Hello Everyone.
I have the following circuit set up, http://www.electro-tech-online.com/...ck-understanding-combination-lock-picture.jpg....
.....
however, I need to know how the NPN transistor works. Mainly, why is there a transistor there? I mean, couldnt I just connect the Solenoid directly to the output of the last flip-flop? Initially, the last flip-flop gives an output voltage of 12v. So R11 reduces this voltage suitable for the base of the transistor --- but doesnt the transistor then just increase the voltage back up to 12v.....>>Argghhhh, help, please
Thanks
I have the following circuit set up, http://www.electro-tech-online.com/...ck-understanding-combination-lock-picture.jpg....
.....
however, I need to know how the NPN transistor works. Mainly, why is there a transistor there? I mean, couldnt I just connect the Solenoid directly to the output of the last flip-flop? Initially, the last flip-flop gives an output voltage of 12v. So R11 reduces this voltage suitable for the base of the transistor --- but doesnt the transistor then just increase the voltage back up to 12v.....>>Argghhhh, help, please
Thanks