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Ricardo 4, 12 37 Your cart has been saved and will be available when you login next time. The output still remained on a HIGH state, around 4. Your account information matches our records. Please enter Email Address. This is why the outputs of the encoder are always high — if the switches are off, the floating inputs act as high inputs, and when a switch is on it is also driving the input high.
How would you like to proceed? Sorry, your details do not match our records. Since the the inputs to the 74LS are active low, you actually want the common lead of all the switches to go to ground, instead of VCC.
The warranty period is 90 days for new, refurbished and repaired parts, and 30 days for used parts, starting on the delivery date of the part. I then tried connecting some inputs, along with their resistors, to the Ground. In any case, in your example 47ls148 inputs A, B and C should come from switches.
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Wildan Maulana Syahidillah 3 1 4. With your DIP switch connected as described you will need to provide 7l4s148 way for the inputs of the decoder chip to go low when the switch is off. This way it will work for both types of chips.
Motorola – datasheet pdf
Sign up using Facebook. Do you want to continue? Thank you for initiating the registration process. Re-enter your account number, zipcode to try again. The Pro Rata warranty allowance is calculated as:. So you can just move your common lead from VCC to ground and try it. Please enter Email Address Next. Please Enter Valid Text. Post as a guest Name.
74LS148 – 74LS148 8-to-3 Priority Encoder
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