This circuit was found in a publication by Edelman from 1924. The power comes from the battery and the listening is through a high-impedance headphone.
This circuit was found in February 1976, Radio Electronics magazine. The components are from the...
Analog Devices AD7768 24-bit sigma-delta (Σ-Δ) ADCs include an Σ-Δ modulator and digital filter...
We found this circuit in Linear Technology Applications 1993. The maximum output current is 5 A...