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I have recently gotten a LNA Ebay. It needs 12V 75mA.

Since I want to measure 1kHz to 2MHz I am afraid of noise from a cheap Li-Ion 12V battery/powerbank which maybe has some noisy DC-DC converters. 9V block has insufficient voltage which maybe changes too much when being not full.

So I want to know which battery you recommend principally?

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    \$\begingroup\$ Measure what? If for example you want to measure the LNA's gain then noise shouldn't be an issue. If you mean that the supply ripple disturbs the measurement, then simply filter the supply. How low does the noise and ripple on the supply need to be for a proper measurement? Why not simply use a proper lab supply? Anyway: product recommendations are off topic here so no one is going to recommend a battery. \$\endgroup\$ Commented May 4, 2020 at 19:19
  • \$\begingroup\$ I want to measure Electrical fields with an handheld oscilloscope and its probe. I always thought mitigating noise is better than filtering it. I want to build the LNA in a box, so its power supply should be a battery. \$\endgroup\$ Commented May 4, 2020 at 19:30
  • \$\begingroup\$ You are concerned about the amount of noise from a battery?!? \$\endgroup\$
    – Aaron
    Commented May 4, 2020 at 19:38
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    \$\begingroup\$ I want to measure Electrical fields with an handheld oscilloscope and its probe My 2 cents: That's not going to work with this LNA because it has a 50 ohm input impedance which will load a (passive) probe so much that you will have virtually no signal left. You will get more signal if you just connect the probe directly to the scope. What you need is a FET probe type of probe-circuit. A proper FET probe circuit will also consume way less than 75 mA. \$\endgroup\$ Commented May 4, 2020 at 20:16
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    \$\begingroup\$ You might be able to use this LNA with a magnetic probe though, learn here how to build one yourself: youtube.com/watch?v=2xy3Hm1_ZqI However for the low frequencies you're interested in a magnetic probe might prove useless. That video is from Dave's EEVBLog on Youtube. There are plenty of videos there that you can learn from so that you get a feel for what works and what does not so have a look at other videos as well. \$\endgroup\$ Commented May 4, 2020 at 20:22

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