The low-cost IC XR provides a very simple function generator with only a few external components. XR data sheet provides complete basic circuit for a. Function Generator is an essential laboratory equipment. The module described here is based on high quality XR IC. 1Hz – 2MHz XR Function. IC, XR,Function Generator. Other products by Major Brand IC’s reviews Description. Item# XR Function Generator.

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There are integrated circuits that produce sine waves, although they are really relaxation oscillators and the sine waves come from shaping a triangle wave. The XR lc some interesting features that illustrate some of the topics mentioned in this page, so let’s examine this chip.

The XR provides a square wave at an open-collector output, as well as a sine wave.

It can produce a triangle wave, but this is really just a step towards the sine wave, and is seldom required. The frequency is set by a capacitor, in the range 0. There are actually two timing resistors, and which one is used is selected by the level on pin 9.

When pin 9 is open or above 2 V, the resistor called R1 is used. When pin 9 is below 0. This gives easy frequency-shift keying FSK by a logic input to pin 9. A circuit for testing the XR is shown at the right. The 50k pot adjustment is also important. This circuit sets the average value of the output waveform here to 6. If the amplitude is not set correctly, the waveform will have flat tops or bottoms, or both.

The proper adjustment of these controls is necessary for a good-looking sine wave. The XR makes a quite passable sine wave. I found 10k and 0. Pins 7 and 8 are held at 3 V, and more oc 3 mA should not be drawn from them, so 1k is the minimum timing resistor. The chip is advertised to work down to 0.


Reducing R to 2k gave an ideal 20 ms period, or 50 Hz. The output was centered on 6. The XR has an AM input at pin 1. I used modulation at 1. The DC bias at this input is necessary, and the signal amplitude must be properly adjusted.

The kHz signal could be picked up on an AM radio at the expected frequency, and the modulation heard. I simply put the end of the whip antenna of the small pocket radio near the output of the XR, and got plenty of signal.

One could make a small AM radio transmitter with this chip for use over short distances. The output frequency can be modulated by an external voltage using the circuit shown at the right.

R is the normal timing resisor, while RC handles the modulating current. The formula for the frequency is shown in the figure. If the applied voltage V is 3.

An increase in V lowers the frequency, and an increase raises it. In any case, do not exceed 3 mA from pin 7 or 8. Use iic buffered potentiometer to test the dependence of frequency on VC. Supply VC from a function generator, setting the DC bias at 3.

Uc waveform looks like a spring extending and contracting! Modulating the frequency with an external signal has quite a few applications. One is displaying frequency response on the scope–you might try this with a parallel resonant circuit.

1Hz to 2MHz Function Generator Kit with XR

Feed Y and the XR with a triangle wave, and X by the rectified voltage oc the tuned circuit. FM would also be good for testing a phase-locked loop. The XR offers many possibilities for sine wave generation and modulation over x2206 wide range of frequency. The output can be buffered to adjust its DC component and signal amplitude. Frequency can be varied by a range switch and a potentiometer, so that one could make a fairly useful function generator based on this chip, at low cost.


Rx2206 LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.

Function Generator with XR2206

The output waveforms can be both amplitude and frequency modulated. The meter is a perfect addition to any power i, battery chargers and other electronic projects where voltage and current must be monitored.

It is a very useful bench test equipment for testing and finding out the frequency of dr2206 devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.

It also analyzes transistor’s characteristics such as voltage and gain. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. 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. It’s small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors.

Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, xr206 systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of.