325mW small amplifier circuit based on LM386
Source: InternetPublisher:通通 Keywords: amplifier circuit lm386 Updated: 2024/03/04
This is a small 325mW LM386 based amplifier circuit with a voltage gain of 200 that can be used as a simple desktop amplifier, signal tracker or to amplify the output of a personal radio, MP3 player, MP4 player or iPod.
How this circuit works:
The gain of the LM386 can be controlled with a capacitor between pins 1 and 8. Using the 10u capacitor shown above, the voltage gain is 200. Omitting this capacitor gives the amplifier a gain of 20.
The IC operates from 4 to 12 volts DC, with 12 volts being the maximum recommendation. Power from the USB port may be able to power this desktop amplifier circuit. The amplifier has an internal input impedance of 50K, which is shunted with a 22k logarithmic potentiometer, so the input impedance in this circuit will be lower than around 15k. The input is DC-coupled, so care must be taken not to amplify any DC from the preceding circuits, or you may damage the speakers. A coupling capacitor can be placed in series with the 22k controller to prevent this from happening.
- Datasheet/Pinout/Technical Specifications of LMC555
- How do you calculate the value of capacitors in series? Why use capacitors in series?
- What is power factor and three ways to improve it
- Why use PWM? What are its advantages?
- Important things to know about PCB routing and how to design the right routing for your PCB
- What types of force sensors are there?
- Introduction of TDA4863J/4863AJ TV field scanning IC
- Simple LED advertising light circuit
- Circuit diagram of an example of differential and integral circuits
- A practical automatic electronic welcome circuit
- Common emitter-common base wideband amplifier circuit composed of F733 integrated amplifier
- Intermediate frequency amplifier circuit with neutralization circuit commonly used in radios
- Practical amplifier circuit b composed of operational amplifier LM386
- Practical amplifier circuit d composed of operational amplifier LM386
- Internal circuit principle of LM386
- Simple and applicable "karaoke" power amplifier
- Class B power amplifier circuit
- TV antenna amplifier circuit
- Pulse amplifier circuit using optocoupler
- Linear amplifier circuit with output power up to 300W