ParkingLotLust
Member
Hey guys,
When Im in the lab working, I often find a tracking, +/- power supply is very useful when experimenting with opamps. I have a beastly bench supply that I use, which works with no problems. However, I am investigating something a lot easier.
My goal is this: to implement a step-up converter, from 5v to 32v, so I can split the 32v in half, to get my op-amp supply. This way, I can use the fixed 5v supply that I use in nearly every circuit ANYWAY, to drive my opamps. The output voltage will also be adjustable.
Ive already tested a step-up circuit using the MC34063 which works flawlessly - I have no problems up to this part. Ive also included a resistor + pot for R2, so I can adjust this voltage down to about 3v.
However, my issues come in when I try and split the 32v to +/-16v. This requires me to create a virtual ground, which I dont want to do. Id much prefer using circuit ground, to make life a lot easier. With my current approach, I dont see this as being possible.
What would you guys recommend to overcome my problem? Any ideas Ive had thus far are not permanent, Im just trying to show my thought process.
When Im in the lab working, I often find a tracking, +/- power supply is very useful when experimenting with opamps. I have a beastly bench supply that I use, which works with no problems. However, I am investigating something a lot easier.
My goal is this: to implement a step-up converter, from 5v to 32v, so I can split the 32v in half, to get my op-amp supply. This way, I can use the fixed 5v supply that I use in nearly every circuit ANYWAY, to drive my opamps. The output voltage will also be adjustable.
Ive already tested a step-up circuit using the MC34063 which works flawlessly - I have no problems up to this part. Ive also included a resistor + pot for R2, so I can adjust this voltage down to about 3v.
However, my issues come in when I try and split the 32v to +/-16v. This requires me to create a virtual ground, which I dont want to do. Id much prefer using circuit ground, to make life a lot easier. With my current approach, I dont see this as being possible.
What would you guys recommend to overcome my problem? Any ideas Ive had thus far are not permanent, Im just trying to show my thought process.
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