Isolation amplifier for electrocardiograph, etc. - has oscillator alternately applying voltage and high impedance to secondary winding of transformer

摘要

The isolation amplifier has oscillator connected to the secondary of a transformer and alternately connecting a high impedance and a voltage to the secondary. A switch is located between the primary and the output of an input amplifier and connects the primary to this output when the oscillator has connected the high impedance to the secondary. The primary is disconnected from the output when the voltage is applied to the secondary. A second switch between the secondary and input of an output amplifier connects the secondary to this input when the high impedance is connected to the secondary and disconnects it when the voltage is applied.