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[SOLVED] 7107 Voltmeter Test

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amdixon

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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
 

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
 

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

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Hi,

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

Klaus
 

Solution
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
 

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  • AA07F6EC-F4FC-4448-A996-45E904740D74.jpeg
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