A method is described for building a low‐voltage‐drift differential dc amplifier featuring automatic zero adjustment, a high input impedance, and a bandwidth of 10 kHz. This is achieved by an asymmetric two‐step process between the input signal and ground. Bandwidth can be extended by the use of a second amplifier during the ground‐sampling time. The amplifier can be made with standard electronic components. A major advantage of this method is that an existing amplifier can easily be converted into a low‐voltage‐drift amplifier by adding the essential elements of the described automatic zero‐adjusting amplifier to its input stage. To illustrate the method a practical example is constructed featuring a drift of 0.2 &mgr;V/ °C.