PUSH-PULL POWER AMPLIFIER Russian patent published in 2006 - IPC H03F3/20 H04R25/00 

FIELD: low-frequency power amplifiers for midget otophones.

SUBSTANCE: proposed device whose output current and gain are regulated in response to supply voltage fluctuations has two preamplifiers and input stage incorporating two output n-p-n transistor assemblies and two switches built around p-n-p transistors. One of amplifier outputs whereto lowest current is supplied from output transistor collector is connected to power bus by means of switches. Preamplifiers function to amplify antiphase variable components of input voltage and to compensate for dc components of output current.

EFFECT: reduced input current from power supply in transients, minimized current in no-signal state.

1 cl, 1 dwg