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| need to drive dual supply op amp with 12Vdc battery supply |
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| NASK:
Hi :) I need to drive dual supply op amp with 12Vdc battery supply. Therefor wish to follow this circuit. It makes +/- 6V with virtual ground. Q1. Is it suitable to drive opamp or other recommended methods? Q2. If I want to get +/- 8V from 12Vdc battery supply; what are the changers need to do? (I try with two op ams and changing divider resistor value to 20k and connecting two op amp virtual terminals together but didn’t work) |
| Rbastler:
--- Quote from: NASK on July 09, 2018, 05:52:14 am ---Q1. Is it suitable to drive opamp or other recommended methods? --- End quote --- In this case I would use a ICL7660A. Its important you get the A version, since the non A version works only up to 10V, but the A version works to 12V. |
| Zero999:
What's the purpose of the circuit? It might be possible to avoid a bipolar power supply. |
| David Hess:
--- Quote from: NASK on July 09, 2018, 05:52:14 am ---Q1. Is it suitable to drive opamp or other recommended methods? --- End quote --- Yes but lower the value of R1 to like 10 ohms and put 100 microfarad aluminum electrolytic capacitors between the output and each supply line to reduce the AC impedance. --- Quote ---Q2. If I want to get +/- 8V from 12Vdc battery supply; what are the changers need to do? (I try with two op ams and changing divider resistor value to 20k and connecting two op amp virtual terminals together but didn’t work) --- End quote --- Two operational amplifiers will not work for this but a ICL7660A charge pump like Rbastler suggests would. Or for a little more grunt, an LTC1144. |
| Relayer:
Hello NASK, In your pictures, you mistakenly have ground in the incorrect spot. Please refer to picture below: --- End quote --- I hope the above helps. Regards, Relayer |
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