17th June 2010 07:50 PM
Circuit schematic for LED tachometer?
My circuit/electronics skills are pretty limited to following schematics and building a circuit directly from them.
I'm trying to find a circuit to get me 99 percent of the way toward interfacing the following two items for indicating ml/min water flow...
15 LED Circular & Linear Bargraphs - LEDtronics - 12991
I'd like the bargraph to register 0 - 2000 ml/min. With straight up (middle) bar indicating 1000ml/min
I realize that this is essentially an LED bargraph tachometer reading pulses from a hall effect switch.
Since RPM measurement with hall switches is such a common task, I'm hoping that there exists
some schematic involving the following ICs to accomplish this with little additional conditioning
or (hopefully no) programing.
LM2917 freq/volt converter IC
LM3914/15/16/17 LED driver ICs
Would the following page be of use to me?
LM2917N, LM3914, Tachometer, PCB
Thanks so much.
Last edited by wsemajb; 17th June 2010 at 07:56 PM.
18th June 2010 02:55 PM
Am I wrong in approaching this as a tachometer?
18th June 2010 03:08 PM
Originally Posted by wsemajb
Look thru these, one is for 2917/3914
18th June 2010 03:20 PM
Maybe it is me but the Link no workie, workie?
18th June 2010 03:23 PM
Originally Posted by Reloadron
Just retried it OK,??
This is the actual thread for the 2917/3914
I Searched the Forum for 2917 tachometer
Lm2917-Lm3914 tachometer schematic
Last edited by ericgibbs; 18th June 2010 at 03:23 PM.
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