An ultra low noise voltage preamplifier is presented that, while characterized by excellent noise performances, is based on a very simple topology. Indeed, the choice has been made of maintaining the component count to a minimum and of avoiding, by design, that any trimming or calibration step be required. This was done in order to make the realization of this piece of instrumentation as simple as possible for any researcher interested in noise measurements. The amplifier is AC coupled with a low corner frequency below 100 mHz and a useful bandwidth in the order of a few kHz. The voltage gain is 80 dB and the equivalent input voltage noise is 14, 1.4 and less than 1 nV/Hz at 100 mHz, 1 Hz and for f>10 Hz, respectively.

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