  A prototype of a very high dynamic range 32-bits Digital to Analog Converter
(DAC) was designed and built for the purpose of direct auditory stimulus
generation. It provides signals from less than 100 nV up to 50 Watts peak power
output, driving a 32-Ohms earphone or speaker. The use of ternary cells makes
possible a 170 dB dynamic range that is basically limited by thermal noise
only.
