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Three-Level Audio Power Indicator Circuit
http://www.free-electronic-circuits.com/circuits/three-level-audio-power-indicator.html
Three-Level Audio Power Indicator Circuit. Battery-operated 3 LED display Simply connect it to loudspeaker output. Circuit diagram. Parts: R1 100K 1/4W Resistor R2 50K 1/2W Trimmer Cermet R3 330K 1/4W Resistor R4 1M2 1/4W Resistor R5 470K 1/4W Resistor R6,R7 500K 1/2W Trimmers Cermet R8 1K5 1/4W Resistor R9-R11 470R 1/4W Resistors
How to build Three-Level Audio Power Indicator - circuit ...
http://www.circuit-finder.com/categories/audio/sound-level-meter/424/three-level-audio-power-indicator
It is simple, portable, and displays three power levels that can be set to any desired value. For a standard HiFi stereo power amplifier like the 25W one described in these pages, the power output values suggested are as followings: D5 illuminates at 2W. D4 illuminates at 12.5W. D3 illuminates at 24.5W.
Remote Audio Level Indicator Circuit - ElectroSchematics.com
https://www.electroschematics.com/remote-audio-level-indicator/
The audio level indicator circuit described here removes this restriction as it may be placed close to the player’s speakers and yet the desired effect can be realised. As shown in the circuit, signals are picked up by the condenser microphone, which get further amplified by the noninverting amplifier built around one of the four op-amps of LM324. The remaining three, …
Indicator Electronic Circuits
http://www.discovercircuits.com/I/indicators1.htm
Three Level Audio Power Indicator: Battery-operated Three LED display that connect it to loudspeaker output (Circuit added 9/04) Transistor protection by transil-power and surge current duration : AN444 (Circuit / schematic design added 6/06)
Analogue LED audio level indicators explained
https://www.circuitlib.com/index.php/tutorials/product/116-how-to-design-analogue-led-audio-level-indicators
Logarithmic audio level indicator design example Suppose we want to design a logarithmic sound level indicator with 10 LEDs and a resolution step of 3db. There is a +12V power supply voltage available and we have to use some operational amplifiers of known characteristics.
Audio level meter circuit diagrams
http://circuit-diagrams.net/categories/audio-level-meter
Audio VU Meter. This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.
Three State Voltage Indicator Circuit - …
https://www.electroschematics.com/three-state-voltage-indicator/
Setting of the Three State Voltage Indicator. After assembling the circuit on a common PCB ,adjust VR1 using a variable power supply. Connect the points A and B to the variable power supply and provide 10 volts. Adjust VR1 till the LED gives Red colour. Then give 13.5 volts. At this state, LED lights Green. The circuit is ready to use.
Audio Amplifier Circuit - UC Santa Barbara
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
This is an old chip that has been a popular choice for low-power audio applications for many years. There are many other audio amp ICs on the market (LM380 and LM383 are similar but higher-power amps from National), but the LM386 is sufficient for our purposes. It comes in three-flavors, the LM386-1, LM386-2, and LM386-3, which can provide 0.3W,
Power On Indicator Schematic Circuit Diagram
https://circuit-diagramz.com/power-indicator-schematic-circuit-diagram/
To increase the sensitivity of the circuit, a cascade circuit (voltage doubler) consisting of C1, D7, D8 and C2 is used to double the voltage from D1–D6. Another benefit of this arrangement is that both halvewaves of the AC current are used. We use Schottky diodes in the cascade circuit to minimise the voltage losses.
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