A new type of audio amp actually runs on static, turning random electronic noise into a crystal-clear signal boost.
March 25, 2026
Original Paper
Amplification based on the noise-induced negative differential resistance in a Zener diode
arXiv · 2603.23169
The Takeaway
In electronics, noise is usually the enemy that engineers work to eliminate. This experiment uses a 'noise feedback' loop to force a standard diode to behave in reverse, using random fluctuations to actually power and amplify sound.
From the abstract
A voltage biased Zener diode always exhibit positive differential resistance, thus cannot be used as an element to provide amplification of a signal. We show how to induce negative differential resistance in the reverse bias regime of a 12V Zener diode by noise feedback. We use this to build a voltage amplifier in the audio frequency range, which we characterize by providing bandwidth, gain, power consumption, gain compression and output noise spectral density.