LED VU Meter LM3915Designed by Hobby Home Electronics in Latvia
Description: The LM3915 block diagram consists of ten comparators, on the inverse inputs of which an input signal is applied through a buffer operational amplifier, and direct inputs are connected to…Read More…
The LM3915 block diagram consists of ten comparators, on the inverse inputs of which an input signal is applied through a buffer operational amplifier, and direct inputs are connected to the taps of the resistive voltage divider.
The outputs of the comparators are sink current generators, which allows you to connect LEDs without using limiting resistors. Indication can be made either by one LED (point mode), or by a line of luminous LEDs, the height of which is proportional to the level of the input signal (line mode).
The input signal will come from a microphone amplifier, assembled on a low-noise operational amplifier NE5532, at the input of the LM3915 microcircuit chip.
The circuit contains two stages with controlled gain. The gain of the first stage is continuously adjustable by a potentiometer in the range of 1 ... 10 times. The gain of the second stage can be changed in steps using a jumper. If the jumper leads are not shorted together, the gain will be greatest, which is determined by the ratio of R8 and R5 resistors. When a jumper is connected to R6 or R7 in parallel with R8, the gain will be less.
The technical features:
Operating modes: point, line.
LED incremented by one step for every 3dB.
Sound comes from microphone amplifier.
Quantity of LEDs: 20 multi-colored.
Power supply voltage: DC9V - 12V.
Contents in the package:
2 Printed circuit boards.
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