Amplitude: 0.05 - 2V AC Peak to Peak at 12V DC
Distortion without adjustment: 2.5%
Distortion with adjustment: less than 1%
Output Impedance: 600 Ohm
Amplitude Stability: 0.5 dB
Amplitude: 0.05 - 4V AC Peak to Peak at 12V
Output Impedance: 600 Ohm
Amplitude: 11V AC Peak to Peak at 12V non-adjustable
Rise time: 250 ns at 1KHz
Fall time: 50 ns at 1KHz
The DIY Kit has 4 steps frequency's range: (1) 20Hz-100Hz; (2) 100Hz-1KHz; (3) 1KHz-10KHz; (4) 10KHz-100KHz. You can use jumper cup or any 1 Pole 4 Position Rotary Switch for selection of the working range. The output frequency is controlled with two Rotary Potentiometers for coarse and fine adjust.
The frequency amplitude is also controlled by Rotary Potentiometer.
Sine and Triangle wave output can be toggled with jumper on the PCB or with external 1P2T switch. The Square wave has separate output on the PCB with pull up resistor.
If you can't reach a oscilloscope to calibrate the device, please do not install Symmetry Adjust potentiometer and trim Sine Adjust potentiometer to 200 Ohm before power up the kit. Sine THD without calibration is 2.5%. Sine THD with calibration is 0.5%.
The XR2206 IC has 20 ppm/C frequency stability. In our project we use polyester film capacitors to reduce temperature drifts.
The Kit is designed for 12V regulated power supply. You can use simple LM317 or LM7812 power supply for this project.
1x Manufactured 2 Layers High Quality PCB 73x38 mm
1x XR2206CP IC
2x 1% Metal Film Resistor 5.1K
1x 1% Metal Film Resistor 10K
1x 1% Metal Film Resistor 10R
1x 1% Metal Film Resistor 3K
1x Trimmer Potentiometer top adjust 500R
1x Trimmer Potentiometer top adjust 30K
2x Rotary Potentiometer 10K
1x Rotary Potentiometer 100K
1x 1N4007 Diode
1x 100uF Electrolytic Capacitor 35V
1x 10uF Electrolytic Capacitor 35V
1x 1uF Electrolytic Capacitor 35V
1x 100nF Ceramic Capacitor 50V
1x 1nF Polyester Film Capacitor 63V
1x 10nF Polyester Film Capacitor 63V
1x 100nF Polyester Film Capacitor 63V
1x 1uF Polyester Film Capacitor 63V
1x DIP Socket 16 Pin
2x Jumper Cup
20x Pin of 2.54 mm Male Pin Header
3x Washer for Rotary Potentiometer
3x Nut for Rotary Potentiometer
XR2206 is very interesting chip manufactured by EXAR and it was designed to produce sine, triangle and square wave. The output frequency has 4 ranges and you can toggle the timing capacitor C4 - C7 with a jumper or rotary selector. R6 is the coarse control and R9 is the fine control of the frequency. R3 is the amplitude control. R10 is determines the minimum amplitude level. You can do some experiments with it value.
Actually the XR2206 IC can generate up to 1MHz, but to keep good control linearity we reduce the total frequency ranges of the kit to 20Hz - 100KHz. However you are free to experiment with R5, R6 values to increase the output frequency.
R1, R2 ratio control the frequency offset and we use in the kit two 1% tolerance resistor. But you can use external rotary potentiometer 10K instead R1 and R2 to control the offset.
R7, R8 is the sine wave calibration trimmers. If you have scope you can calibrate the purity of the sine wave to 0.5% TDH. In case you can't reach a oscilloscope, then trim R8 to 200 Ohm before power on and ignore R7 installation. Without calibration the XR2206 IC can produce sine waves with 2.5% THD.
Calibration should be made as follows:
1. Set the S/T jumper to close for the sine wave output.
2. Set frequency jumper to C5 100nF.
3. Connect 12V power supply and oscilloscope probe. Power up the device.
4. Set the amplitude to the maximum with R3.
5. Set the frequency to 1KHz with R6 and R9.
6. Use a screwdriver to trim R7 to the midpoint and adjust R8 for minimum distortion.
7. With R8 set as above, adjust R7 further reduce distortion.
R4 is a pull-up resistor to square wave open collector out. The square wave output frequency is also controlled by R6, R9. But R3 has no effect on the amplitude of the square wave.
The XR2206 has 20ppm/C temperature stability. However we supply high quality timing capacitors C4 - C7 for frequency ranges to reduce temperature drifts.
The kit is very simple to solder if you follow our PDF manual.
When you are buying this product you are agree that you have certain skills and knowledge to solder it by yourself. We are not responsible if you damage the PCB or other kit's parts due to wrong assembling or handing. In the user manual you'll find circuit and step by step instruction for soldering the kit. All components have name and number so you can easily place in on the PCB regarding the circuit and silkscreen.
No matter what, if you have any questions about assembling or using the device, we can provide you a technical support. If you are in doubt about something is always better to ask us before any action.
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