For measurement purposes in the electronics laboratory is needed again and again signals of different frequency and waveforms. A common function generator provides sine, for example, triangular and square waves. The frequency must be adjustable and at least cover the low frequency range. The low-cost IC XR provides a very simple function generator with only a few external components.
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The frequency range is 1HZ to 1MHz. 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 Which has structure consists of four main parts of the circuit are.
Voltage control oscillator VCO that has the frequency out to, depending on the value of the capacitor between pin and the resistor between the pin The output is a 2-way.
The first is the sync signal. The management waveform, It gives us to have a sine waveform or a triangle waveform as required by changing the resistance of the legs The buffer circuit will be responsible for managing the output impedance of the 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.
However, by selecting the capacitance value between pin First, adjust the frequency profile changing the value achieved by the VR3. Next, VR2 is used to adjust the gain ratio of the circuit by fine with VR1 get the maximum output 1V. The VR5 is adjusted to balance the waveform. 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 pins 11 of IC2, and then to the transistors buffer circuit get output to use at the emitter pin.
The square wave signal will have signal strength is about 12 volts peak to peak, So if you want to use TTL circuits using voltage 5 volt. This circuit requires enough power supply. Do you have this one? If you do not have it. Look: A lot of Power supply circuit. How to builds All equipment except the power transformer 12 volts.
We can assemble them onto the PCB, 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. Second, Adjust VR3 to center, then use the oscilloscope to check the signals output at the positive terminals of C9. Then, The switch SW2 is in the sine wave position. Next, adjust VR5 to center. Next, adjust VR4 until the best waves. After next, back again to adjust VR5. To waveform do not clipping. Then try again to make sure it has the best waves.
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Function Generator with XR2206
Technical Specifications:. Premium quality XR Function Generator kit capable of producing high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Frequency output can be fine tuned using P1 and P2 potentiometers. It is a useful bench test equipment for testing and finding out unknown frequency of various devices such as oscillators, radio receivers, transmitters, function generators, crystals, etc. The meter provides very stable readings and has excellent input sensitivity thanks to onboard amplifier and TTL converter. It can even measure weak signals from crystal oscillators.