regulator question

[punchy187]

I have a regulator and the terminals are (in+) (in-) (+) (out). I am assuming both batteries need to be connected to the regulator like an external PCB board would be so I would connect the one battery positive to (in+) negative to (in-) and the other battery positive to (+) and negative to (out) without a common? If I used it on a 3.7 mode just use 2 of the 4 terminals? Things would be much easier if these parts had standard symbols instead of whatever they want to put on it. I attached the picture. Thanks.

 

[DonG]

Looks to be the lm2596 regulator. Needs two or more batteries wired in series. See this thread for more info including a nice wiring diagram:

http://www.e-cigarette-forum.com/forum/battery-mods/259577-just-lm2596-users.html

 

[DaveP]

(-) IS the common. Notice in the circuit below how the common connection for the circuit parts is where the negative terminal of the battery connects. The entire point of a regulated mod is variable voltage from low to high. You gang the batteries in series to obtain a voltage that can be varied. In the circuit below, it's 6v VCC (positive terminal reading) from 4AA in series. You could also use two 3.7v Li-ion batts to obtain 7.4 volts. The variable would be determined by the values of the circuit components.

Add Variable Voltage Control to Your eCig Mod - The PUCK e-Cig Mod

 

[BJ43]

You are thinking too much, all the current has to enter thru the in posts. This pic is the same regulator with a meter but the principal is the same. All the current goes in one end and out the other end.