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Dual op-amps with fixed 2.5 V reference [20] LM611 Op-amp with an adjustable voltage reference [21] LM614 Quadruple op-amps with an adjustable voltage reference [22] LM675 Power op-amp with a maximal current output of 3 amperes [23] LM709 Yes General-purpose op-amp [24] LM741 LM709 General-purpose op-amp. [25] Widely used. LM747: Yes
Series regulators are the more common form; they are more efficient than shunt designs. The series regulator works by providing a path from the supply voltage to the load through a variable resistance, usually a transistor (in this role it is usually termed the series pass transistor); it is in the "top half" of the voltage divider - the bottom half being the load.
These op amps were effectively small circuit boards with packages such as edge connectors. They usually had hand-selected resistors in order to improve things such as voltage offset and drift. The P45 (1961) had a gain of 94 dB and ran on ±15 V rails. It was intended to deal with signals in the range of ±10 V. 1961: A varactor bridge op amp.
Closed-loop regulator circuits using the TL431 are always designed to operate in high transconductance mode, with I CA no less than 1 mA (point D on the current-voltage curve). [ 8 ] [ 7 ] [ 2 ] For better control loop stability, optimal I CA should be set at around 5 mA, although this may compromise overall efficiency.
An integrated circuit voltage regulator. A voltage regulator is a system designed to automatically maintain a constant voltage. It may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC ...
where Z dif is the op-amp's input impedance to differential signals, and A OL is the open-loop voltage gain of the op-amp (which varies with frequency), and B is the feedback factor (the fraction of the output signal that returns to the input). [3] [4] In the case of the ideal op-amp, with A OL infinite and Z dif infinite, the input impedance ...
The operational amplifier integrator is an electronic integration circuit. Based on the operational amplifier (op-amp), it performs the mathematical operation of integration with respect to time; that is, its output voltage is proportional to the input voltage integrated over time.
Single-chip AM radio integrated circuit from 1972. LM317: Adjustable 1.5 A positive voltage regulator (1.25 V-37 V) [8] LM13700: Two current controlled operational transconductance amplifiers (OTA), each having differential inputs and a push-pull output. LM393 No Dual Differential Comparator [9] LM358: No Low power, wide supply range dual op ...