Black AMP40 Audio Power Amplifier HiFi Mini Bluetooth High Power 400W 220V Audio Power Amplifier

Black AMP40 Audio Power Amplifier HiFi Mini Bluetooth High Power 400W 220V Audio Power Amplifier

Description:
- Current mode circuit is a circuit that can effectively transmit, amplify and process current signals. In the current-mode circuit, the voltage-mode circuit corresponding to the current-mode circuit that takes the current as the variable to analyze and calibrate the circuit is the circuit that focuses on the transmission, amplification and processing of voltage signals, and the theory and technology that uses the voltage as the variable to analyze and calibrate the current mode of the circuit has developed rapidly in recent years. Its main characteristics are high-speed transmission and very small distortion. For a long time, people have been accustomed to the processing of voltage signals, while ignoring the processing of current signals. In practice, many devices have the function of current transmission. For example, the transmission signal of BJT and FET is a current quantity. Therefore, when processing signals, it is not necessary to convert them into voltage. For these devices, the current mode processing method is more simple and convenient. The main difference between current-mode and voltage-mode circuits lies in the input and output impedance. First, an ideal voltage amplifier requires infinite input impedance and zero output impedance. This requirement is conducive to voltage signal transmission. For an ideal current amplifier, the input impedance is zero and the output impedance is infinite. Only in this way can the current signal be transmitted.

Features:
- The Translinear principle is used to simplify the circuit operation. The translinear principle is described as follow: In a circuit, once a translinear loop occurs, there is a constraint relationship between the current of each transistor in the loop. Using this constraint relationship, the calculation of complex circuits can be simplified, and this principle will be applicable to linear and nonlinear circuits, that is, small signal and large signal.
- Large dynamic range: the minimum value of input signal is limited by noise. For voltage and current, the maximum value of output signal is limited by the power supply voltage for voltage-mode circuit or the capacity of tube or power supply for current-mode circuit. In this respect, current-mode circuits are not dominant. However, when low power supply voltage is required, the maximum output current of the current circuit can only be limited by the tube. As long as the tube can give large current, its dynamic range can be very wide, which shows great advantages.
- Characteristics of current mode circuit: wide frequency band and high speed. In the current-mode circuit, the interpole capacitance (junction capacitance Cbe cbo) of the tube can be placed on the low impedance node because the voltage swing is not considered. Make its upper limit frequency very high, almost close to Ft. A common base circuit is an obvious example. Its input impedance is very low and its output impedance is very high, which is very close to the current amplifier (a=1). The upper limit frequency of its short-circuit current amplification coefficient is fa. The reason is very obvious. When the output terminal (C pole) is short-circuited, the two junction capacitances Cbe and Cbc are located at the low impedance node. The corresponding time constant is very small, and its upper limit frequency is very high. Because the junction capacitor is on the low impedance node, even if the injected current changes in a large range, the voltage at both ends of the junction capacitor changes very little. Therefore, it takes a short time for the junction capacitor to transition from one level to another, thus improving the transient response speed.

Specification:
- Distortion (THD): 0.015%, 1KHz, 10W
- Output power: 2 x 200W/4ohm, 2 x 150W/8ohm at 1KHz, 10%
- Frequency response: 5Hz-220KHz  -3db
- Conversion rate: 350V/us
- Size: 197 x 197 x 160mm
- Weight: 7.8kg

Package Included:
- 1 x AMP40 Audio Power Amplifier