lm833 single supply

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emosms

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Joined 2010
#1
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
 
#3
DF96 said:
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.
Click to expand...
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
 
#5
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!!
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At least from schematic to pcb part of the electronic software works pretty well 🙂
 
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#6
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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