5 Watt Amplifier with IC AN7147 (Surround)
The 5-Watt amplifier circuit with surround system below is worth a try if you're looking to build a low-power, relatively inexpensive amplifier. This amplifier can be used in your audio equipment or simply for a test drive. Below is the amplifier circuit:
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| Schematic Image of 5Watt Amplifier with IC AN7147 (Surround) |
The AN7147, along with a few additional components, can represent a simple surround sound system that requires no opamps or negative voltage supplies. As shown in the schematic Mini Amplifier Circuit With Surround System,
A basic stereo amplifier is transformed into a surround sound system using a trick called "adding feedback from the opposite channel."
When surround sound is required, the negative feedback signal provided by C13 and C12, R3, and R4 is fed to the input of the other amplifier.
The resulting phase difference creates the surround effect. When surround sound is not required, the effect can be disabled by pressing switch S1. This causes the bistable circuit built around IC2.A and IC2.B to switch and drive transistors T1 and T2, effectively driving the negative feedback signal to ground. A high-efficiency LED and a 3.3 kΩ series resistor (R14) must be used to ensure the maximum output of the CMOS 4001 device is not exceeded. The amplifier should not be loaded with an impedance less than 3Ω.
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