However, due to the limitation of A2 differential input voltage and the constant of transistor driving circuit, it is not allowed to change the supply voltage greatly. In principle, the oscillation period should not be affected by the supply voltage. The charging current of Cx is determined by the supply voltage and R2, and the discharge current is determined by the supply voltage and R1 + R2. Its amplitude is determined by R4 and R3, equal to 1 / 3 of the supply voltage. A Schmidt circuit consists of A2 and the Schmidt circuit forms positive feedback and generates oscillation. A Miller integrating circuit consists of A1. And the capacitance can be measured by the oscillation period of the triangular wave. CatalogĪs Figure 1 shows, the measuring principle of this circuit is: a triangular wave is formed from the process of charging and discharging of measured capacitor Cx. This article will introduce the circuit of capacitance measurement composed of LM741. The high gain and wide range of operating voltage provide superior performance in integrator, summing amplifier, and general feedback applications. It is intended for a wide range of analogue applications. Technical Data on LM Branded types is identical to the corresponding CA Branded types.The LM741 series are general-purpose operational amplifiers. The manufacturing process make it possible to produce IC operational amplifiers with low burst "popcorn'' noise characteristics. Each type consists of a differential input amplifier that effectively drives a gain and level shifting stage having a complementary emitter follower output. Types CA1458, CA1558 have no specific terminals for offset nulling. A 10kΩ potentiometer is used for offset nulling types CA741C, CA741 (see Figure 1). These types also feature wide common mode and differential mode signal ranges and have low offset voltage nulling capability when used with an appropriately valued potentiometer. These monolithic silicon integrated circuit devices provide output short circuit protection and latch-free operation.
The LM741CN, CA1458, CA1558 (dual types) CA741C, CA741 (single types) high-gain operational amplifiers for use in military, industrial, and commercial applications. Function : 0.9MHz Single and Dual, High Gain Operational Amplifier
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