StereoLM.RU - Stereo Level Meters
Embed module of audio stereo-signal level indocator with automatic gain/scaling adjustment StereoLM-EX ver 1.0

Embed module of audio stereo-signal level indocator with automatic gain/scaling adjustment StereoLM-EX ver 1.0

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The module is designed for embedding into the equipment and to display the dynamics of changes in the amplitude of the audio frequency signal using a linear LED scale. The device allows you to evaluate the dynamism of musical audio recordings due to the built-in automatic signal level adjustment system (AGC). For this reason, the device is not designed to measure absolute voltage values.

The AGC system allows you to scale the signal evenly over the full length of the scale, regardless of the actual amplitude of the signal which allows you to use the indicator in circuits after volume/tone control devices without the need for manual adjustment of the indicator when used with various sound reproducing equipment. Even with the minimum value of the set volume, the indicator will scale a small signal amplitude to the full scale. When the indicator is disconnected from one signal source and connected to another source, automatic adjustment will occur and no additional user actions will be required.

To assess the difference in peak voltage values of both channels, an indication of maximum points is provided. With musical bursts, these points are "thrown up" by the main column of LEDs, and slowly "decrease" with sharp drops, which allows you to see short bursts.
Price List
Batch (pcs)
Price for 1 pc
≥ 105.44$
≥ 205.36$
≥ 305.10$
≥ 405.09$
≥ 504.97$
≥ 1004.76$
2 pcs  ✔  in stock
Key Features
  • Two universal inputs/outputs that allows easy connection with sound sources and sound reproduction devices (earphones and etc).
  • Two ports for LEDs tapes connection. You can use only one port (like in RX-version) or both ports if you want. Module is checking ports connection automatically and represents indication on single or both tapes at the same time.
  • Work with a large number of addressable WS2812B LEDs (64 max).
  • The ability to adjust each color, brightness, noise reduction level, reverse the direction of the indication of each channel, control the mono indication using a free application (for Windows OS only).
  • Simple external power supply needed (5VDC). You need to know the current consumption of your LEDs and select a suitable power supply. Maximum current is limited for 2 Ampers by built-in simple fuses.
  • The module contain optocoupler with open collector/emitter output that allows to turn on/off external devices or LEDs tapes after 10 seconds audio-silence was detected.
  • There is duplicate contact pads are provided on the PCB, allowing wires to be soldered instead of using connectors.
Block Diagram
StereoLM-EX - Block Diagram
Type of module
Embed version
A printed circuit board with components. The enclosure is not provided. LED tapes can be provided for a additional fee and are not included in the base package.
Lots of LEDs supported64
A single tape of 64 LEDs or two tapes of 32 LEDs each. The minimum number of LEDs is 6. The number of LEDs can be reduced within the specified limits.
Supported LED typesWS2812B
The need to use capacitors in parallel to each LEDNo
With a large length of tape (large distances between LEDs) it is recommended to install capacitors according to the manufacturer's documentation of the LEDs used.
Indication of the inert maximum point thrown up by the main columnYes
The color of the maximum point is always equal to the color of the last (upper) LED in the tape.
Connectors for external wiresTwo ports for connecting LED tapes (USB 2.0 A female). One power supply connection port (USB B micro female). Two universal audio inputs /outputs (Jack 3.5). It is also possible to solder wires to the pads.
Size (Length x Width x Height), mm40.0 x 40.0 x 15.0
Including components on the board.
The distance between the longitudinal centers of two parallel LED tapes20.0 mm
Multidirectional physical connection of LED tapes optionNo
It is possible to independently adjust the display of both levels on a single LED tape.
Supply voltagefrom 4.3 to 5.3
Incorrect power supply polarity protectionYes
Current consumption<15.0 mA
Without current consumed by the LEDs.
Additional power saving mode after 10 seconds of silencePossible
An optocoupler with an open collector/emitter is provided on the module board to control external devices (for example a relay interrupter for the supply of LED tapes or an amplifier).
Color selection for each LED16
Independent color selection for stereo channel LED tapesYes
Mono mode (indication of the level of only the left or only the right channel on a single LED tape)Yes
Automatic detection of the connection of LED tapesYes
If the LED tape is connected to only one port then the levels of both channels are automatically displayed on single tape. If both scales are connected to two ports the levels are automatically displayed separately - each on its own separated tape.
The possibility of displaying the indication of two channels on a single LED tapeYes
Disabling the indication of the inert maximum point optionYes
Adjusting the overall brightness of the LEDs option (from 0 to 100%)Yes
Reversing the indication of channels separately optionYes
Indication from top to bottom (left to right) or bottom to top (right to left).
Noise reduction level selectionfrom 0 to 30 mV
Self-configuration of module parametersNumber of LEDs, LED colors, Off/On maximum's dot indication, brightness of the LED tapes, selection of mono/stereo modes, reverse display direction, noise reduction level.
A free software application is used for Windows OS 7,8,10, which allows you to configure the parameters yourself (it is enough to configure the usual connection of the module to the computer the same as with the level indication).
Software application: Stereo Level Meter 1.0 (StereoLM.exe)
Software application: Stereo Level Meter 1.0 (StereoLM.exe)
  • A friendly, intuitive interface with help tooltips provides ease of self-configuration of the device.
  • Working only on Windows OS: 7, 8, 10 (x32, x64).
  • Just select the necessary settings and click Start-button.
  • Store various configurations in your own list, upload them at any time.
  • Play the demonstration to see how the indicator will work before actually setting up the device.
Compare table for group: Stereo signal level indicators based on LED tapes [0.35 MB]
Terms of use and warranty conditions
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