xsumirx Posted January 31, 2012 Report Share Posted January 31, 2012 Hello Friends,I want to design a function Generator which can generate the frequency in audible range ( 20Hz - 20KHz). I have downloaded the schematic from a website and Now before I proceed towards my project. I want to test it on my computer using simulation program.I am using TINA (Toolkit Interactive Network analysis) for Simulation of my schematic.But I am Getting no output at the output end.So, Guys I need your help to make my project possible.Plz help me. :( :-[I have uploaded my schematic (.TSC) please review it and give me any way to get ride over my problem. :'(Thank you In advance. :)mini_osc_using_tl062_second.zip Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 31, 2012 Report Share Posted January 31, 2012 Please post your schematic as a normal PNG file type so we can all see it. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted January 31, 2012 Author Report Share Posted January 31, 2012 Please post your schematic as a normal PNG file type so we can all see it.I have Uploaded audioguruIts in JPG format Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 31, 2012 Report Share Posted January 31, 2012 Your circuit does not work because you show power supply V3 as a positive voltage but it is supposed to be a negative voltage.Your PNG schematic is covered with the same kind of fuzz that covers a JPG file type schematic. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 1, 2012 Author Report Share Posted February 1, 2012 Thankyou Audioguru....I had done as you said....evrything is gonna fine now.........at some level Its working now...but still their is some problem,,,,....But Dont worry.....I will solve it by my own......Anyway thankyou.... !!!! Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 1, 2012 Report Share Posted February 1, 2012 The original circuit uses both opamps in each TL062 dual opamp.But your circuit uses only one opamp in each TL062 dual opamp.One TL064 quad opamp could also be used.The original circuit is powered from the 9V battery at the right side of the schematic.But your circuit has the 9V battery and the important supply bypass capacitors doing nothing because you are powering it from two 18V supplies. Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 1, 2012 Report Share Posted February 1, 2012 I found the original project here: http://sound.westhost.com/project86.htmYour schematic is missing a wire that reduces distortion called "feedback" on the text. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 2, 2012 Author Report Share Posted February 2, 2012 Thankyou...Its Really Fantastic !!!!Finally I am Going to Design it.........Thakyou AudioGuru.But Still I have an another problem with me......I am going to design a variable power supply 0-30v using LM723.I am not Getting the proper output !!!I have uploaded the Picture of my schematic !!!Plz Help me....... Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 2, 2012 Author Report Share Posted February 2, 2012 The original circuit uses both opamps in each TL062 dual opamp.But your circuit uses only one opamp in each TL062 dual opamp.One TL064 quad opamp could also be used.The original circuit is powered from the 9V battery at the right side of the schematic.But your circuit has the 9V battery and the important supply bypass capacitors doing nothing because you are powering it from two 18V supplies.Actually, The Program which I am using for simulation have TL062 in its Library with Single OP amp......Thats why I use 4 op-amp.and The mistake which I had done in right side of my schematics......that I have modified and make it correct.Anyway thanks for support :-* Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 2, 2012 Report Share Posted February 2, 2012 I am going to design a variable power supply 0-30v using LM723.I am not Getting the proper output !!!Sorry.I stopped using the very old LM723 voltage regulator driver about 30 years ago. There are many good circuits in its datasheet. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 3, 2012 Author Report Share Posted February 3, 2012 So, Can u Give me any modified latest schematic for power supplyMy Requirement is Variable Voltage Output = 0- 30 VVariable Current output = 0-2/3AActually, I had decided to make the Circuit shown in below post :-http://www.electronics-lab.com/projects/power/001/index.htmlBut, When I went to market (Lajpat Rai market, New Delhi) to purchase Component, Then I didn't found MC34072 Dual opamp.and I stoped the project,So, Can you Give me the any other schematic whose component are available in market or any Other IC equivalent to MC34071 Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 3, 2012 Report Share Posted February 3, 2012 The latest circuit for the 0V-30V, 3A power supply uses MC34071 or TLE2141 opamps that are very common and inexpensive in North America and Europe.Go to www.farnell.com and click on the flag of your country. Then order them online or go to their office to get them. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 11, 2012 Author Report Share Posted February 11, 2012 :) Thanks for the tip.I have Finally Decided to make this PS. plz tell me will it work fine as per my expectationMy requirement is 0-30v o/pwith 0-3APlz tell me ???PS_Parts_List_10-11-091.pdf Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 11, 2012 Report Share Posted February 11, 2012 The circuit works perfectly and is very reliable. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 11, 2012 Author Report Share Posted February 11, 2012 The circuit works perfectly and is very reliable.Thankyou Audioguru :) ;DThis is that answer which I was want to listen in short :D Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 11, 2012 Author Report Share Posted February 11, 2012 One thing I still did not understand..... ThatCurrent is depend on load resistance. by changing the Load Resistance only the current can be controlled.Can you tell me, How we are controlling the current here ?How we get the desired current output independently to load resistance here in the circuit ?I am completely unknown from this fact.Plz.. ??? Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 11, 2012 Report Share Posted February 11, 2012 The maximum amount of output current is adjusted with the current regulation pot.When the output current tries to exceed the setting of the current regulation pot then the output voltage is reduced until the current is what was set.Example: Set the current regulation pot for a max current of 2A. Set the output voltage to 20V.Now if the load resistance is 10 ohms, 2A will flow and the output will remain at 20V.If the load is 8 ohms then the output voltage will be reduced to 16V.if the load is 1 ohm then the output voltage will be reduced to 2V. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 12, 2012 Author Report Share Posted February 12, 2012 your answer take me to 2 different confusion...1stif the load resistance is 20ohm , then how 40v will flow through the load, so the maximum limit of Vout is just 30v.2ndif the circuit will do like this then how we will get our desired Vout at the o/p end, in this manner only one thing can be controlled by us voltage or current ?Plz... Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 12, 2012 Report Share Posted February 12, 2012 1) if the load resistance is 20ohm, then how 40v will flow through the load, so the maximum limit of Vout is just 30v.It is not a generator, it is a 30V max power supply.If the voltage is set to 30V, the max current regulation is set to 1.5A or more and it has a 20 ohm load then the current is 30V/20 ohms= 1.5A. The output voltage cannot exceed 30V. 2) if the circuit will do like this then how we will get our desired Vout at the o/p end, in this manner only one thing can be controlled by us voltage or current?You set the voltage up to 30V then you set the maximum output current up to 3A. When the output current tries to exceed the current setting then the output voltage is reduced until the current is what is the setting. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 13, 2012 Author Report Share Posted February 13, 2012 okkk...ThanxTell me one more thing !!!Will BD136 will work instead of BD140.In power supply section Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 13, 2012 Report Share Posted February 13, 2012 Will BD136 will work instead of BD140 in power supply sectionThe power supply does not use a BD136 or BD140 PNP transistor.Instead it uses a BD139 NPN transistor but a BD137 NPN transistor will work fine. Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 16, 2012 Author Report Share Posted February 16, 2012 thankyou audio guru....I have made a power supply using LM723.....I am a beginner right now...thats why I made this simple power supply and working fine for me...Some pics of my power supply Is here :[img width=680 height=510][img width=680 height=510]and finally Circuit Diagram :[img width=680 height=466]Hows Its Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 17, 2012 Report Share Posted February 17, 2012 What a mess! Quote Link to comment Share on other sites More sharing options...
xsumirx Posted February 17, 2012 Author Report Share Posted February 17, 2012 What a mess!I know it Looks dirty and even it can let anyone in confusion.........I can Understand...Ok anyway ....Its all just because it was my first time when I made a PSU indivisiually.... :-\ Quote Link to comment Share on other sites More sharing options...
Hero999 Posted February 17, 2012 Report Share Posted February 17, 2012 Why bother making your own power supply if you do it badly? You can probably get a crappy cheap Chinese power supply off ebay for much less than it cost for all of the parts and it'll be much more reliable too.You'll be lucky if it doesn't catch fire or electrocute you. Quote Link to comment Share on other sites More sharing options...
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