Audio power LED

General description: This is a circuit with a two-color LED indicates how much power an amplifier delivers. The circuit is connected across the speaker terminals. At low power, the LED shows green light, at higher power, the color changes to orange to red. 

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Audio Amplifier 250mW

General description: This design can be used as a small booster. The amplifier is built around a balance staircase.  The quiescent current is set by diodes D1 and D2. Due to the simplicity of the circuit is a closed-circuit current depending on

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LM 386 Amplifier circuit 1 W

 LM 386 general description: This circuit is a signal line so that you reinforce a small speaker can drive with. The LM 386 is a number of versions available. The LM 386N-1 can deliver a power of 325 mW, the LM 386N-2500 mW, the

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BC549C and BC547B Microphone amplifier

BC549C and BC547B microphone general description: The preamplifier amplifies the output signal of a microphone, so that it can be. The further amplified by a power amplifier The circuit supplies the output to a signal line. With two transistors, it is not difficult to

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ISD2560 Speech Recorder

ISD2560 circuit diagram: ISD2560 part list: R1 = 1k R2 = 470k R3 = 10k R4 = 5k1 R5 = 4k7 R6,7 = 100k R8,9 = 1M R10 = 10R C1-10 = 100nF/63V C11 = 47nF/63V E1,4 = 220uF/16V E2 = 4u7F/16V

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LA4460 Audio Amplifier 5W

This general-purpose low-power (5 W) audio amplifier is suitable for driving a speaker of approximately 8 to 12 inches. A Sanyo LA4460 IC is used as the audio output IC. The circuit consists of a loudness control, driver amplifier Ql, and bass

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