difference amplifier การใช้

The negative feedback into the difference amplifier allows the amplifier to compare the input to the actual output.
In the top circuit, the voltage doublers, the difference amplifiers and impedances Z ( s ) account for the interaction of the transmission line with the external circuit.
The impedances Z ( s ), the voltage dependent current sources ( VDCSs ) and the difference amplifiers ( the triangle with the number " 1 " ) account for the interaction of the transmission line with the external circuit.
Block diagram of PeH醶 system with single control loop : F finger, L lamp, PC photo cell, S segments of transparent pressure cuff, C 1 average of PC-signal, DA difference amplifier, V ( PG ) plethysmographic signal, PID correcting network, C 2 set point SP, SW switch between open and closed loop, PA power amplifier, EPT electro-pneumatic transducer, M ( CP ) Pressure measured with Manometer . ( Constructed with respect to PeH醶 original drawing ).