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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2006Very simple digital tach circuit diagram?
Anyone have a very simple digital tachometer schematic handy? I want to put a 4 digit LED tach into my van. Resolution of 50rpm is fine. Fed by the TACH output of a six cylinder GMC on distributor coil. > Anyone have a very simple digital tachometer schematic handy? > > I want to put a 4 digit LED tach into my van. Resolution of 50rpm is fine. > Fed by the TACH output of a six cylinder GMC on distributor coil. 1) This won't necessarily be a 'very simple' circuit. 2) You'll probably get better responses from sci.electronics.basics for this question. Good luck anyhow. -phaeton > Anyone have a very simple digital tachometer schematic handy? > > I want to put a 4 digit LED tach into my van. Resolution of 50rpm is fine. > Fed by the TACH output of a six cylinder GMC on distributor coil. My suggestion...just buy one...there are suppliers for gauges of just about any type. A digital tach doesnt really make much sense, IMHO, in this sort of application. An analog, or simulated analog, is much more comfortable in most cases. >> Anyone have a very simple digital tachometer schematic handy? >> [quoted text clipped - 10 lines] > application. > An analog, or simulated analog, is much more comfortable in most cases. Problem is that the display can't be larger than 1.5" >Problem is that the display can't be larger than 1.5" ...and you ned a tach on a GM van with a V6 why? >>Problem is that the display can't be larger than 1.5" > > ...and you ned a tach on a GM van with a V6 why? So I can judge engine speed in relation to when the transmission shifts and also in relation to a vibration problem I'm having. > Anyone have a very simple digital tachometer schematic handy? www.epanorama.net or www.discovercircuits.com may have something. > Anyone have a very simple digital tachometer schematic handy? > > I want to put a 4 digit LED tach into my van. Resolution of 50rpm is fine. Four digits would probably mean a display of 1000s, 100s, 10s and units. Although one of those digits could be used to display 50 rpm. > Fed by the TACH output of a six cylinder GMC on distributor coil. Here's an assembled circuit that includes a diagram online. As others have noted it isn't simple. So unless you have a desire to build one from scratch, you might want to consider a finished project. The project notes indicate that rpm's displayed below 100 be unstable. The numbers would be bouncing up and down quite a bit and would be very hard to read. Resolution to 100 would follow current practice for analog tachs. http://www.electronickits.com/kit/complete/meas/vek2625.htm You also might try a Google search. I found several home-brew kits. The one above looked most promising. |
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