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I am receiving a signal via RF and using a HT12D to decode it and send a 5V DC pulse. I want to use this pulse to drive a latching relay. On the first pulse it will make the relay latch in NO position and the next time there is a pulse I want the relay to return to the NC position. I want the relay to retain its position even if the power is interrupted and if possible have a push button to change between states also. The relay needs to handle either 24V AC at 500mA or 12V DC at 500mA.

I have read about a 74hc73 to clock the signals but I became somewhat confused where to attach the signal input and it seemed to have more than one relay. Can someone help me out with a previous post and online link or some personal experience?

I am including a schematic that supposedly will allow a high signal to latch and unlatch a relay. I'm not sure what type of relay to use and where to input the 5v pulse for my HT12D at.

Could someone look at the schematic and tell me: 1. Will it work to latch and unlatch relay with input of 5v pulse from HT12D? 2. If so where should I connect the HT12D? 3. What type of relay should I use? 4. Will this reset if power is lost? I don't want that so how can I keep it from doing so. This is the schematic using 74hc73 to switch relay every time a pulse is entered

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  • \$\begingroup\$ Please ask a direct question that is appropriate for this site. \$\endgroup\$
    – Andy aka
    Dec 12 '19 at 8:20
  • \$\begingroup\$ So I bought the components and set this up on a breadboard and when I push the button it triggers the relay (non latching) but when I let go the switch the relay returns to normal state just like I would do by pulling high. To apply to a latching relay as soon as I attach the power to set up the relay triggers then I have to change the leads to the relay and it resets when I do that. QUESTION: Is this the right set up to use with a latching relay where I want to use push button and 5vdc pulse to switch the relay on and off. If not what can I do and if yes what am I doing wrong. \$\endgroup\$ Dec 17 '19 at 5:40

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