VVBox and VVpassthru

[Youssefa]

You isolate the inputs using a (on off on) switch spdt. The centerpost to your Vin regulator and the outer posts, one to battery (+) and one to 12v source (+). In my large box I used a the large round toggle switch (on off on).

This is my first, so I am having difficulty visualizing the circuit paths. with 3 input sources I will basically have 2 external and on internat so the PT an d ext batt are wired to the same batt position. As they would not be in use at the same time. ON(ext batt/PT), OFF is OFF, ON(int batt)? and they all share common ground?

 

[Youssefa]

got all but one switch and battery holder ordered. It will be a good new years project!

 

[TomCatt]

That sounds right Youssefa.

Don't forget to post some pictures


Sent from my iPod touch using Tapatalk

 

[BJ43]

Here's another voltage/watt meter. Looks like it may be very similar to the 'Watts Up' linked to above. I wonder if you removed the housing on one of these, how much room the actual circuitry takes up.

Tenergy 100A 3 in 1 Self-Balance, Voltage and Watt Meter | Battery Superstore

The 7 in. package length turned me off on this.

 

[BJ43]

This is my first, so I am having difficulty visualizing the circuit paths. with 3 input sources I will basically have 2 external and on internat so the PT an d ext batt are wired to the same batt position. As they would not be in use at the same time. ON(ext batt/PT), OFF is OFF, ON(int batt)? and they all share common ground?

Your assumptions are correct. The three way switch is also your master switch in the off position. Go for it, nothing beats a self made PV.... TomCatt and I are here to help if you need it..

 

[Barryg41]

How about this little meter! It measures resistance and capacity. Looks like it could be pretty small after disassembling it.
I guess this what your looking for. There was two other models close to this design.


http://www.amazon.com/Extech-RC100-Passive-Component-Tweezer/dp/B0013XWGXC/ref=pd_sim_sbs_e_4

 

[TomCatt]

Dang , would be nice, they have a multimeter one; but a little large. Might be doable

 

[BJ43]

Greenlee PDMM-20

I like this one, it is completely automatic scaling and auto sensing.

http://www.greenlee.com/archive/ma-4604.pdf

 

[BJ43]

Craftsman
This one is also interesting

 

[BJ43]

Maybe installing one of these so it is the back side of the box mod..

 

[BJ43]

Amazon.com: Greenlee PDMM-20 Pocket Multimeter: Home Improvement

The temptation was too big, went ahead and ordered this.

 

[Cool_Breeze]

Craftsman
This one is also interesting

I have one of these under a different brand name. It is very handy and works nice. The display takes a little time to update. That hasn't been a problem for me.

 

[BJ43]

This is an old one from RS, the screen is very small.

 

[Cool_Breeze]

Looks quite similar to this:
LiPo LED Battery Voltage Checker Indicator Tester Meter | eBay

Price is good, wish they'd combine shipping, damn Chinese, oh well still cheaper than MV.

Has anyone yet found a deal for combined shipping..?

 

[TomCatt]

Has anyone yet found a deal for combined shipping..?

I've never heard of any; but would definitely be interested too!

 

[Cool_Breeze]

I've never heard of any; but would definitely be interested too!

I ordered 3 @ $3.38 each with free shipping...best I could find.

 

[gormly]

anyone know where could I pick up a female mini USB receptor so I could use a Male mini plug coming from a standard mini cable?

I want to make one of these for myself and would rather use a mini plug.
I found a step up regulator so I could use the USB port and still get 4-7V

also, I see that the OP used a wire nut for the pentometer rotary, is there something a little better than that?

Thanks

 

[TomCatt]

I'd check out eBay and Amazon for the usb jack.

Using a USB port directly off of your computer probably won't work too well; the max amps from ports on a computer are usually 0.5.

What step-up regulator did you get? From eBay? I got one of the LM2577 boost modules from eBay and wasn't able to get over 4.9V with a 3.2 carto. Another member here couldn't get over 3.3V with LR. These mods were with batteries; not sure what the results would be as a PT....hmmmm, something else to add to my list!

 

[gormly]

I'd check out eBay and Amazon for the usb jack.

Using a USB port directly off of your computer probably won't work too well; the max amps from ports on a computer are usually 0.5.

What step-up regulator did you get? From eBay? I got one of the LM2577 boost modules from eBay and wasn't able to get over 4.9V with a 3.2 carto. Another member here couldn't get over 3.3V with LR. These mods were with batteries; not sure what the results would be as a PT....hmmmm, something else to add to my list!

Yea, I was going to get that one, prolly look somewhere else then.
I didn't want to use a wall wart but I think I should based on what you just said.

thanks

opps. sorry for posting my sig, I forgot to uncheck the button..

 

[Youssefa]

Hi all,

Hope everyone is tightening their wallets for the holidays!!!..

I am new to modding and seing that I am building something very similar to what is showcased in this thread I thought that here is the place to ask...


My new mod is hopefully going to be a 3 power source 2 output VV mod. input is 2(wall adapter, 7.4-11.1v battery. output to either 510/901 atty or USB. When I started looking at switch onlne, there are all sorts of different acronyms...sdpdt, dpdt...etc. I have the fireing switch already. I need atleast one master slide switch on(ext bat/ac) off, on(int batt) and another to select between Att's or USB(on/on)can someone help me make since of this?

EDIT: What is the difference between "none" and "off"? SO confused