### Author Topic: Difference between the ICs LM3915 and LM3916?  (Read 2068 times)

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#### loetmann

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##### Difference between the ICs LM3915 and LM3916?
« on: March 26, 2015, 11:02:10 pm »
Hello,

I've got a question  related to the ICs LM3915 and LM3916. These ICs are used for driving Dot/Bar Displays.
Inside are amoong others 10 resistors connected in series, which divide the reference voltage into 10 smaller voltages.
When I calculate the ratiosof these resistors in the LM3915 it is mostly about 1.41. But with the LM3916 this ratio varies from 0.6 to 1.26.

Can someone explain to me, why the ratios in the LM391 are selecte this way?

#### Alex Eisenhut

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• If you can buy it for 4\$ on eBay, why design it?
##### Re: Difference between the ICs LM3915 and LM3916?
« Reply #1 on: March 26, 2015, 11:03:54 pm »
IIRC they are selected for logarithmic response, ie for music.

#### Kjelt

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##### Re: Difference between the ICs LM3915 and LM3916?
« Reply #2 on: March 26, 2015, 11:24:18 pm »
What I remember:
LM3914 linear
LM3915 logaritmic
LM3916 floating driver for fluorescent displays.

#### dannyf

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##### Re: Difference between the ICs LM3915 and LM3916?
« Reply #3 on: March 26, 2015, 11:27:29 pm »
Quote
Difference between the ICs LM3915 and LM3916?

LM3916 - LM3915 = 1.

Very scientific.
================================
https://dannyelectronics.wordpress.com/

Smf