[shuttle]

Just came across this free software and am impressed so thought I would share: http://www.yenka.com/technology/

Download the software for your choice of computer, run the install, select Home use and enter your email address to get one year's free use.

It let's you design circuits then simulate how and/or whether they work.

Here is an example circuit I am playing with for a 'Press To Test' setup for LED Annuciator Warning Lights.

Steve

 

[Snowflake]

That's pretty darn cool. And to my surprise, they even have a Linux version. Yay!