5
votes
2answers
733 views

Transistors: why are resistors needed?

I have a solid state relay which needs at least 3V to activate, and I need to toggle with a 2.3V output from a microcontroller. I've also got a 6V 1A power supply which I can use to power the relay. ...
0
votes
2answers
1k views

120v variable resistor controlled by 5v?

I want to do some work with automating christmas lights later this year and my friend and I think relays may be the way to go. After a little more thought, I think it would be cooler if the lights ...
2
votes
1answer
104 views

Resistor selection

I need help on what resistor (if any) I need for this set up. 12v car power as signal power to DPDT relay switch. What do I need on the deadend side of relay signal?