An amplifier circuit with gain music output power up to 7W

This is an amplifier circuit that gains music output power up to 7W. It uses IC TDA2003 as the main component. This 7 Watt Audio Amplifier circuit is a small but powerful multipurpose amplifier. IC TDA2003 provides high output current capability (up to 3.5A) very low harmonics and crossover distortion. Completely safe operation is guaranteed […]

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Circuit diagram of 80W power audio amplifier based on Power IC lm12

This is the circuit diagram of 80W power audio amplifier based on Power IC lm12. The circuit kit is sold in the electronic parts / components store, and the design has proved to be effective and operational. The amplifier operates with a bipolar power supply. Here is the amplifier circuit diagram: Here is the PCB […]

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Sample and hold amplifier circuit without external resistance

The sample and hold amplifier circuit structure without external resistance in the figure does not use external resistance. In the steady state, during the internal tracking cycle, the internal logic signal is high-level effective, enabling the follower composed of A1, B1 and A2. Therefore, the capacitor C2 with the ground as the reference is charged […]

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Circuit diagram of 45W class B amplifier

Circuit diagram:   spare parts: R1______________ 18K 1 / 4W resistor R2_______________ 3k9 1 / 4W resistor R3,R6____________ 1K 1 / 4W resistance R4_______________ 2k2 1 / 4W resistance   R5______________fifteenK 1 / 4W resistance   R7______________twenty-twoK 1 / 4W resistance R8_____________ 330r 1 / 4W resistor   R9,Rten__________ 10R 1 / 4W resistor   Releven,Rtwelve_________ 47r 1 / 4W […]

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What is the function of Agca

Automatic gain control (AGC) is short for AGC. An automatic control method in which the gain of the amplifier circuit is automatically adjusted with the signal strength. The circuit to realize this function is called AGC loop. AGC loop is a closed-loop electronic circuit and a negative feedback system. It can be divided into two […]

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A complete set of negative feedback amplifier circuit diagrams

Four basic types of negative feedback amplifier 1. Voltage feedback and current feedback If the feedback signal is taken from the output voltage signal, it is called voltage feedback; if the feedback signal is taken from the output current signal, it is called current feedback. Usually, the method of short circuit the load resistance is […]

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What is the function of emitter follower

Let’s first look at the schematic diagram of the emitter follower. At first glance, this diagram is almost the same as the common emitter amplifier circuit, except that the output capacitor C2 is moved from the collector of the triode to the emission stage. Indeed, the emitter follower is like this. However, in practical application, […]

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What is the reason of series capacitor in triode amplifier circuit?

The capacitance of input and output of triode amplifier circuit are input coupling capacitance and output coupling capacitance respectively. Their function is to prevent the interaction between signal source and load and the DC bias circuit of triode. Next, we take a specific transistor amplifier circuit as an example to introduce in detail the meaning […]

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