# Need help with Citcuit Design.

#### rb8720

Joined Feb 21, 2008
3
First let me say that I am very new to this so please bear with me. I need help to design a Circuit that when power is applied it will open one switch and close another and when poser is removed it will do just the opposite.
Basicall i need a circuit to act like a SPDT switch. Thanks in advance for you help.

RB8720

#### beenthere

Joined Apr 20, 2004
15,808
Two relays with DPDT contacts can do that. What kind of power are you switching - what voltage and how many amps?

#### rb8720

Joined Feb 21, 2008
3
low power 3-5 volts. I also need components to be as small as possible. Tring to automate what is normally a manual process.

One Solution that i am considerig is using a microcontroller to controll2 transistors. For example if input pin is high then output pin a is on and B is off and if input pin is low then output pin A is off and B is on. I has hoping however that there is a simpler solution.

Thanks for the help.

RB8720

#### beenthere

Joined Apr 20, 2004
15,808