Kyle Breakiron
New Member
Ok, so I'm stumped on what I doing wrong because I cannot get this circuit to work properly for the life of me. I'm trying to construct Ron J's Four-Digit Keypad Circuit.
Found Here: **broken link removed**
I constructed the circuit on breadboard. He calls for a SPDT relay, and I am using a DPDT relay. This is where I think I might be messing up. I'm Not 100% on my connections to the relay. I'm using a LM2-12D. The data sheet can be found here.
https://www.jameco.com/Jameco/Products/ProdDS/174378.pdf
Other than that, all my components are exactly what he calls for. The make of my components are NTE. I've checked for proper biasing, proper pin configurations, I even changed out capacitors and resistors and the relay since I had two of them.
Once I finished building the circuit on his site, he shows a way to test it by connecting two LED's in series with a resistor to the relay. That can be found here:
**broken link removed**
Whats happening with the circuit I built is that one of the test LED's is lighting when I supply the recommended 12 Volts, but when I touch the common wire to "E" that LED is suppose to turn off, and the other LED's are suppose to power on due to the relay being energized.
I beg of anyone to take a look at my circuit, and see if any mistakes can be identified. I've been stuck on this for awhile now. Like I said though, I could be wiring the DPDT relay wrong because all I even need is a SPDT relay.
Here is my circuit with the one LED turning on, but it will not turn off when I touch "common" wire and "E" wire. Common wire is red, and "E" wire is green.
Here are some pictures of my circuit:
https://imgur.com/TjcnpZa
https://imgur.com/VbGmobq
https://imgur.com/7rdHHvM
https://imgur.com/7toyHIv
After taking the last picture I realized the relay doesn't even have to be connected for the LED to turn on. PLEASE HELP!
Found Here: **broken link removed**
I constructed the circuit on breadboard. He calls for a SPDT relay, and I am using a DPDT relay. This is where I think I might be messing up. I'm Not 100% on my connections to the relay. I'm using a LM2-12D. The data sheet can be found here.
https://www.jameco.com/Jameco/Products/ProdDS/174378.pdf
Other than that, all my components are exactly what he calls for. The make of my components are NTE. I've checked for proper biasing, proper pin configurations, I even changed out capacitors and resistors and the relay since I had two of them.
Once I finished building the circuit on his site, he shows a way to test it by connecting two LED's in series with a resistor to the relay. That can be found here:
**broken link removed**
Whats happening with the circuit I built is that one of the test LED's is lighting when I supply the recommended 12 Volts, but when I touch the common wire to "E" that LED is suppose to turn off, and the other LED's are suppose to power on due to the relay being energized.
I beg of anyone to take a look at my circuit, and see if any mistakes can be identified. I've been stuck on this for awhile now. Like I said though, I could be wiring the DPDT relay wrong because all I even need is a SPDT relay.
Here is my circuit with the one LED turning on, but it will not turn off when I touch "common" wire and "E" wire. Common wire is red, and "E" wire is green.
Here are some pictures of my circuit:
https://imgur.com/TjcnpZa
https://imgur.com/VbGmobq
https://imgur.com/7rdHHvM
https://imgur.com/7toyHIv
After taking the last picture I realized the relay doesn't even have to be connected for the LED to turn on. PLEASE HELP!