1. DonBradman

    Role of Pull up in reducing noise in a hall effect sensor.

    What decides the choice of value of pull up resistors in hall effect sensors? I have flow sensing system with a hall effect sensor. I was facing some erratic behavior when trying to take out known volume from this sensor. Sometimes it would give out the desired volume in a particular pulse...
  2. K

    When to use Pull-Up Resistors on read/write pins of Memory connected to the 8085

    Hi, I noticed that 4.7k ohm pull-up resistors are used in this circuit on the read/write memory pins: Saundby's MAG 85(scroll down to yellow text), but in other circuits where the read/write / io/m signals are decoded by the 74138 for example, pull-ups are not used? Is it because in the MAG 85...
  3. N

    Can pull-up and pull-down resistors be in the same circuit? (FPGA)

    Hello I need help with FPGA circuit design. I'm using Xilinx Artix-7 XC7A35T. Based on the datasheet/userguide, INIT_B pin must be connected to an external pull-up resistor (4.7kΩ) to ensure clean low to high transition. However, based on the circuit below, we're also connecting the circuit to...
  4. beic

    i2c Pull-up resistors for multiple chips

    Hi there, I wish to connect multiple i2c chips together on the same PCB board, these chips are DS1307, DS1621 and AT24C256. My question is, do I need to put 6 x 4.7k pull-up resistor (2 resistor / chip) or 2 x would be Ok for those three chips as shared? Also what will happen if I would...
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