Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Any ideas what the middle three contacts are? (12v Battery Voltimeter)

Status
Not open for further replies.

WastelandGuy

New Member
This is a 12v battery voltage indicator. Curious as to what the middle three "T" "GND" and "VCC" might do.
Anyone have any experience with these?
link:
**broken link removed**

Thanks!

s-l1600%202.jpg
0E9DCB99CD2616239E6DD22326CF33D29E335C9D53D253364399D2C96646CE9C36CFC6663DC89D2356F583%201.jpg
 
Gnd is ground, the 0 volt reference point in the circuit.

Vcc is the positive supply voltage for the circuit, probably 5 volts.

T, no idea.

Looking at the label on the side of the module, there are tick boxes for two types of module.
Maybe there is a connector fitted here on the other variant of the module.

JimB
 
It might relate to being a lower voltage Tap point for accesing it's own internal 5-volt rail that powers the driver IC's on the board.

I've found many small digital meters that have wide input range ratings to have taps like that to bypass the voltage regulators if an external 5-volt source is to be used if they are designed to sense the same voltage source they are powered from and that supply voltage goes below the minimum forward drop voltage of their onboard voltage regulator.

I've used that cheat a few times in applications with cheapo digital meters to make them work properly in other applications where they couldn't be powered off the same source they were reading from like they had been designed to do.
 
It might relate to being a lower voltage Tap point for accesing it's own internal 5-volt rail that powers the driver IC's on the board.
.
This is a very feasible assumption.
The assumption can be easily be verified, by applying voltage to the unit via its red and black wires, and then with an external DMM measure the voltage from Gnd to Vcc and T respectively.
 
The device is powered by Vcc-Gnd.
The measurement is T-Gnd.

This permits measuring a higher voltage the Vcc by using a Voltage Divider to feed T
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top