XR2206 function generator circuit

The XR2206 function generator circuit >(Sine-Triangle-Square Waveform Generator).The frequency range is 1HZ to 1MHz. and can be adjusted by VR3.SEE circuit XR2206 Function Generator. OUTPUT Volt adjusted by VR2.To built SEE PCB XR2206 Function Generator.
-Formerly, you will find the signal generator is called “The Function Generator” for use one machine. Also would have to pay not less, called the is a very big deal. It is interested or not?

How this project works
-But now you can make it yourself easily, with a little investment. Try do like the features of this project. The heart in working of this circuit is the IC XR-2206.
Which has structure consists of four main parts of the circuit are.
1. Voltage control oscillator (VCO) that has the frequency out to, depending on the value of the capacitor between pin 5-6 and the resistor between the pin 7-8.
The output is a 2-way. The first is the sync signal. or square wave output, Section alternatively signal is supplied to the management waveform circuit.
2. The management waveform, It gives us have a sine waveform or a triangle waveform as required by changing the resistance of the legs 13-14.
3. The buffer circuit will be responsible for managing the output impedance of circuit is low values, for the extension to other circuits as well.
The real application circuit as shown below It can be seen that the switches S1 to act as Frequency Range, which can be selected third range are.
1. 1-100 Hz
2. 100-10,000 Hz
3. 10,000-1,000,000 Hz


However, by selecting the capacitance value between pin 5-6.
-Adjustment the frequency profile changing the value achieved by the VR3.
-VR2 is used to adjust gain ratio of circuit by fine with VR1 get the maximum output 1V.
– VR5 is adjusted to balance the waveform.
– Switch SW2, is a select the signal output to a sine wave or saw tooth wave form.
The signal output can be entered through the buffer circuit Q1, Q2 are out to C9.
For the square wave signal output will be out to 11 pin of IC2 , and then to the transistors buffer circuit get output to use at the emitter pin.
The square wave signal will has signal strength is about 12 volt peak to peak, So if you want to use TTL circuits using voltage 5 volt. Also must add dc converter circuit with IC-SN74LS00.

The detail of devices.
IC1___________LM7812 12V DC voltage regulator
IC2___________XR2206 Function Genertor
IC3___________LM7805 5V DC voltage regulator
IC4___________SN74LS00 Nand gate IC TTL
Q1___________ BC327 50V 800mA PNP Transistor
Q2, Q3, Q4_____ BC337 50V 800mA NPN Transistor
D1-D4_________ DB101 Diode bridge
D5____________ 1N4148 75V 150mA Diodes
R1, R2, R12______4.7K 1/4W Resistor
R3, R4, R7, R9___ 27K 1/4W Resistor
R5, R6, R16______1K 1/4W Resistor
R8, R13_________2.2K 1/4W Resistor
R10____________3.3K 1/4W Resistor
R11____________ 100K 1/4W Resistor
R14____________ 47ohm 1/4W Resistor
R15____________10K 1/4W Resistor
C1, C8__________ 1000uF 25V Electrolytic Capacitors
C2_____________ 22uF 16V Electrolytic Capacitors
C3, C7__________ 100uF 25V Electrolytic Capacitors
C4_____________ 2.2uF 25V Electrolytic Capacitors
C5_____________0.001uF 50V Polyester Capacitor
C6_____________ 10uF 25V Electrolytic Capacitors
C9_____________ 0.1uF 50V Polyester Capacitor
C10____________ 470uF 16V Electrolytic Capacitors
VR1, VR5 (Preset)__ 25K Potentiometer
VR2 Volume______ 10K Potentiometer
VR3 Volume______ 100K Potentiometer
VR4 (Preset)______ 1K Potentiometer

How to builds
All equipment except the power transformer 12volt, can be assembled onto the print, as shown below. You should solder correctly and successfully. After a successful check. Sure that the power supply to the circuit. And adjust the circuit.

– Set switch SW1 to Position 2 (100 – 10000 Hz).
-Adjust VR3 to center, then use the oscilloscope to check the signals output at the positive terminals of C9.
– The switch SW2 is in the sine wave position. Adjust VR5 to center.
– Then adjust VR4 until the best waves. Then back again to adjust VR5. To waveform do not clipping. Then try again to make sure it has the best waves.
– Adjust VR2 clockwise direction, then adjust VR1 to the signal output voltage is 1V rms.
– That square wave signal. There is no need to customize any circuit.

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  1. vishwaraj hatture February 26, 2015
  2. abdelkrim May 6, 2015
  3. Amarnath Banik December 29, 2015
  4. kalyan January 11, 2016

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