sikui Posted July 15, 2006 Report Share Posted July 15, 2006 Need advices from experts or guru here...want to build a simple frequency generator that can provide 1Khz and 10Khz outputs. Need circuit diagram and components data. Better if some great expert or guru can direct me to where I can buy a project kit to build it.Thank you Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Report Share Posted July 15, 2006 The IC XR2206 By Exar is a very neat IC and can produce generate sine , square , sawtooth , pulse and triangle waves , up to 1Mhz And above . It can also Modulate FM and AM signals. you can use it's datasheet , to find the circuit diagrams . it's fairly simple to tackle with the frequency and the values. read the datasheet and you will find it. well luckily i have made a op amp version of the function generator using 741 op amp . it's maximum frequency was 0 to 1Khz i guess. i have its PCB layout and schematic , if you want it , and i have the XR2206 IC PCB layout also. The schematic for the op amp function generator is given. Quote Link to comment Share on other sites More sharing options...
sikui Posted July 15, 2006 Author Report Share Posted July 15, 2006 Dear Faizanbrohi,Really appreciated your kind help, can you email me both PCB layout and schematics. Thank you. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Report Share Posted July 15, 2006 Actually the op amp version is a little messed up around its PCB , so i will correct and send it , while the XR2206 is a better choice , so here it is . Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Report Share Posted July 15, 2006 This is the complete schematic for a function generator using 741 opamp .VALUE SHAPE # REFDES 1.00kOhm_1% RES12 1 R4 4.02kOhm_1% R0204R7_5 1 R5 4.99kOhm_1% R0204R7_5 1 R1 20K_LIN TRIPOT10X5V 2 R2,R6 24.9kOhm_1% R0204R7_5 1 R7 33nF KERKO6X5R5 1 C2 68nF KERKO6X5R5 1 C1 402Ohm_1% R0204R7_5 1 R3 Op-Amp_741 DIP8 3 U1,U2,U3 The PCB is messed up , so just follow the schematic Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Report Share Posted July 15, 2006 The three test points are the output with first being the square wave , and then the triangle and finally the sine wave. Quote Link to comment Share on other sites More sharing options...
sikui Posted July 18, 2006 Author Report Share Posted July 18, 2006 faizanbrohi,Thanks, will up date u when i have completed the project. :D Quote Link to comment Share on other sites More sharing options...
TestGuru Posted August 5, 2006 Report Share Posted August 5, 2006 Alternatively, you can use your sound card to generate those signals you need. Try this trialware at: http://www.virtins.com. It can generate single-frequency signal, mutitone, swept, arbitrary waveform, white noise, pink noise.... Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 5, 2006 Report Share Posted August 5, 2006 The function generator circuit with three opamps doesn't make a very good sine-wave.The triangle wave is smoothed with only a single RC filter so the distortion of the sine-wave will be high at about 8%.The old 741 opamp is very slow. Modern opamps are much faster and cost less. Quote Link to comment Share on other sites More sharing options...
AN920 Posted April 14, 2007 Report Share Posted April 14, 2007 This little circuit will produce sine waves with less than 1% distortion over a wide range. Between 20-20Khz distortion is less than 0.8%Needs 8-10Vp-p triangle wave input and will produce a 2Vp-p sine output. Simulation results shown at 1KHz. R5 and R3 must be set for lowest distortion. After setting it will be good for the whole range provided input amplitude remains constant.Circuit will not work well with all types of jfet's. Works well also with BF256B or jfet with similar Idss Quote Link to comment Share on other sites More sharing options...
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