Now I am using two 6V batteries in series to make a 12V DC power source. This 12V PSU further regulated to 9V, 5V, and 3V3 by 7809, 7805, and LM2837ET3.3.
I think these 3 positive voltage regulators do not using any switching circuits so should not generate any high frequency noise.
But I think there is a problem with the digital voltmeters, because they should be using oscillators in the analog to digital circuits. So I might need to switch off the meters when testing the olimex CKG modules.
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