LM3916 PDF

January General Description. The LM is a monolithic integrated circuit that senses. One pin changes the display from a bar. LED current drive is regulated. The whole display system can operate from a.

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All I needed I found in the datasheet of LM The LM can be feed with AC signal without any rectification, but I wanted to implement a precision full wave rectification. I chose the schematic on page 13, fig. The schematic needs bipolar power supply to work correctly, but the negative rail can be as low as -5V or even The minimum positive rail voltage depends on the voltage of the LEDs.

For example if the LED have 1. The green LEDs usually have little higher forward voltage — 2. The output mode can be set with 3-pin jumper JP1. Shorting pins will set the bar mode and shorting pins will set the dot mode. The max input voltage of the LM is set to 1. The color of the LEDs is your choice.

I used green LEDs for negative levels, yellow for 0dB and red for positive levels. For this project I bought transparent rectangular LEDs, but they have two drawbacks. First — when one column lights up the adjacent columns also significantly lights up. My solution was to paint the sides of the LEDs with black marker. There also can be used a black tape around the entire collumn.

Second drawback is that because of the transparency, the LEDs emit light from one point, which is not very pleasant. The solution here was to rasp the top side of the LEDs with rough file, so the light to diffuse more even. Comments Pingback :.

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All I needed I found in the datasheet of LM The LM can be feed with AC signal without any rectification, but I wanted to implement a precision full wave rectification. I chose the schematic on page 13, fig. The schematic needs bipolar power supply to work correctly, but the negative rail can be as low as -5V or even The minimum positive rail voltage depends on the voltage of the LEDs. For example if the LED have 1. The green LEDs usually have little higher forward voltage — 2.

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