Hi there,
Here's a circuit that boosts the positive power supply for the LM358 (or other similar op amp) using one section of the LM358 so that the other section can be used as a rail to rail output op amp even with a power supply voltage of only 5 volts. It's a simple boot strapped voltage doubler, so even when powered by only +5v the output of the second section of the LM358 should be able to swing from 0v to +5v without the typical 1.5v voltage drop. Of course it should only be used for light loads.
This works theoretically, but i do have some fears for a practical circuit.
For one, the output of the oscillator section (shown in the schematic) might have to output the max current all the time it is running.
Second, although the output is fairly smooth, it isnt perfectly smooth but has a small sawtooth ripple.
If anyone wants to try the circuit out in real life that would be great.
Here's a circuit that boosts the positive power supply for the LM358 (or other similar op amp) using one section of the LM358 so that the other section can be used as a rail to rail output op amp even with a power supply voltage of only 5 volts. It's a simple boot strapped voltage doubler, so even when powered by only +5v the output of the second section of the LM358 should be able to swing from 0v to +5v without the typical 1.5v voltage drop. Of course it should only be used for light loads.
This works theoretically, but i do have some fears for a practical circuit.
For one, the output of the oscillator section (shown in the schematic) might have to output the max current all the time it is running.
Second, although the output is fairly smooth, it isnt perfectly smooth but has a small sawtooth ripple.
If anyone wants to try the circuit out in real life that would be great.