SSR variations...

Discussion in 'The Projects Forum' started by reeveryu, Jun 10, 2009.

  1. reeveryu

    Thread Starter New Member

    Jun 8, 2009
    Hello everyone, I've just started playing with power electornics and just made a SSR just like this one

    However, being a noob myself, I've researched there are some other options for this (I've seen some using Zener diodes and some other stuff). So I have 2 main questions...

    1. What is the most efficient/easier to understand model?

    2. Are there equations or anything I should know about this (or other) model that can help me modify it? I know BF256A on the pic is used to limit the current no matter the input voltage, but I can't figure out how, and what if I want to change the values or input voltage to 3-20 volts instead of 5-25? what should I need to change and why? I'd like to test it with a 127 V 100 W incandescent lamp as the load if it's possible

    Thaks a lot people...
    Last edited: Jun 10, 2009