warda

yes de problem is that 74LS and 74 HC ahave greater delay which ll decrease speed. Do any one have any other schematic of digital speedometer?

GUd evening !! EM working on RAdar speedometer from the schematic of this site . the url is http://www.electronics-lab.com/projects/test/021/index.html .Unfortunately the 74 AS ics use in this project are not available in my city . i wana ask is der any replacemnt Ic of 74AS which ll work accurately? I ve discussed this matter with another person on this community n his views are "I don't think that project works. I have noticed that its photodiode is backwards. It doesn't have accurate oscillators and doesn't have any calibration for accuracy. The same author has another project using 74A ICs that also doesn't work." Audioguru Now is there any other schematic which can resolve the matter? plz help me out !! with reagrds warda