Buy a mains 12V dc plug adaptor and you can use it either has a +12V or -12V supply, connect the +V lead to your circuit 0V/common and the other lead is the -V12.
Buy a mains 12V dc plug adaptor and you can use it either has a +12V or -12V supply, connect the +V lead to your circuit 0V/common and the other lead is the -V12.
i dont know if i get you. are u saying i should connect ,what i normally use as +12V lead, to 0V/GND . because when i use multimeter i can see when i interchange leads i measure negative voltage.
i dont know if i get you. are u saying i should connect ,what i normally use as +12V lead, to 0V/GND . because when i use multimeter i can see when i interchange leads i measure negative voltage.
You Can'not use same adaptor for both + & - 12V. If You want +12v & - 12 v in single Adaptor then go for 24 volt Adaptor (transformer) and use regulator 7812 & 7912 with filter 1000mfd Capacitor.
hi t,
The input pin3 is grounded, but you have a 10K going to 15V on pin3.? also a 10uF.?
You could consider using a 7660 -Voltage generator ic, running from the +V rail to give a negative voltage.
There are more modern/better devices than the 7660, but it will give you an idea.
If an output voltage of close to 0V to say +2.5Vdc is OK, it would be possible to use a OPA that will work from a single supply.
hi t,
The input pin3 is grounded, but you have a 10K going to 15V on pin3.? also a 10uF.?
You could consider using a 7660 -Voltage generator ic, running from the +V rail to give a negative voltage.
There are more modern/better devices than the 7660, but it will give you an idea.
If an output voltage of close to 0V to say +2.5Vdc is OK, it would be possible to use a OPA that will work from a single supply.
hi t,
The input pin3 is grounded, but you have a 10K going to 15V on pin3.? also a 10uF.?
You could consider using a 7660 -Voltage generator ic, running from the +V rail to give a negative voltage.
There are more modern/better devices than the 7660, but it will give you an idea.
If an output voltage of close to 0V to say +2.5Vdc is OK, it would be possible to use a OPA that will work from a single supply.