These circuit simulations show the 1st 5 milliseconds of initial power up. The circuit that is using V- as ground potential, appears to have a slower slew rate.

 

Because the simple simulator software executes sequentially it does not exactly show what actually happens in an actual circuit. And some simulators are not nearly as good as others.

 

The circuit that connects V- as ground potential takes longer to run.

 

The circuit that connects V- as ground potential takes longer to run.

Why does it take longer to run ?

 

it will take a bit longer because there will be on more node to solve.

 

it will take a bit longer because there will be on more node to solve.

Okay, thanks.

 

And not all simulators are always correct. You never burn out a resistor, or a transistor, with too much current in a simulator or too much voltage.

 

And not all simulators are always correct. You never burn out a resistor, or a transistor, with too much current in a simulator or too much voltage.

This is true.

 

These circuit simulations show the 1st 5 milliseconds of initial power up. The circuit that is using V- as ground potential, appears to have a slower slew rate.

These two circuits are different.
In first case Vin source is connected to ZL and to 3 resistors.
In second case Vin source is connected to ZL and to V-.

 

These two circuits are different.
In first case Vin source is connected to ZL and to 3 resistors.
In second case Vin source is connected to ZL and to V-.

Guitar Preamp 2 only used V- ground for the audio input and output, but not the gain loop. Guitar Preamp 3 uses V- ground for the audio input, output, and gain loop. The initial power up of Guitar Preamp 3 is better, but not as good as the 1/2 V+ ground preamp.

 

Guitar Preamp 2 only used V- ground for the audio input and output, but not the gain loop. Guitar Preamp 3 uses V- ground for the audio input, output, and gain loop. The initial power up of Guitar Preamp 3 is better, but not as good as the 1/2 V+ ground preamp.

I glad your question in post #1 is answered.

 

A low pass before the op amp input R1 = R2 = 10kΩ, C1 = C2 = 1nF for ~7 kHz cutoff
will allow fast pick bass to have the attack strength out of a pedal to lose the mud and put on the jet boots

 

A low pass before the op amp input R1 = R2 = 10kΩ, C1 = C2 = 1nF for ~7 kHz cutoff
will allow fast pick bass to have the attack strength out of a pedal to lose the mud and put on the jet boots

Nice to know that. Thanks

 

I don’t like Dua Lipa, but that is a kickass bass line!
To the TS: a 5 msec startup time for a capacitor coupled amp is nothing!

Me thinks that the resistor divider which you are using to generate the virtual ground, DOES REQUIRE a capacitor to V- to really be a low-Z AC virtual ground.

Or even better, use a TL082 and employ the unused device as a virtual ground buffer.