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Old 15th September 2012, 01:55 PM   #1
emosms is offline emosms  Bulgaria
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Default lm833 single supply

Hi, strangely enough, this schematic works into the simulator.
View image: single power supply
I tried to convert a ready schematic with double supply to a single supply.
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I have the ground (-) as it is, the + power supply is connected to the +pin of the opamp,
the bias is the virtual ground (mid-voltage) connected to the opamp's (-) supply pin.
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What is wrong here? It works in the simulator...
But I don't quite see the same as examples for unipolar opamp applications.
Best Regards
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Old 15th September 2012, 02:55 PM   #2
DF96 is offline DF96  England
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It should not work in the simulator, as you have the first opamp + input set at mid voltage and the other two set at 0v. Either you need a better simulator, or that is not what you simulated.
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Old 15th September 2012, 07:29 PM   #3
emosms is offline emosms  Bulgaria
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Quote:
Originally Posted by DF96 View Post
It should not work in the simulator, as you have the first opamp + input set at mid voltage and the other two set at 0v. Either you need a better simulator, or that is not what you simulated.
It is not the mid voltage.
R1.7.1/2 resistors are not for the power supply.
Simply connecting to ground (the actual - of the supply)
The simulator is ISIS Proteus
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Old 15th September 2012, 07:45 PM   #4
DF96 is offline DF96  England
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OK. Your opamp model is too simple. The real opamp can't swing its output below the negative supply rail, yet you are using that as your signal reference.
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Old 16th September 2012, 07:37 AM   #5
emosms is offline emosms  Bulgaria
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There is smth wrong I guess.
Btw, shcematics with a mid voltage refference to the +input of the opamp seems to not work.
I am trying to convert a classic parametric eq blocks to a single suppy, but got lost.
Finally I will do it with a double supply, building dual pollar supply is going to be much easier!!
---
At least from schematic to pcb part of the electronic software works pretty well

Last edited by emosms; 16th September 2012 at 07:39 AM.
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Old 17th September 2012, 06:04 PM   #6
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By far the easiest thing to do is to make a dummy earth rail and pulling all the inputs up, you can then just connect the op amps as if they had a dual supply. Both input and output need to be a.c. coupled and the signal ground is the original ground rail.
rcw
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