I have thoroughly checked the forum and I am not 100% sure which specific part (if any) can perform what I wish. I wish the opposite of what the PN2222 transistor performs. I want the +3v from a battery to pass through when there is zero voltage at "base". So please tell me if I can perform this with the PN2222 I already have or please tell which part in particular I should acquire (small sized like the PN2222).

 

Welcome to AAC.

By "opposite" I am assuming you mean the PNP complement.

Try the 2N2907 as the PNP complement of the 2N2222/PN2222.

 

You didn't mention that the current of battery can provides and how much current that you want to output, the circuit shown below was designed for output 330mA Imax when you using 2SA684(1A) for Q1.

 

I want the +3v from a battery to pass through when there is zero voltage at "base".

Connect the base to ground via a suitable resistor (depends on what current you want out of the collector), and connect the emitter and collector as shown in post #3 (omitting R1,Q2,R2,Q3).

 

Just a note of something that caught me by surprise. The pin out of the 2N2222 is opposite of the PN2222 based on the flat.

Ken

 

Input 5.5v. Load 3v. Battery 3v. If I know how to calculate the resistor then possibly I will be able to replicate the diagram provided above (omitting R1,Q2,R2,Q3).

 

The draw current of load?
Does the 3V output also charge the 3V battery?

 

Input 5.5v. Load 3v. Battery 3v.

Sounds like you're looking for a low drop-out voltage regulator; not just using a PNP as a switch?

 

Please be specific about the exact input and output signals you have/want.

 

The draw current of load?
Does the 3V output also charge the 3V battery?

Load: 3v
No charge of battery (CR2032 used)

 

Welcome to AAC.

By "opposite" I am assuming you mean the PNP complement.

Try the 2N2907 as the PNP complement of the 2N2222/PN2222.

Never mind "try" a 2907 - its the manufacturer listed complement.

 

Considering there is no other draw current except the load when the +5.5V turn off and the battery working, so I used Reed Relay HE3621A0500 5V/10mA/500Ω, because the info is still not enough, the circuit below is what I am guessing that you need.