Nemesis is a single-ended Class AB analog amplifier built around a dual-rail supply architecture. The design target is straightforward: combine wide bandwidth, low distortion, high output-current capability, and very low output impedance in a compact amplifier board intended for demanding loudspeaker use.

The amplifier operates from rails between ±5 V and ±50 V, with ±30 V recommended. It is specified for 100 W program power and 200 W maximum power, with a minimum recommended supply current of 5 A. Its minimum load impedance is 0.5 Ohm, and nominal output current is listed as 15 A at ±10 V, 7 A at ±30 V, and 4 A at ±50 V.

The measured distortion figures are central to the design. THD+N is specified at 0.005% at 1 kHz, 100 W into 8 Ohms, while IMD THD is 0.007% under the same conditions. Output gain is +27 dB, and efficiency is specified between 50% and 94% depending on operating conditions.

Dynamic behavior is also strongly specified. Slew rate is 60 V/us, damping factor is 4000 at 60 Hz into 8 Ohms, and output impedance is 0.002 Ohms. Input impedance is 10 kOhm. Together, these figures describe an amplifier designed for strong load control and low interaction between amplifier output and loudspeaker impedance variation.

Bandwidth extends from DC to 1 MHz (-3 dB), with audio-band linearity of ±0.01 dB. Small-signal performance is specified with 98 dB non A-weighted SNR, 108 dB A-weighted SNR, 116 dB CMRR, 115 dB PSRR, and 95 dB open-loop gain. These values place the original Nemesis in the same measured-performance class that later defined the V2 revision.

The original board measures 84 mm x 90 mm. In practical use, Nemesis is aimed at systems where power output, load tolerance, and predictable analog behavior are more important than added supply integration on the amplifier board itself.

Read instead about Nemesis [V2]