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  • March 15, 2020 at 2:59 pm in reply to: Purpose of 100 ohm resistors on 74HC595 input pins? #64676

    addmoss
    Participant

    Makes sense now. Thanks for the info.
    So far, I have found this 30VAC, 1A SSR from Panasonic as the best fit.
    (1A should be enough for 2 solenoids; my RainBird DV-100 have an in-rush current of 0.3A then stabilize to 0.23A)

    But SSR prices explode even for small voltage/current increments. Maybe it’s not yet the time for SSRs…

    My other option is using MOC3063 + the same BT1308-600 triacs. More components but way better specs and price than the SSR.

    March 14, 2020 at 4:07 am in reply to: Purpose of 100 ohm resistors on 74HC595 input pins? #64661

    addmoss
    Participant

    I’m not aware of how 74HC595 typically fails but I’m thinking that, in a worst case scenario, if 24V gets from the triac gate to that pin, the resistor is not much of a help.
    Maybe you have more experience with these circuits.

    Have you considered using SSRs on the driver side?
    AQY282SX from Panasonic looks a good pick and are quite cheap.
    Would this be feasible?

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