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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The 8038 Audio Generator Project

As always, there functiob the Thomas Henry Designs forum at electro-music. Rising edge depends only on the pull-up resistor and its growing very slowly. Go back and forth between these two pots until you get good symmetry at the low and high ends. So, you may ask, what is this audio generator for?

Thomas Functoin just doesn’t give up on an IC. Though it does use linear control voltage, it’s doubtful it would track a linear voltage produced by, say, a keyboard of a Korg MS, which produces a linear control voltage, but it would be great for sweeping and modulation effects.

In some way the quality of other waveforms is dependent on the load on this pin. It should be noted that you will probably want to use a good quality pot for R25, the Coarse functin. Repeat the entire sequence a couple times to lock in all trimmers as desired. Graphics in attachment shows the connections of switches, in this case, I used two rotating ones, 2 x 6 rows each. It is ufnction very useful bench test equipment for testing generatoe finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.

This LC Meter allows to measure incredibly small inductances making it fynction tool for making all types of RF coils and inductors. In fact, if you are going to use a scale for that pot on your panel, this will be essential. As it turned out its only making them worse, and add a characteristic spout on the top of the upper half of the sine. The ICL has to be operated from a dual power supply. We have more Measurement Circuits that you may like to visit;Take a look below: Found it and found this.


The circuit here is designed to produce waveforms from 20Hz to 20 kHz.

I got rid of some of the elements, I added my own solutions. For a while, unauthorized PCBs for the earlier version were sold, until Coach Henry spotted the rogue board and put it to an abrupt end. As Thomas puts it:. It is also simple and low in cost. The output amplitude of the square wave can be adjusted to a desired value by varying R For smaller-amplitude output ac signals, it may be necessary to reduce the output offset voltage to zero innitially.

Hi Mr Faisal is correct it important that you decouple power supply generatof positive and negative at the IC end to common with 10uF and a 0.

You may also like: Lets us see how the can be used as an audio function generator. Audio oscillator circuit Simple function generator circuit Digital thermometer circuit Capacitance meter using LM Frequency to voltage converter using LM Function Generator Circuit Diagram. ICL chip changes its oscillation frequency depending on the temperature, so when you turn on the generator, wait approximately two minutes until all the elements get heated to they operating temperature and then fine-tune the frequency.

Even though the marks on Thomas’ panel design are only approximations to help find the ballpark, a better quality coarse pot will put you closer finction those marks. The output waveforms can be both amplitude and frequency modulated. Although the functuon of the sine wave is 0. We’ll start off with the general topology that Thomas has put into place. R22 is the Low Frequency Symmetry Trim – it is used to ensure the waveforms hold their symmetry below Hz. And that certain someone was Coach Henry.

Thanx for the circuit, btw.

The audio generator operates in the the range of exactly 20 Hz to 20 kHz. For the output waveform chosen, the frequency select switch SW 1 is then used to select an appropriate frequency range; a special value of frequency is then obtained by adjusting potentiometer R 4.


This is the main bulk of the magic Thomas has devised to make the play super-nice. This signal is fed to the meter, the AVR input pin accepts such signals.

Function Generator Circuit using ICL Pulse Generator IC

That allows you to put it on your bench top and use it to test your audio circuitry. After stabilize, the funxtion can change a bit ICL chip faultbut it should not change over time. For example using a scope with XY inputs and sweeping the audio generator with another VCO to check out the response of a filter.

I found a workaround by not putting the icl8083 on the square wave output from pin 9 open collector generaotr needs to be pulled up to the power supply. This is easy to do with ears alone.

The circuit needs a dual power supply. Note that there are only two integrated circuits used in the audio generator! Since the input voltage for the icl8308 has a greater amplitude than its supply voltage, I decided to fed kcl8038 just trough the current limiting resistor. When Midwest Analog closed down, it was Distortion may be set by that most precise piece of equipment you possess the set of ears you have placed on each side of your heador an oscilloscope, or a combination of the two.

Switch SW 2 helps to select one of the three output waveforms, which is then applied to the output stage composed of the op-amp and a power booster. In the circuit of figureswitch SW 2 helps to select the desired output waveform.

Its marked as 10uF bipolar on the schematic, but its good to generatog bigger one to reduce this effect. The triangle wave output is available at pin3, the amplitude of which is 0.