Function Generator Simulation (Need Help)

[xsumirx]

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

 

[audioguru2]

Please post your schematic as a normal PNG file type so we can all see it.

 

[xsumirx]

Please post your schematic as a normal PNG file type so we can all see it.

I have Uploaded audioguru

Its in JPG formatView attachment 41653

 

[audioguru2]

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.

 

[xsumirx]

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.... !!!!

 

[audioguru2]

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.

 

[audioguru2]

I found the original project here: http://sound.westhost.com/project86.htm
Your schematic is missing a wire that reduces distortion called "feedback" on the text.

 

[xsumirx]

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.......

View attachment 41654

 

[xsumirx]

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  :-*

 

[audioguru2]

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.

 

[xsumirx]

So, Can u Give me any modified latest schematic for power supply

My Requirement is

Variable Voltage Output = 0- 30 V
Variable Current output =  0-2/3A

Actually, I had decided to make the Circuit shown in below post :-

http://www.electronics-lab.com/projects/power/001/index.html

But, 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

 

[audioguru2]

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.

 

[xsumirx]

Thanks for the tip.

I have Finally Decided to make this PS. plz tell me will it work fine as per my expectation

My requirement is 0-30v o/p
with 0-3A

Plz tell me
???



PS_Parts_List_10-11-091.pdf

 

[audioguru2]

The circuit works perfectly and is very reliable.

 

[xsumirx]

The circuit works perfectly and is very reliable.

Thankyou Audioguru  ;D

This is that answer which I was want to listen in short 

 

[xsumirx]

One thing I still did not understand..... That

Current 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..  ???

 

[audioguru2]

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.

 

[xsumirx]

your answer take me to 2 different confusion...

1st
if the load resistance is 20ohm , then how 40v will flow through the load, so the maximum limit of Vout is just 30v.

2nd
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 ?

Plz...

 

[audioguru2]

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.