Electronics > Metrology

Marco Reps circuit LT7805 ultra low noise : what is the circuit & caps values

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julian1:
Covering the board loosely with a cardboard box to reduce air thermals, and turning on the scope 20M bandwidth filter, reduces input short noise to 220-230nV p2p. (only one ADA4523 populated).

I need to change the caps in the 100k/10r feedback dividers to bypass high-freq. from unknown mlcc to c0g or film.   

I found some Nimh eneloops, to do a bias voltage test, but they have been left in a discharged state for several years, so probably better to purchase new.

Andreas:

--- Quote from: julian1 on October 17, 2021, 02:02:31 am ---I found some Nimh eneloops, to do a bias voltage test, but they have been left in a discharged state for several years, so probably better to purchase new.

--- End quote ---
Hello,

absolutely. Old defective cells may have several 10 uVpp noise which is not related to the amplifier input capacitor.

with best regards

Andreas

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