Electronics > Projects, Designs, and Technical Stuff

LM3914 led driver chip

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IconicPCB:
Is there a second source LM3914 chip or at the very least a look alike device out there in the wilds of Borneo.

thm_w:
https://www.aliexpress.com/af/LM3914.html read reviews, some are fake or non-working.

If it doesn't have to be that specific pinout I would look for an alternative IC.

T3sl4co1l:
Wonder if there's any money in programming a PIC with identical functionality.  Hmm.  I mean, it wouldn't be high voltage obviously, so would need a board with interface stuff.  Hmmmm. In a 0.3" wide DIP-18.  Hmmmm.

Big downside is sample rate, a good description of it is a continuous-time 10-bit unary flash ADC.  You'd need to run a regular SAR ADC quite fast to do that (and over three channels because of the divider and input, unless REF can be set up internally in the same way).  Though some abuse can be done because so few bits are needed (<= 4 bits, binary encoding).  Probably a SAR ADC can be clocked twice its rating and still get those bits correct?

Tim

IconicPCB:
A micro controller solution is a viable option along with multi op amp comparator "flash converter".

While they are an option it is a shame that so much analog functionality has been lost along the way.

Richard Crowley:
LM3914 is listed as "active" on the TI website.
But the LM3915 and LM3916 have left the building.

I started a similar thread at:
https://www.eevblog.com/forum/microcontrollers/replacement-for-lm3915/msg1087514/#msg1087514

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