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74LS circuit output remains constant regardless to input – Stack Overflow
Join Stack Overflow to learn, share knowledge, and build your career. Please enter Email Address. Please enter Email Address Next. Post as a guest Name. Sign up or log in Sign up using Google. I repeated the entire process with another 74lx148 IC to make sure the first one was working.
Re-enter your account number, zipcode to try again. I then tried using pull up resistors, the use and circuit configuration of which is not entirely clear to me, which I think is the problem. Since the the inputs to the 74LS are active low, you actually want the common lead of all the switches 47ls148 go to ground, instead of VCC.
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This will help regulator function as desired. Galux Trabakoulas 14 3. Cover Tubing Access Light Gray. Second, make sure your switches are all off to begin with, and then turn only one on at a time if you do turn on more than one, there is a table in the 74LS datasheet which will indicate what the output should be.
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Please enter appropriate 74ls1148 ID. Customers also shopped for. About Us Contact Us. Besides tying the common lead of the switches to ground, I would also connect 4.
74LS 8-to-3 Priority Encoder
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EI pin-5 must low connect to ground. This form will auto-populate account information for registered users.
To be honest, I didn’t really know how to use the dip switches, but 74ks148 get it now, thanks. With your DIP switch connected as described you will need to provide a way 74ld148 the inputs of the decoder chip to go low when the switch is off. Do you want to continue? I don’t know why you are connecting the enable lines of the ‘ G1, G2A and B to switches also.
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