Current Amplifier Circuit Using Op Amp. The advantage of the twin t topology is that it is easier to tune than the sallen key. For example if your load current is 2500 ma and you are using a transistor with h fe 100 you will need about 25 ma of base current.
The voltage between them is given by vout vin r2r1 r2 where vin is from the power supply. Current boosted follower circuits most op amps can provide maximum output currents of only a few milliamps and this is the current driving limit of the voltage follower circuits in figures 7 to 9. From here the op amp has negative feed back ie the output is connected back to the input and balances the v and v terminals to approximately the same potential.
Two transistors are used in this circuit.
Terms used for differential amplifier formulas. A current amplifier can be realized using transistors the schematic of a current amplifier circuit using transistors is shown in the figure below. Keep in mind that the op amp s output voltage is about 0 7 0 9 v higher than the load voltage. Operational amplifiers op amp are linear devices that have all the properties required for nearly ideal dc amplification and are therefore used extensively in signal conditioning or filtering or to perform mathematical operations such as adding subtracting integration and differentiation.
