


The 8038 Audio Generator Project

Go back and forth between these to pots to arrive at a solid 20 Hz to 20 KHz range. We have more Iccl8038 Circuits that you may like to visit;Take a look below: If you’d like to etch a PCB for your audio generator, the PCB layout and parts placement document are available for download below. Nice learning about this circuit. Amplitude and DC offset adjustment Waveforms obtained in this way still need to be fed to the operational amplifier that will allow setting of the amplitude and DC offset.

Thanx for the circuit, btw. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors.

As it turns out, what the needed was a good change of diet. If this happen, you must increase the capacity of the main filter capacitors or use a more powerful transformer. A small note here, the scale of the amplitude potentiometer can only have a decorative function or you can match it to only one function. Additionally In my version of device i added the input mode for the meter, which can funciton selected on the range switch, and the output connector can be used to measure external signals.

The output waveforms can be both amplitude and frequency modulated. For example, a cold circuit set to kHz, decreases its frequency by about kHz after warming up.

In this section an audio function generator using a special designed integrated circuit, ICL, will be-presented. For example using a scope with XY inputs and sweeping the audio generator with another VCO to check out the response of a filter. Is it a piece of test equipment or a component for generaotr synthesizer?

Lets us see how the can be used as an audio function generator.

The ICL has to be operated from a dual power supply. Obviously, there are just not a whole lot of parts in this project, and all are fairly easy to get hold of. In other words, the poor thing can’t help but start out on the wrong foot when someone refers to the datasheet for guidance on how to use the thing. This is the best function generator circuit for a beginner to start with and is of course a must on the work bench of an electronics hobbyist. Sinusoidal and triangular waveforms will be passed nice, but we can forget about the square.


There are five trim pots. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery. Square output pin 9 with open collector, normally would never be able to give a good square wave at these frequencies.

The calibration is more or less an “around the horn” affair – one has to go back and forth a few times between trimpots before everything is set. On this page you will find complete plans for the function generator – a schematic, a PCB layout, and plans for a nice, spiffy case to put it in. Notice there are a number of trimpots – these are in place to ensure that the iicl8038 frequency range is met, while maintaining the correct linear waveforms of the triangle and sine outputs throughout that range.

Since the input voltage for the comparator has a greater amplitude than its supply voltage, I decided to fed it just trough the current limiting resistor. The triangle wave output is available at pin3, the amplitude of funcion is 0. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.

The circuit needs a dual power supply. Shown in the schematic LM 1.

Audio Function Generator – Electronics Project

Funtion is also simple and low in cost. Here’s a pic of Thomas’ completed project you can click on the image to enlarge it. The frequency of the output wave form can be adjusted using R7. Repeat the entire sequence a couple times to lock in all trimmers as desired.

R22 is the Low Frequency Symmetry Trim – it is used to ensure the waveforms hold their symmetry below Hz.