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  1. D

    ULN2803A losing voltage

    Thanks Resqueline.
  2. D

    ULN2803A losing voltage

    24 volt relays work I have tried a 24 volt relay and it is switching fine. Referring to the 4.7k resistors I have used at the input, are they simply providing a form of insurance to the input to help prevent overload of the TTL signal supply. Do I need them? I have seen other schematics where...
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    ULN2803A losing voltage

    Thanks for the replies guys. I replaced the resistor SIP package with individual resistors of the same value in series with each input. I placed resistors equivalent to the relay coil value in the outputs as the relays are not available to test. I worked out the value according to the current...
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    ULN2803A losing voltage

    I am trying to use the ULN2803A relay driver for the first time. I am following the set-up as here: http://computerchristmas.com/christmas/link-how_to/HowToId-17/Control_using_a_ULN2803A I am waiting for acceptance to their forum but, hope to get an answer here faster. I have connected all...
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