Anti-logarithmic amplifier

Today, let's try to make a microphone by using a condenser microphone preamplifier circuit. Due to its high sound sensitivity, convenient use, small size and cheap price. For example, it can be directly connected to your power amplifier through the AUX channel. Then you can hear your voice clearly from the spea

The test indicators of amplifiers can be divided into two categories: linear indicator test and nonlinear indicator test. The test of linear indicators is based on the measurement of S parameters and is completed using conventional vector network analysis. For the test of nonlinear indicators, the traditional test s

If the gain or noise bandwidth of a low-noise amplifier is known or estimated , the other specifications can be measured using only a few resistors and an AC voltmeter. This example uses the Johnson equation, which describes the amount of noise generated by a resistor. To find the missing parameter, measure the amplif

If a lab uses multiple frequency counters, spectrum analyzers, and other frequency-dependent test equipment, it makes sense to provide the lab with a standard frequency. Rather than taking the time to calibrate all the instruments' oscillators or purchasing expensive high-precision oscillators, the circuit sho

　　 Power amplifier is an energy conversion circuit. Under the action of the input signal, the transistor converts the energy of the DC power supply into an output that changes with the input signal. The power is sent to the load, and the requirements for power amplification are as follows: (1) The output pow

Applications require differential measurements in the presence of high common-mode voltages, some of which are hundreds of volts or more. Making accurate measurements at these voltages is difficult and expensive. However, the AD8479 makes it easy. As described in the AD8479 data sheet, the resistor network attenuates

Transistor low-frequency amplifiers are mainly used to amplify low-frequency small signal voltages, with frequencies ranging from tens of Hz to about 100 kHz. 1. Bias circuit of transistor In order to make the amplifier obtain linear amplification, the transistor must not

TDA2030 is an audio amplifier circuit produced by Telefunken, which adopts a V-shaped 5-pin single-in-line plastic package structure. As shown in Figure 1, the pins can be divided into H-type and V-type according to the shape of the pins. This integrated circuit is widely used in car stereo recorders and medium-power