kjones9999
Newbie level 2
Lot of smart people here-- hope you can help.
I am working on a project for my christmas lights. basically, I havea measurement computing dio48/ctr15 card and opto22 oac5 relays. As these relays are negative true logic (sink to turn on) and the card is standard, i needed someway to invert the logic. I got a 2803 and took each input from the board, ran it through the chip and out to the relay. I did this also for the common (ran it through the chip). I did not connect the bottom 2 pins (9 and 10) on any of the chips. But while i do get some response from the relay leds, it is not enough to switch a load. Do I need to power the lines coming from the dio board? If so where does the + and - go? Does the common from the card get buffered and inverted as well?
The opto22 board does have power supply input. I have tried hooking up a 5v supply with little difference. Specs say a 15ma load switches the relay.
Help-- too poor and stubborn to buy the retail stuff!
I am working on a project for my christmas lights. basically, I havea measurement computing dio48/ctr15 card and opto22 oac5 relays. As these relays are negative true logic (sink to turn on) and the card is standard, i needed someway to invert the logic. I got a 2803 and took each input from the board, ran it through the chip and out to the relay. I did this also for the common (ran it through the chip). I did not connect the bottom 2 pins (9 and 10) on any of the chips. But while i do get some response from the relay leds, it is not enough to switch a load. Do I need to power the lines coming from the dio board? If so where does the + and - go? Does the common from the card get buffered and inverted as well?
The opto22 board does have power supply input. I have tried hooking up a 5v supply with little difference. Specs say a 15ma load switches the relay.
Help-- too poor and stubborn to buy the retail stuff!