My first schematic of a 2-channel relay board

[stealthrt]

 

Hey all this would be my first try at creating a schematic in KiCad.

The schematic is a basic 2-channel relay.

The inputs are automotive 12v and gnd. This gets converted to 5v by the K78L05-1000R3.

The Wemos D1 mini has 2 digital pin outs that are 3.3v going to the LTV-356T with a 200 kOhms resistor in between.

From there it goes to a 1k resistor and then to the PMBT3904. Between that and the G5LE-1 relay is a 1N4007F.

In that same area is another 200 kOhms resistor that’s connected to an LED.

The outputs and inputs are the 2pos and 4pos 3.5mm Pitch Terminal Block Connector 300V 8A.

Just want to make sure my values are good and the components I have selected are suitable for my application. Please let me know if I am missing anything or have a value incorrect. Thanks!

 

Question also asked on:

maker.pro, allaboutcircuits, kicad, Elec. Stackexchange, electro-tech-online.

[stealthrt]

Final schematic:
1) Removed LTV-356T Opto.
2) Added 10k between Base and Emitter of the PMBT3904.
3) Connected LED to 5v line instead of the collector line on the PMBT3904.
4) Replaced 200R with 220R.
5) Replaced normal fuses for blade fuse holders.
6) Replaced 18v G5LE-1 relay with the correct 5v relay G5LE-1A4 DC5 model.
7) Added a solder pad for the always on (AO) +12v line.

[SandraLeedom]

  

On 10/2/2023 at 2:47 AM, stealthrt said:

Final schematic:
1) Removed LTV-356T Opto.
2) Added 10k between Base and Emitter of the PMBT3904.
3) Connected LED to 5v line instead of the collector line on the PMBT3904.
4) Replaced 200R with 220R.
5) Replaced normal fuses for blade fuse holders.
6) Replaced 18v G5LE-1 relay with the correct 5v relay G5LE-1A4 DC5 model.
7) Added a solder pad for the always on (AO) +12v line.

Great to see your progress on the schematic! Your adjustments make sense, and it's evident you're putting thought into the design. Keep up the good work, and happy tinkering! I have a friend who's really swamped with college tasks and needs help with essay writing. I strongly recommend this amazing website where you can find professional essay writers for hire for college students. They're great at getting your work done on time. I've actually used this website myself, and it made a huge difference in my academic life. So, if you or your friend are feeling overwhelmed with college assignments, give this site a try. It's a reliable way to get the help you need and ensure your tasks are completed on schedule.

 

Great to see your progress on the schematic! Your adjustments make sense, and it's evident you're putting thought into the design. Keep up the good work, and happy tinkering!

[stealthrt]

Thanks!