[SOLVED] 7107 Voltmeter Test

Status
Not open for further replies.
A

amdixon

Newbie
Joined
Mar 1, 2022
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
41
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
 

Sort by date Sort by votes
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
 

Upvote 0 Downvote
That’s all there is to it at this point, just thought I’d test before adding the other components.
 

Attachments

  • 20CC5E0E-51F3-4B9D-8323-A2148BC70893.jpeg
    1.8 MB · Views: 189

Upvote 0 Downvote
Hi,

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

Klaus
 

Upvote 0 Downvote
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
 

Attachments

  • AA07F6EC-F4FC-4448-A996-45E904740D74.jpeg
    1.9 MB · Views: 145

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…