[SOLVED] 7107 Voltmeter Test

[amdixon]

Hi all,

I'm constructing a voltmeter with an adjustable power supply using a 7107 with 7 segment displays. Everything worked correctly on the breadboard. Now I'm soldering to a prototype board and connected all the pins (2-25) that output to the displays, but nothing else related to the voltmeter circuit. When I run pin 37 to +5V for a test, I get -1000 instead of the -1888 that the datasheet says I should get. All the segments in the displays work correctly when tested individually.

Is this normal when the rest of the voltmeter circuit is missing, or is it a sign that my 7107 could be faulty?

Thanks

 

[KlausST]

Hi,

Apparently you did something wrong (and different to the breadboard).
But we can't see what exactly you did.
So please show us your circuit.

Klaus

 

[amdixon]

That’s all there is to it at this point, just thought I’d test before adding the other components.

 

[KlausST]

Hi,

In this case I recommend to finish the wiring, at least the mandatory circuit according the datasheet.

Klaus

 

[amdixon]

Yes, it just needed all the complete circuit hooked up for the pin 37 test to work. The IC was fine and the voltmeter works correctly.

Thanks