As shown in the figure, a simple audio amplifier circuit. An audio amplifier composed of an integrated operational amplifier is stable in operation and easy to add negative feedback, so it is easy to obtain equalization characteristics. In addition, crosstalk is small between channels, and it is easy to mix and match multiple channels. The circuit shown in Figure (a) uses dual power supplies (Vs = ±15V). The static resistance of the in-phase and inverting input terminals to ground is basically balanced. The input signal Vi is fed into the non-inverting input of the LM307N by a 0.1μF coupling capacitor. Feet 3). For the signal source, its input resistance is about 1MΩ, so its equivalent load is very light. The circuit has a voltage amplification factor of about 101 times and has good dynamic characteristics. The circuit shown in Figure (b) is powered by a single power supply. This type of power supply is desirable because there is no DC level problem with the signal in the AC amplifier. In this circuit, the audio signal K is fed through the coupling capacitor C and the resistor R1, and the inverting input of the μA741C (pin 2). It can be seen from the figure that the circuit introduces 100% negative feedback to the DC component (c is relatively open to the DC component), so there is no amplification effect on the offset voltage. The voltage amplification factor of this circuit is: Av = -R2 / R1 = -1000 (ie 60dB). However, it should be emphasized that R1, R2 and capacitor C have low frequency attenuation and phase shifting. When the signal frequency is low, the capacity of capacitor C can be appropriately increased.
LVLP series Linear Power Supplies are DC Power Supplies that achieve AC/DC conversion through power frequency transformers and transistor loop control. Compared with switching DC power supplies, linear mode power supplies have higher stability, higher accuracy, and lower output ripple. And the most important, because of the use of the power frequency AC/DC conversion principle, the linear power supply does not have high-frequency radiation interference, and is especially suitable for use in places with restrictions on EMC and EMI.
The LVLP series linear AC - DC power supplies have a wide range of output specifications, the output power ranges from 1KW to 400KW, and the output voltage can reach up to 800VDC, and accept customization.
The whole series DC linear power supply adopts industrial-grade metal chassis, pure copper AC/DC varnished transformer, high-reliability multi-transistor filter loop, ensuring the power supplies can run for a long time at full load with high stability, high accuracy, and ultra-low ripple electronic characteristics, equipped with a complete protection circuit, which can better ensure the reliability of the linear power supply itself and the safety of the customer's load.
The output voltage and current can be adjusted by the 10-turn potentiometer with scale and lock on the front, equipped with 4 1/2-digit high-resolution LED meters for output value reading, and RS communication interface can also be added for remote control and monitoring of linear power supplies.
This series of linear power supplies are mainly used for aging and testing of components such as capacitors, relays, and resistors, and can also be used for experimental testing of electronic components such as thermistors and motors. At present, many well-known capacitor manufacturers, resistor factories and other electronic component production units and scientific colleges and universities and other research and development units use this series of power supplies, and they have all been highly praised.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com